From 042ad5bfe898626c02c4583ce83a6a5d9c6dd47b Mon Sep 17 00:00:00 2001 From: "github-classroom[bot]" <66690702+github-classroom[bot]@users.noreply.github.com> Date: Sun, 28 Apr 2024 14:05:07 +0000 Subject: [PATCH 1/5] Update GitHub Classroom Autograding Workflow --- .github/workflows/classroom.yml | 223 ++++++++++++++++++++++++++++++-- 1 file changed, 212 insertions(+), 11 deletions(-) diff --git a/.github/workflows/classroom.yml b/.github/workflows/classroom.yml index dca83b024..8c4fa1b7e 100644 --- a/.github/workflows/classroom.yml +++ b/.github/workflows/classroom.yml @@ -1,19 +1,220 @@ -name: GitHub Classroom Workflow - -on: - - push - - workflow_dispatch - +name: Autograding Tests +'on': +- push +- workflow_dispatch +- repository_dispatch permissions: checks: write actions: read contents: read - jobs: - build: - name: Autograding + run-autograding-tests: runs-on: ubuntu-latest if: github.actor != 'github-classroom[bot]' steps: - - uses: actions/checkout@v4 - - uses: education/autograding@v1 + - name: Checkout code + uses: actions/checkout@v4 + - name: Step-1 Test + id: step-1-test + uses: education/autograding-command-grader@v1 + with: + test-name: Step-1 Test + setup-command: npm install + command: npm run test:1 + timeout: 10 + max-score: 10 + - name: Step-2 Test + id: step-2-test + uses: education/autograding-command-grader@v1 + with: + test-name: Step-2 Test + setup-command: npm install + command: npm run test:2 + timeout: 10 + max-score: 10 + - name: Step-3 Test + id: step-3-test + uses: education/autograding-command-grader@v1 + with: + test-name: Step-3 Test + setup-command: npm install + command: npm run test:3 + timeout: 10 + max-score: 10 + - name: Step-4 Test + id: step-4-test + uses: education/autograding-command-grader@v1 + with: + test-name: Step-4 Test + setup-command: npm install + command: npm run test:4 + timeout: 10 + - name: Step-5 Test + id: step-5-test + uses: education/autograding-command-grader@v1 + with: + test-name: Step-5 Test + setup-command: npm install + command: npm run test:5 + timeout: 10 + max-score: 10 + - name: Step-6 Test + id: step-6-test + uses: education/autograding-command-grader@v1 + with: + test-name: Step-6 Test + setup-command: npm install + command: npm run test:6 + timeout: 10 + max-score: 10 + - name: Step-7 Test + id: step-7-test + uses: education/autograding-command-grader@v1 + with: + test-name: Step-7 Test + setup-command: npm install + command: npm run test:7 + timeout: 10 + max-score: 10 + - name: Step-8 Test + id: step-8-test + uses: education/autograding-command-grader@v1 + with: + test-name: Step-8 Test + setup-command: npm install + command: npm run test:8 + timeout: 10 + max-score: 10 + - name: Step-9 Test + id: step-9-test + uses: education/autograding-command-grader@v1 + with: + test-name: Step-9 Test + setup-command: npm install + command: npm run test:9 + timeout: 10 + max-score: 10 + - name: Step-10 Test + id: step-10-test + uses: education/autograding-command-grader@v1 + with: + test-name: Step-10 Test + setup-command: npm install + command: npm run test:10 + timeout: 10 + max-score: 10 + - name: Step-11 Test + id: step-11-test + uses: education/autograding-command-grader@v1 + with: + test-name: Step-11 Test + setup-command: npm install + command: npm run test:11 + timeout: 10 + max-score: 10 + - name: Step-12 Test + id: step-12-test + uses: education/autograding-command-grader@v1 + with: + test-name: Step-12 Test + setup-command: npm install + command: npm run test:12 + timeout: 10 + max-score: 10 + - name: Step-13 Test + id: step-13-test + uses: education/autograding-command-grader@v1 + with: + test-name: Step-13 Test + setup-command: npm install + command: npm run test:13 + timeout: 10 + max-score: 10 + - name: Step-14 Test + id: step-14-test + uses: education/autograding-command-grader@v1 + with: + test-name: Step-14 Test + setup-command: npm install + command: npm run test:14 + timeout: 10 + max-score: 10 + - name: Step-15 Test + id: step-15-test + uses: education/autograding-command-grader@v1 + with: + test-name: Step-15 Test + setup-command: npm install + command: npm run test:15 + timeout: 10 + max-score: 10 + - name: Step-16 Test + id: step-16-test + uses: education/autograding-command-grader@v1 + with: + test-name: Step-16 Test + setup-command: npm install + command: npm run test:16 + timeout: 10 + max-score: 10 + - name: Step-17 Test + id: step-17-test + uses: education/autograding-command-grader@v1 + with: + test-name: Step-17 Test + setup-command: npm install + command: npm run test:17 + timeout: 10 + max-score: 10 + - name: Step-18 Test + id: step-18-test + uses: education/autograding-command-grader@v1 + with: + test-name: Step-18 Test + setup-command: npm install + command: npm run test:18 + timeout: 10 + max-score: 10 + - name: Step-19 Test + id: step-19-test + uses: education/autograding-command-grader@v1 + with: + test-name: Step-19 Test + setup-command: npm install + command: npm run test:19 + timeout: 10 + max-score: 10 + - name: Step-20 Test + id: step-20-test + uses: education/autograding-command-grader@v1 + with: + test-name: Step-20 Test + setup-command: npm install + command: npm run test:20 + timeout: 10 + max-score: 10 + - name: Autograding Reporter + uses: education/autograding-grading-reporter@v1 + env: + STEP-1-TEST_RESULTS: "${{steps.step-1-test.outputs.result}}" + STEP-2-TEST_RESULTS: "${{steps.step-2-test.outputs.result}}" + STEP-3-TEST_RESULTS: "${{steps.step-3-test.outputs.result}}" + STEP-4-TEST_RESULTS: "${{steps.step-4-test.outputs.result}}" + STEP-5-TEST_RESULTS: "${{steps.step-5-test.outputs.result}}" + STEP-6-TEST_RESULTS: "${{steps.step-6-test.outputs.result}}" + STEP-7-TEST_RESULTS: "${{steps.step-7-test.outputs.result}}" + STEP-8-TEST_RESULTS: "${{steps.step-8-test.outputs.result}}" + STEP-9-TEST_RESULTS: "${{steps.step-9-test.outputs.result}}" + STEP-10-TEST_RESULTS: "${{steps.step-10-test.outputs.result}}" + STEP-11-TEST_RESULTS: "${{steps.step-11-test.outputs.result}}" + STEP-12-TEST_RESULTS: "${{steps.step-12-test.outputs.result}}" + STEP-13-TEST_RESULTS: "${{steps.step-13-test.outputs.result}}" + STEP-14-TEST_RESULTS: "${{steps.step-14-test.outputs.result}}" + STEP-15-TEST_RESULTS: "${{steps.step-15-test.outputs.result}}" + STEP-16-TEST_RESULTS: "${{steps.step-16-test.outputs.result}}" + STEP-17-TEST_RESULTS: "${{steps.step-17-test.outputs.result}}" + STEP-18-TEST_RESULTS: "${{steps.step-18-test.outputs.result}}" + STEP-19-TEST_RESULTS: "${{steps.step-19-test.outputs.result}}" + STEP-20-TEST_RESULTS: "${{steps.step-20-test.outputs.result}}" + with: + runners: step-1-test,step-2-test,step-3-test,step-4-test,step-5-test,step-6-test,step-7-test,step-8-test,step-9-test,step-10-test,step-11-test,step-12-test,step-13-test,step-14-test,step-15-test,step-16-test,step-17-test,step-18-test,step-19-test,step-20-test From 065d7e20544692e17e528a252c0570cabf1d3db6 Mon Sep 17 00:00:00 2001 From: "github-classroom[bot]" <66690702+github-classroom[bot]@users.noreply.github.com> Date: Sun, 28 Apr 2024 14:05:07 +0000 Subject: [PATCH 2/5] GitHub Classroom Feedback --- .github/.keep | 0 1 file changed, 0 insertions(+), 0 deletions(-) create mode 100644 .github/.keep diff --git a/.github/.keep b/.github/.keep new file mode 100644 index 000000000..e69de29bb From 0511eaefb5cd7140f0a2c985489f26dd227a24e2 Mon Sep 17 00:00:00 2001 From: "github-classroom[bot]" <66690702+github-classroom[bot]@users.noreply.github.com> Date: Sun, 28 Apr 2024 14:05:08 +0000 Subject: [PATCH 3/5] Setting up GitHub Classroom Feedback From 7b47f935811679515b92d09e6e2d99129c9cdf87 Mon Sep 17 00:00:00 2001 From: "github-classroom[bot]" <66690702+github-classroom[bot]@users.noreply.github.com> Date: Sun, 28 Apr 2024 14:05:10 +0000 Subject: [PATCH 4/5] add online IDE url --- README.md | 1 + 1 file changed, 1 insertion(+) diff --git a/README.md b/README.md index eadfc715a..f54c810cd 100644 --- a/README.md +++ b/README.md @@ -1,3 +1,4 @@ +[![Open in Visual Studio Code](https://classroom.github.com/assets/open-in-vscode-718a45dd9cf7e7f842a935f5ebbe5719a5e09af4491e668f4dbf3b35d5cca122.svg)](https://classroom.github.com/online_ide?assignment_repo_id=14909790&assignment_repo_type=AssignmentRepo)

StylusDB SQL

A SQL database engine written in JavaScript From 3e09615a679b32670d06a018f3b407dbaa97ec79 Mon Sep 17 00:00:00 2001 From: Krish Gaur Date: Sun, 28 Apr 2024 19:58:58 +0530 Subject: [PATCH 5/5] tests --- enrollment.csv | 6 + package-lock.json | 4 +- package.json | 7 +- sample.csv | 4 + src/cli.js | 56 + src/csvReader.js | 71 ++ src/dev.js | 9 + src/index.js | 201 ++++ src/queryExecutor.js | 432 +++++++ src/queryParser.js | 187 +++ student.csv | 5 + tests/csvReader.test.js | 11 + tests/queryExecutor.test.js | 203 ++++ tests/queryParser.test.js | 217 ++++ tests/step-02/index.test.js | 18 +- tests/step-03/index.test.js | 42 +- tests/step-04/index.test.js | 59 +- tests/step-05/index.test.js | 104 +- tests/step-06/index.test.js | 161 ++- tests/step-07/index.test.js | 181 +-- tests/step-08/index.test.js | 295 +++-- tests/step-09/index.test.js | 342 +++--- tests/step-10/index.test.js | 1320 ++++++++++---------- tests/step-11/index.test.js | 1404 ++++++++++++---------- tests/step-12/index.test.js | 1488 ++++++++++++----------- tests/step-13/index.test.js | 1505 ++++++++++++----------- tests/step-14/index.test.js | 1599 +++++++++++++------------ tests/step-15/index.test.js | 1651 ++++++++++++++------------ tests/step-16/index.test.js | 1642 ++++++++++++------------- tests/step-17/index.test.js | 1649 ++++++++++++------------- tests/step-17/insertExecuter.test.js | 53 +- tests/step-18/deleteExecutor.test.js | 44 +- tests/step-18/index.test.js | 1651 ++++++++++++++------------ tests/step-18/insertExecuter.test.js | 51 +- tests/step-19/deleteExecutor.test.js | 44 +- tests/step-19/index.test.js | 1651 ++++++++++++++------------ tests/step-19/insertExecuter.test.js | 51 +- 37 files changed, 10376 insertions(+), 8042 deletions(-) create mode 100644 enrollment.csv create mode 100644 sample.csv create mode 100644 src/cli.js create mode 100644 src/dev.js create mode 100644 src/index.js create mode 100644 src/queryExecutor.js create mode 100644 src/queryParser.js create mode 100644 student.csv create mode 100644 tests/csvReader.test.js create mode 100644 tests/queryExecutor.test.js create mode 100644 tests/queryParser.test.js diff --git a/enrollment.csv b/enrollment.csv new file mode 100644 index 000000000..e80af8d93 --- /dev/null +++ b/enrollment.csv @@ -0,0 +1,6 @@ +student_id,course +1,Mathematics +1,Physics +2,Chemistry +3,Mathematics +5,Biology \ No newline at end of file diff --git a/package-lock.json b/package-lock.json index 3afaec37f..a6ba782df 100644 --- a/package-lock.json +++ b/package-lock.json @@ -9,7 +9,6 @@ "version": "0.1.6", "license": "ISC", "dependencies": { - "csv-parser": "^3.0.0", "json2csv": "^6.0.0-alpha.2", "xterm": "^5.3.0" }, @@ -17,6 +16,7 @@ "stylusdb-cli": "node ./src/cli.js" }, "devDependencies": { + "csv-parser": "^3.0.0", "jest": "^29.7.0" } }, @@ -1573,6 +1573,7 @@ "version": "3.0.0", "resolved": "https://registry.npmjs.org/csv-parser/-/csv-parser-3.0.0.tgz", "integrity": "sha512-s6OYSXAK3IdKqYO33y09jhypG/bSDHPuyCme/IdEHfWpLf/jKcpitVFyOC6UemgGk8v7Q5u2XE0vvwmanxhGlQ==", + "dev": true, "dependencies": { "minimist": "^1.2.0" }, @@ -2943,6 +2944,7 @@ "version": "1.2.8", "resolved": "https://registry.npmjs.org/minimist/-/minimist-1.2.8.tgz", "integrity": "sha512-2yyAR8qBkN3YuheJanUpWC5U3bb5osDywNB8RzDVlDwDHbocAJveqqj1u8+SVD7jkWT4yvsHCpWqqWqAxb0zCA==", + "dev": true, "funding": { "url": "https://github.com/sponsors/ljharb" } diff --git a/package.json b/package.json index f52103d5c..d2b9c2349 100644 --- a/package.json +++ b/package.json @@ -4,7 +4,8 @@ "description": "A minimal SQL based DB based on CSV files. For educational purposes only.", "main": "./src/index.js", "directories": { - "doc": "docs" + "doc": "docs", + "test": "tests" }, "scripts": { "test": "jest", @@ -38,11 +39,11 @@ "author": "Chakshu Gautam", "license": "ISC", "devDependencies": { + "csv-parser": "^3.0.0", "jest": "^29.7.0" }, "dependencies": { - "csv-parser": "^3.0.0", "json2csv": "^6.0.0-alpha.2", "xterm": "^5.3.0" } -} \ No newline at end of file +} diff --git a/sample.csv b/sample.csv new file mode 100644 index 000000000..9e7a9fa25 --- /dev/null +++ b/sample.csv @@ -0,0 +1,4 @@ +id,name,age +1,John,30 +2,Jane,25 +3,Bob,22 \ No newline at end of file diff --git a/src/cli.js b/src/cli.js new file mode 100644 index 000000000..145dfd887 --- /dev/null +++ b/src/cli.js @@ -0,0 +1,56 @@ +#!/usr/bin/env node + +const readline = require("readline"); +const { + executeSELECTQuery, + executeINSERTQuery, + executeDELETEQuery, +} = require("./queryExecutor"); + +const rl = readline.createInterface({ + input: process.stdin, + output: process.stdout, +}); + +rl.setPrompt("SQL> "); +console.log( + 'SQL Query Engine CLI. Enter your SQL commands, or type "exit" to quit.' +); + +rl.prompt(); + +rl.on("line", async (line) => { + if (line.toLowerCase() === "exit") { + rl.close(); + return; + } + + try { + const queryRegex = /^(\S+)/; + const queryMatch = line.match(queryRegex); + + if (queryMatch) { + const [, action] = queryMatch; + console.log(action); + switch (action.toUpperCase()) { + case "SELECT": + await executeSELECTQuery(line); + case "DELETE": + await executeDELETEQuery(line); + case "INSERT": + await executeINSERTQuery(line); + default: + throw new Error(`Invalid query action : ${action} `); + } + } else { + throw new Error("Please enter a valid query string"); + } + } catch (error) { + console.error("Error:", error.message); + } + + rl.prompt(); +}).on("close", () => { + console.log("Exiting SQL CLI"); + process.exit(0); +}); diff --git a/src/csvReader.js b/src/csvReader.js index e69de29bb..bdd2eae70 100644 --- a/src/csvReader.js +++ b/src/csvReader.js @@ -0,0 +1,71 @@ +const fs = require("fs"); +const csv = require("csv-parser"); + +// Helper function to convert data +function convertData(data) { + let writeContent = ""; + let rowsInserted = 0; + + data.forEach((row) => { + for (const key in row) { + writeContent += `${row[key]},`; + } + writeContent = writeContent.slice(0, -1); + writeContent += "\n"; + rowsInserted += 1; + }); + + return { writeContent, rowsInserted }; +} + +function readCSV(filePath) { + const results = []; + + return new Promise((resolve, reject) => { + fs.createReadStream(filePath) + .pipe(csv()) + .on("data", (data) => { + results.push(data); + }) + .on("end", () => { + resolve(results); + }) + .on("error", (error) => { + reject(error); + }); + }); +} + +async function writeCSV(filePath, data) { + const { writeContent, rowsInserted } = convertData(data); + + let fields = ""; + + for (const key in data[0]) { + fields += `${key},`; + } + fields = fields.slice(0, -1); + fields += "\n" + writeContent; + + fs.writeFile(filePath, fields, (err) => { + if (err) { + console.error(err); + } else { + } + }); +} + +async function updateCSV(filePath, data) { + const { writeContent, rowsInserted } = convertData(data); + + fs.appendFile(filePath, writeContent, (err) => { + if (err) { + console.error(err); + } else { + } + }); + + return { rowsInserted }; +} + +module.exports = { readCSV, writeCSV, updateCSV }; diff --git a/src/dev.js b/src/dev.js new file mode 100644 index 000000000..b1e0240cf --- /dev/null +++ b/src/dev.js @@ -0,0 +1,9 @@ +const { executeDELETEQuery } = require("./queryExecutor"); +const { parseINSERTQuery } = require("./queryParser"); +const { readCSV, writeCSV } = require("./csvReader"); + +const SQL_QUERY = "DELETE FROM courses WHERE course_id = '2'"; + +executeDELETEQuery(SQL_QUERY).then((data) => { + console.log("Query Executed", data); +}); diff --git a/src/index.js b/src/index.js new file mode 100644 index 000000000..e78a744e1 --- /dev/null +++ b/src/index.js @@ -0,0 +1,201 @@ +const { parseQuery } = require("./queryParser"); +const readCSV = require("./csvReader"); + +function performInnerJoin(data, joinData, joinCondition, fields, table) { + return data.flatMap((mainRow) => { + return joinData + .filter((joinRow) => { + const mainValue = mainRow[joinCondition.left.split(".")[1]]; + const joinValue = joinRow[joinCondition.right.split(".")[1]]; + return mainValue === joinValue; + }) + .map((joinRow) => { + return fields.reduce((acc, field) => { + const [tableName, fieldName] = field.split("."); + acc[field] = + tableName === table ? mainRow[fieldName] : joinRow[fieldName]; + return acc; + }, {}); + }); + }); +} + +function performLeftJoin(data, joinData, joinCondition, fields, table) { + return data.flatMap((mainRow) => { + const matchingJoinRows = joinData.filter((joinRow) => { + const mainValue = getValueFromRow(mainRow, joinCondition.left); + const joinValue = getValueFromRow(joinRow, joinCondition.right); + return mainValue === joinValue; + }); + + if (matchingJoinRows.length === 0) { + return [createResultRow(mainRow, null, fields, table, true)]; + } + + return matchingJoinRows.map((joinRow) => + createResultRow(mainRow, joinRow, fields, table, true) + ); + }); +} + +function getValueFromRow(row, compoundFieldName) { + const [tableName, fieldName] = compoundFieldName.split("."); + return row[`${tableName}.${fieldName}`] || row[fieldName]; +} + +function performRightJoin(data, joinData, joinCondition, fields, table) { + // Cache the structure of a main table row (keys only) + const mainTableRowStructure = + data.length > 0 + ? Object.keys(data[0]).reduce((acc, key) => { + acc[key] = null; // Set all values to null initially + return acc; + }, {}) + : {}; + + return joinData.map((joinRow) => { + const mainRowMatch = data.find((mainRow) => { + const mainValue = getValueFromRow(mainRow, joinCondition.left); + const joinValue = getValueFromRow(joinRow, joinCondition.right); + return mainValue === joinValue; + }); + + // Use the cached structure if no match is found + const mainRowToUse = mainRowMatch || mainTableRowStructure; + + // Include all necessary fields from the 'student' table + return createResultRow(mainRowToUse, joinRow, fields, table, true); + }); +} + +function createResultRow( + mainRow, + joinRow, + fields, + table, + includeAllMainFields +) { + const resultRow = {}; + + if (includeAllMainFields) { + // Include all fields from the main table + Object.keys(mainRow || {}).forEach((key) => { + const prefixedKey = `${table}.${key}`; + resultRow[prefixedKey] = mainRow ? mainRow[key] : null; + }); + } + + // Now, add or overwrite with the fields specified in the query + fields.forEach((field) => { + const [tableName, fieldName] = field.includes(".") + ? field.split(".") + : [table, field]; + resultRow[field] = + tableName === table && mainRow + ? mainRow[fieldName] + : joinRow + ? joinRow[fieldName] + : null; + }); + + return resultRow; +} + +async function executeSELECTQuery(query) { + const { fields, table, whereClauses, joinType, joinTable, joinCondition } = + parseQuery(query); + let data = await readCSV(`${table}.csv`); + + // Perform INNER JOIN if specified + if (joinTable && joinCondition) { + const joinData = await readCSV(`${joinTable}.csv`); + switch (joinType.toUpperCase()) { + case "INNER": + data = performInnerJoin(data, joinData, joinCondition, fields, table); + break; + case "LEFT": + data = performLeftJoin(data, joinData, joinCondition, fields, table); + break; + case "RIGHT": + data = performRightJoin(data, joinData, joinCondition, fields, table); + break; + default: + throw new Error(`Unsupported JOIN type: ${joinType}`); + } + } + + console.log("AFTER JOIN", data); + console.log("WHERE CLAUSES", whereClauses); + // Apply WHERE clause filtering after JOIN (or on the original data if no join) + const filteredData = + whereClauses.length > 0 + ? data.filter((row) => + whereClauses.every((clause) => evaluateCondition(row, clause)) + ) + : data; + + // console.log("AFTER WHERE", filteredData); + + // Select the specified fields + return filteredData.map((row) => { + const selectedRow = {}; + }); +} + +function evaluateCondition(row, clause) { + let { field, operator, value } = clause; + + // Check if the field exists in the row + if (row[field] === undefined) { + throw new Error(`Invalid field: ${field}`); + } + + // Parse row value and condition value based on their actual types + const rowValue = parseValue(row[field]); + let conditionValue = parseValue(value); + + // console.log("EVALUATING", rowValue, operator, conditionValue, typeof (rowValue), typeof (conditionValue)); + + switch (operator) { + case "=": + return rowValue === conditionValue; + case "!=": + return rowValue !== conditionValue; + case ">": + return rowValue > conditionValue; + case "<": + return rowValue < conditionValue; + case ">=": + return rowValue >= conditionValue; + case "<=": + return rowValue <= conditionValue; + default: + throw new Error(`Unsupported operator: $(operator)`); + } +} + +// Helper function to parse value based on its apparent type +function parseValue(value) { + // Return null or undefined as is + if (value === null || value === undefined) { + return value; + } + + // If the value is a string enclosed in single or double quotes, remove them + if ( + typeof value === "string" && + ((value.startsWith("'") && value.endsWith("'")) || + (value.startsWith('"') && value.endsWith('"'))) + ) { + value = value.substring(1, value.length - 1); + } + + // Check if value is a number + if (!isNaN(value) && value.trim() !== "") { + return Number(value); + } + // Assume value is a string if not a number + return value; +} + +module.exports = executeSELECTQuery; diff --git a/src/queryExecutor.js b/src/queryExecutor.js new file mode 100644 index 000000000..b825ac2c9 --- /dev/null +++ b/src/queryExecutor.js @@ -0,0 +1,432 @@ +const { + parseSelectQuery, + parseInsertQuery, + parseDeleteQuery, +} = require("./queryParser"); +const { readCSV, writeCSV, updateCSV } = require("./csvReader"); + +function performInnerJoin(data, joinData, joinCondition, fields, table) { + return data.flatMap((mainRow) => { + return joinData + .filter((joinRow) => { + const mainValue = mainRow[joinCondition.left.split(".")[1]]; + const joinValue = joinRow[joinCondition.right.split(".")[1]]; + return mainValue === joinValue; + }) + .map((joinRow) => { + return fields.reduce((acc, field) => { + const [tableName, fieldName] = field.split("."); + acc[field] = + tableName === table ? mainRow[fieldName] : joinRow[fieldName]; + return acc; + }, {}); + }); + }); +} + +function performLeftJoin(data, joinData, joinCondition, fields, table) { + return data.flatMap((mainRow) => { + const matchingJoinRows = joinData.filter((joinRow) => { + const mainValue = getValueFromRow(mainRow, joinCondition.left); + const joinValue = getValueFromRow(joinRow, joinCondition.right); + return mainValue === joinValue; + }); + + if (matchingJoinRows.length === 0) { + return [createResultRow(mainRow, null, fields, table, true)]; + } + + return matchingJoinRows.map((joinRow) => + createResultRow(mainRow, joinRow, fields, table, true) + ); + }); +} + +function getValueFromRow(row, compoundFieldName) { + const [tableName, fieldName] = compoundFieldName.split("."); + return row[`${tableName}.${fieldName}`] || row[fieldName]; +} + +function performRightJoin(data, joinData, joinCondition, fields, table) { + // Cache the structure of a main table row (keys only) + const mainTableRowStructure = + data.length > 0 + ? Object.keys(data[0]).reduce((acc, key) => { + acc[key] = null; // Set all values to null initially + return acc; + }, {}) + : {}; + + return joinData.map((joinRow) => { + const mainRowMatch = data.find((mainRow) => { + const mainValue = getValueFromRow(mainRow, joinCondition.left); + const joinValue = getValueFromRow(joinRow, joinCondition.right); + return mainValue === joinValue; + }); + + // Use the cached structure if no match is found + const mainRowToUse = mainRowMatch || mainTableRowStructure; + + // Include all necessary fields from the 'student' table + return createResultRow(mainRowToUse, joinRow, fields, table, true); + }); +} + +function createResultRow( + mainRow, + joinRow, + fields, + table, + includeAllMainFields +) { + const resultRow = {}; + + if (includeAllMainFields) { + // Include all fields from the main table + Object.keys(mainRow || {}).forEach((key) => { + const prefixedKey = `${table}.${key}`; + resultRow[prefixedKey] = mainRow ? mainRow[key] : null; + }); + } + + // Now, add or overwrite with the fields specified in the query + fields.forEach((field) => { + const [tableName, fieldName] = field.includes(".") + ? field.split(".") + : [table, field]; + resultRow[field] = + tableName === table && mainRow + ? mainRow[fieldName] + : joinRow + ? joinRow[fieldName] + : null; + }); + + return resultRow; +} + +function evaluateCondition(row, clause) { + let { field, operator, value } = clause; + + // Check if the field exists in the row + if (row[field] === undefined) { + throw new Error(`Invalid field: ${field}`); + } + + // Parse row value and condition value based on their actual types + const rowValue = parseValue(row[field]); + let conditionValue = parseValue(value); + + switch (operator) { + case "=": + return rowValue === conditionValue; + case "!=": + return rowValue !== conditionValue; + case ">": + return rowValue > conditionValue; + case "<": + return rowValue < conditionValue; + case ">=": + return rowValue >= conditionValue; + case "<=": + return rowValue <= conditionValue; + case "LIKE": + const regexPattern = "^" + value.slice(1, -1).replace(/%/g, ".*") + "$"; + return new RegExp(regexPattern, "i").test(row[field]); + default: + throw new Error(`Unsupported operator: ${operator}`); + } +} + +// Helper function to parse value based on its apparent type +function parseValue(value) { + // Return null or undefined as is + if (value === null || value === undefined) { + return value; + } + + // If the value is a string enclosed in single or double quotes, remove them + if ( + typeof value === "string" && + ((value.startsWith("'") && value.endsWith("'")) || + (value.startsWith('"') && value.endsWith('"'))) + ) { + value = value.substring(1, value.length - 1); + } + + // Check if value is a number + if (!isNaN(value) && value.trim() !== "") { + return Number(value); + } + // Assume value is a string if not a number + return value; +} + +// Helper function to map columsn to values +function mapColumnsToValues(columns, values) { + const mappedObjects = []; + const numColumns = columns.length; + const numValues = values.length; + + // Ensure values are divisible by the number of columns + if (numValues % numColumns !== 0) { + throw new Error("Number of values does not match the number of columns."); + } + + // Iterate through each set of values + for (let i = 0; i < numValues; i += numColumns) { + const mappedObject = {}; + + // Map columns to values for the current set + for (let j = 0; j < numColumns; j++) { + const columnName = columns[j].trim(); + const columnIndex = i + j; + const columnValue = values[columnIndex].replace(/'/g, ""); // Remove single quotes + mappedObject[columnName] = columnValue; + } + + mappedObjects.push(mappedObject); + } + + return mappedObjects; +} + +function applyGroupBy(data, groupByFields, aggregateFunctions) { + const groupResults = {}; + + data.forEach((row) => { + // Generate a key for the group + const groupKey = groupByFields.map((field) => row[field]).join("-"); + + // Initialize group in results if it doesn't exist + if (!groupResults[groupKey]) { + groupResults[groupKey] = { count: 0, sums: {}, mins: {}, maxes: {} }; + groupByFields.forEach( + (field) => (groupResults[groupKey][field] = row[field]) + ); + } + + // Aggregate calculations + groupResults[groupKey].count += 1; + aggregateFunctions.forEach((func) => { + const match = /(\w+)\((\w+)\)/.exec(func); + if (match) { + const [, aggFunc, aggField] = match; + const value = parseFloat(row[aggField]); + + switch (aggFunc.toUpperCase()) { + case "SUM": + groupResults[groupKey].sums[aggField] = + (groupResults[groupKey].sums[aggField] || 0) + value; + break; + case "MIN": + groupResults[groupKey].mins[aggField] = Math.min( + groupResults[groupKey].mins[aggField] || value, + value + ); + break; + case "MAX": + groupResults[groupKey].maxes[aggField] = Math.max( + groupResults[groupKey].maxes[aggField] || value, + value + ); + break; + // Additional aggregate functions can be added here + } + } + }); + }); + + // Convert grouped results into an array format + return Object.values(groupResults).map((group) => { + // Construct the final grouped object based on required fields + const finalGroup = {}; + groupByFields.forEach((field) => (finalGroup[field] = group[field])); + aggregateFunctions.forEach((func) => { + const match = /(\w+)\((\*|\w+)\)/.exec(func); + if (match) { + const [, aggFunc, aggField] = match; + switch (aggFunc.toUpperCase()) { + case "SUM": + finalGroup[func] = group.sums[aggField]; + break; + case "MIN": + finalGroup[func] = group.mins[aggField]; + break; + case "MAX": + finalGroup[func] = group.maxes[aggField]; + break; + case "COUNT": + finalGroup[func] = group.count; + break; + // Additional aggregate functions can be handled here + } + } + }); + + return finalGroup; + }); +} + +async function executeSELECTQuery(query) { + try { + const { + fields, + table, + whereClauses, + joinType, + joinTable, + joinCondition, + groupByFields, + hasAggregateWithoutGroupBy, + orderByFields, + limit, + isDistinct, + } = parseSelectQuery(query); + let data = await readCSV(`${table}.csv`); + + // Perform INNER JOIN if specified + if (joinTable && joinCondition) { + const joinData = await readCSV(`${joinTable}.csv`); + switch (joinType.toUpperCase()) { + case "INNER": + data = performInnerJoin(data, joinData, joinCondition, fields, table); + break; + case "LEFT": + data = performLeftJoin(data, joinData, joinCondition, fields, table); + break; + case "RIGHT": + data = performRightJoin(data, joinData, joinCondition, fields, table); + break; + default: + throw new Error(`Unsupported JOIN type: ${joinType}`); + } + } + // Apply WHERE clause filtering after JOIN (or on the original data if no join) + data = + whereClauses.length > 0 + ? data.filter((row) => + whereClauses.every((clause) => evaluateCondition(row, clause)) + ) + : data; + + let groupResults = data; + + if (hasAggregateWithoutGroupBy) { + // Special handling for queries like 'SELECT COUNT(*) FROM table' + const result = {}; + + fields.forEach((field) => { + const match = /(\w+)\((\*|\w+)\)/.exec(field); + if (match) { + const [, aggFunc, aggField] = match; + switch (aggFunc.toUpperCase()) { + case "COUNT": + result[field] = data.length; + break; + case "SUM": + result[field] = data.reduce( + (acc, row) => acc + parseFloat(row[aggField]), + 0 + ); + break; + case "AVG": + result[field] = + data.reduce((acc, row) => acc + parseFloat(row[aggField]), 0) / + data.length; + break; + case "MIN": + result[field] = Math.min( + ...data.map((row) => parseFloat(row[aggField])) + ); + break; + case "MAX": + result[field] = Math.max( + ...data.map((row) => parseFloat(row[aggField])) + ); + break; + // Additional aggregate functions can be handled here + } + } + }); + + data = [result]; + // Add more cases here if needed for other aggregates + } else if (groupByFields) { + groupResults = applyGroupBy(data, groupByFields, fields); + data = groupResults; + } + + if (orderByFields) { + for (let { fieldName, order } of orderByFields) { + data.sort((a, b) => { + if (a[fieldName] < b[fieldName]) return order === "ASC" ? -1 : 1; + if (a[fieldName] > b[fieldName]) return order === "ASC" ? 1 : -1; + }); + } + } + + // Select the specified fields + data = data.map((row) => { + const selectedRow = {}; + fields.forEach((field) => { + // Assuming 'field' is just the column name without table prefix + selectedRow[field] = row[field]; + }); + return selectedRow; + }); + + // LIMIT Clause + if (limit !== null) { + data = data.slice(0, limit); + } + // DISTINCT Clause + if (isDistinct) { + data = [ + ...new Map( + data.map((item) => [ + fields.map((field) => item[field]).join("|"), + item, + ]) + ).values(), + ]; + } + + return data; + } catch (error) { + console.error("Error executing query:", error); + throw new Error(`Error executing query: ${error.message}`); + } +} + +async function executeINSERTQuery(query) { + const { type, table, columns, values } = parseInsertQuery(query); + + const writeData = mapColumnsToValues(columns, values); + + return await updateCSV(`${table}.csv`, writeData); +} + +async function executeDELETEQuery(query) { + const { table, whereClauses } = parseDeleteQuery(query); + let data = await readCSV(`${table}.csv`); + console.log(data); + if (whereClauses.length > 0) { + // Filter out the rows that meet the where clause conditions + + data = data.filter( + (row) => !whereClauses.every((clause) => evaluateCondition(row, clause)) + ); + console.log(data); + } else { + // If no where clause, clear the entire table + data = []; + } + + // Save the updated data back to the CSV file + await writeCSV(`${table}.csv`, data); + + return { message: "Rows deleted successfully." }; +} + +module.exports = { executeSELECTQuery, executeINSERTQuery, executeDELETEQuery }; diff --git a/src/queryParser.js b/src/queryParser.js new file mode 100644 index 000000000..ecbf841f0 --- /dev/null +++ b/src/queryParser.js @@ -0,0 +1,187 @@ +function parseSelectQuery(query) { + try { + query = query.trim(); + let isDistinct = false; + if (query.toUpperCase().includes("SELECT DISTINCT")) { + isDistinct = true; + query = query.replace("SELECT DISTINCT", "SELECT"); + } + + // Split the Query by LIMIT clause + const limitSplit = query.split(/\sLIMIT\s/i); + const queryWithoutlimit = limitSplit[0]; + + let limit = limitSplit.length > 1 ? parseInt(limitSplit[1].trim()) : null; + + // Split the Query st ORDER BY clause + const orderBySplit = queryWithoutlimit.split(/\sORDER BY\s/i); + const queryWithoutOrderBy = orderBySplit[0]; + + let orderByFields = + orderBySplit.length > 1 + ? orderBySplit[1] + .trim() + .split(",") + .map((field) => { + const [fieldName, order] = field.trim().split(/\s+/); + return { fieldName, order: order ? order.toUpperCase() : "ASC" }; + }) + : null; + + // Split the query at the GROUP BY clause if it exists + const groupBySplit = queryWithoutOrderBy.split(/\sGROUP BY\s/i); + const queryWithoutGroupBy = groupBySplit[0]; // Everything before GROUP BY clause + + // GROUP BY clause is the second part after splitting, if it exists + let groupByFields = + groupBySplit.length > 1 + ? groupBySplit[1] + .trim() + .split(",") + .map((field) => field.trim()) + : null; + + // Split the query at the WHERE clause if it exists + const whereSplit = queryWithoutGroupBy.split(/\sWHERE\s/i); + const queryWithoutWhere = whereSplit[0]; // Everything before WHERE clause + + // WHERE clause is the second part after splitting, if it exists + const whereClause = whereSplit.length > 1 ? whereSplit[1].trim() : null; + + // Split the remaining query at the JOIN clause if it exists + const joinSplit = queryWithoutWhere.split(/\s(INNER|LEFT|RIGHT) JOIN\s/i); + + const selectPart = joinSplit[0].trim(); // Everything before JOIN clause + + // Parse the SELECT part + const selectRegex = /^SELECT\s(.+?)\sFROM\s(.+)/i; + const selectMatch = selectPart.match(selectRegex); + + if (!selectMatch) { + throw new Error( + "Error executing query: Query parsing error: Invalid SELECT format" + ); + } + + const [, fields, table] = selectMatch; + + // Extract JOIN information + const { joinType, joinTable, joinCondition } = + parseJoinClause(queryWithoutWhere); + + // Parse the WHERE part if it exists + let whereClauses = []; + if (whereClause) { + whereClauses = parseWhereClause(whereClause); + } + + // Check for the presence of aggregate functions without GROUP BY + const aggregateFunctionRegex = + /(\bCOUNT\b|\bAVG\b|\bSUM\b|\bMIN\b|\bMAX\b)\s*\(\s*(\*|\w+)\s*\)/i; + const hasAggregateWithoutGroupBy = + aggregateFunctionRegex.test(query) && !groupByFields; + + return { + fields: fields.split(",").map((field) => field.trim()), + table: table.trim(), + whereClauses, + joinType, + joinTable, + joinCondition, + groupByFields, + hasAggregateWithoutGroupBy, + orderByFields, + limit, + isDistinct, + }; + } catch (error) { + console.log(error); + throw new Error(`Query parsing error: ${error.message}`); + } +} + +function parseInsertQuery(query) { + const insertRegex = /INSERT INTO (\w+)\s*\(([^)]+)\)\s*VALUES\s*\(([^)]+)\)/; + + const inserMatch = query.match(insertRegex); + + if (inserMatch) { + const [, table, columns, values] = inserMatch; + const columnList = columns.split(",").map((field) => field.trim()); + const valueList = values.match(/'([^']+)'/g).map((val) => val); + + return (result = { + type: "INSERT", + table: table.trim(), + columns: columnList, + values: valueList, + }); + } else { + console.log("No match found"); + throw new Error("Query Parsing Error : INSERT Query has inavlid format."); + } +} + +function parseDeleteQuery(query) { + const deleteRegex = /DELETE FROM\s+(\w+)\s+WHERE\s+(.+)/; + const deleteMatch = query.match(deleteRegex); + + if (deleteMatch) { + const [, table, whereString] = deleteMatch; + const whereClauses = parseWhereClause(whereString); + + return { + type: "DELETE", + table, + whereClauses, + }; + } else { + throw new Error("Query Parsing Error: Invalid DELETE format"); + } +} + +function parseWhereClause(whereString) { + const conditionRegex = /(.*?)(=|!=|>|<|>=|<=)(.*)/; + return whereString.split(/ AND | OR /i).map((conditionString) => { + if (conditionString.includes("LIKE")) { + const [field, pattern] = conditionString.split(/\sLIKE\s/i); + return { field: field.trim(), operator: "LIKE", value: pattern.trim() }; + } + const match = conditionString.match(conditionRegex); + if (match) { + const [, field, operator, value] = match; + return { field: field.trim(), operator, value: value.trim() }; + } + throw new Error("Invalid WHERE clause format"); + }); +} + +function parseJoinClause(query) { + const joinRegex = + /\s(INNER|LEFT|RIGHT) JOIN\s(.+?)\sON\s([\w.]+)\s*=\s*([\w.]+)/i; + const joinMatch = query.match(joinRegex); + + if (joinMatch) { + return { + joinType: joinMatch[1].trim(), + joinTable: joinMatch[2].trim(), + joinCondition: { + left: joinMatch[3].trim(), + right: joinMatch[4].trim(), + }, + }; + } + + return { + joinType: null, + joinTable: null, + joinCondition: null, + }; +} + +module.exports = { + parseSelectQuery, + parseJoinClause, + parseInsertQuery, + parseDeleteQuery, +}; diff --git a/student.csv b/student.csv new file mode 100644 index 000000000..e9c960121 --- /dev/null +++ b/student.csv @@ -0,0 +1,5 @@ +id,name,age +1,John,30 +2,Jane,25 +3,Bob,22 +4,Alice,24 \ No newline at end of file diff --git a/tests/csvReader.test.js b/tests/csvReader.test.js new file mode 100644 index 000000000..2379ed13d --- /dev/null +++ b/tests/csvReader.test.js @@ -0,0 +1,11 @@ +const readCSV = require("../src/csvReader"); +const { parseQuery } = require("../src/queryParser"); +const executeSELECTQuery = require("../src/index"); + +test("Read CSV File", async () => { + const data = await readCSV("./student.csv"); + expect(data.length).toBeGreaterThan(0); + expect(data.length).toBe(4); + expect(data[0].name).toBe("John"); + expect(data[0].age).toBe("30"); //ignore the string type here, we will fix this later +}); diff --git a/tests/queryExecutor.test.js b/tests/queryExecutor.test.js new file mode 100644 index 000000000..bdd038fbe --- /dev/null +++ b/tests/queryExecutor.test.js @@ -0,0 +1,203 @@ +const readCSV = require("../src/csvReader"); +const { parseQuery } = require("../src/queryParser"); +const executeSELECTQuery = require("../src/index"); + +test("Execute SQL Query", async () => { + const query = "SELECT id, name FROM student"; + const result = await executeSELECTQuery(query); + expect(result.length).toBeGreaterThan(0); + expect(result[0]).toHaveProperty("id"); + expect(result[0]).toHaveProperty("name"); + expect(result[0]).not.toHaveProperty("age"); + expect(result[0]).toEqual({ id: "1", name: "John" }); +}); + +test("Execute SQL Query with WHERE Clause", async () => { + const query = "SELECT id, name FROM student WHERE age = 25"; + const result = await executeSELECTQuery(query); + expect(result.length).toBe(1); + expect(result[0]).toHaveProperty("id"); + expect(result[0]).toHaveProperty("name"); + expect(result[0].id).toBe("2"); +}); + +test("Execute SQL Query with Complex WHERE Clause", async () => { + const query = "SELECT id, name FROM student WHERE age = 30 AND name = John"; + const result = await executeSELECTQuery(query); + expect(result.length).toBe(1); + expect(result[0]).toEqual({ id: "1", name: "John" }); +}); + +test("Execute SQL Query with Greater Than", async () => { + const queryWithGT = "SELECT id FROM student WHERE age > 22"; + const result = await executeSELECTQuery(queryWithGT); + expect(result.length).toEqual(3); + expect(result[0]).toHaveProperty("id"); +}); + +test("Execute SQL Query with Not Equal to", async () => { + const queryWithGT = "SELECT name FROM student WHERE age != 25"; + const result = await executeSELECTQuery(queryWithGT); + expect(result.length).toEqual(3); + expect(result[0]).toHaveProperty("name"); +}); + +test("Execute SQL Query with INNER JOIN", async () => { + const query = + "SELECT student.name, enrollment.course FROM student INNER JOIN enrollment ON student.id=enrollment.student_id"; + const result = await executeSELECTQuery(query); + /* + result = [ + { 'student.name': 'John', 'enrollment.course': 'Mathematics' }, + { 'student.name': 'John', 'enrollment.course': 'Physics' }, + { 'student.name': 'Jane', 'enrollment.course': 'Chemistry' }, + { 'student.name': 'Bob', 'enrollment.course': 'Mathematics' } + ] + */ + expect(result.length).toEqual(4); + // toHaveProperty is not working here due to dot in the property name + expect(result[0]).toEqual( + expect.objectContaining({ + "enrollment.course": "Mathematics", + "student.name": "John", + }) + ); +}); + +test("Execute SQL Query with INNER JOIN and a WHERE Clause", async () => { + const query = + "SELECT student.name, enrollment.course, student.age FROM student INNER JOIN enrollment ON student.id = enrollment.student_id WHERE student.age > 25"; + const result = await executeSELECTQuery(query); + /* + result = [ + { + 'student.name': 'John', + 'enrollment.course': 'Mathematics', + 'student.age': '30' + }, + { + 'student.name': 'John', + 'enrollment.course': 'Physics', + 'student.age': '30' + } + ] + */ + expect(result.length).toEqual(2); + // toHaveProperty is not working here due to dot in the property name + expect(result[0]).toEqual( + expect.objectContaining({ + "enrollment.course": "Mathematics", + "student.name": "John", + }) + ); +}); + +test("Execute SQL Query with LEFT JOIN", async () => { + const query = + "SELECT student.name, enrollment.course FROM student LEFT JOIN enrollment ON student.id=enrollment.student_id"; + const result = await executeSELECTQuery(query); + expect(result).toEqual( + expect.arrayContaining([ + expect.objectContaining({ + "student.name": "Alice", + "enrollment.course": null, + }), + expect.objectContaining({ + "student.name": "John", + "enrollment.course": "Mathematics", + }), + ]) + ); + expect(result.length).toEqual(5); // 4 students, but John appears twice +}); + +test("Execute SQL Query with RIGHT JOIN", async () => { + const query = + "SELECT student.name, enrollment.course FROM student RIGHT JOIN enrollment ON student.id=enrollment.student_id"; + const result = await executeSELECTQuery(query); + expect(result).toEqual( + expect.arrayContaining([ + expect.objectContaining({ + "student.name": null, + "enrollment.course": "Biology", + }), + expect.objectContaining({ + "student.name": "John", + "enrollment.course": "Mathematics", + }), + ]) + ); + expect(result.length).toEqual(5); // 4 courses, but Mathematics appears twice +}); + +test("Execute SQL Query with LEFT JOIN with a WHERE clause filtering the main table", async () => { + const query = + "SELECT student.name, enrollment.course FROM student LEFT JOIN enrollment ON student.id=enrollment.student_id WHERE student.age > 22"; + const result = await executeSELECTQuery(query); + expect(result).toEqual( + expect.arrayContaining([ + expect.objectContaining({ + "enrollment.course": "Mathematics", + "student.name": "John", + }), + expect.objectContaining({ + "enrollment.course": "Physics", + "student.name": "John", + }), + ]) + ); + expect(result.length).toEqual(4); +}); + +test("Execute SQL Query with LEFT JOIN with a WHERE clause filtering the join table", async () => { + const query = `SELECT student.name, enrollment.course FROM student LEFT JOIN enrollment ON student.id=enrollment.student_id WHERE enrollment.course = 'Physics'`; + const result = await executeSELECTQuery(query); + expect(result).toEqual( + expect.arrayContaining([ + expect.objectContaining({ + "student.name": "John", + "enrollment.course": "Physics", + }), + ]) + ); + expect(result.length).toEqual(1); +}); + +test("Execute SQL Query with RIGHT JOIN with a WHERE clause filtering the main table", async () => { + const query = + "SELECT student.name, enrollment.course FROM student RIGHT JOIN enrollment ON student.id=enrollment.student_id WHERE student.age < 25"; + const result = await executeSELECTQuery(query); + expect(result).toEqual( + expect.arrayContaining([ + expect.objectContaining({ + "enrollment.course": "Mathematics", + "student.name": "Bob", + }), + expect.objectContaining({ + "enrollment.course": "Biology", + "student.name": null, + }), + ]) + ); + expect(result.length).toEqual(2); +}); + +test("Execute SQL Query with RIGHT JOIN with a WHERE clause filtering the join table", async () => { + const query = `SELECT student.name, enrollment.course FROM student RIGHT JOIN enrollment ON student.id=enrollment.student_id WHERE enrollment.course = 'Chemistry'`; + const result = await executeSELECTQuery(query); + expect(result).toEqual( + expect.arrayContaining([ + expect.objectContaining({ + "enrollment.course": "Chemistry", + "student.name": "Jane", + }), + ]) + ); + expect(result.length).toEqual(1); +}); + +test("Execute SQL Query with RIGHT JOIN with a multiple WHERE clauses filtering the join table and main table", async () => { + const query = `SELECT student.name, enrollment.course FROM student RIGHT JOIN enrollment ON student.id=enrollment.student_id WHERE enrollment.course = 'Chemistry' AND student.age = 26`; + const result = await executeSELECTQuery(query); + expect(result).toEqual([]); +}); diff --git a/tests/queryParser.test.js b/tests/queryParser.test.js new file mode 100644 index 000000000..4c04e0592 --- /dev/null +++ b/tests/queryParser.test.js @@ -0,0 +1,217 @@ +const { parseJoinClause, parseQuery } = require("../src/queryParser"); + +describe("parseJoinClause", () => { + test("Parse SQL Query", () => { + const query = "SELECT id, name FROM student"; + const parsed = parseQuery(query); + expect(parsed).toEqual({ + fields: ["id", "name"], + table: "student", + whereClauses: [], + joinCondition: null, + joinTable: null, + joinType: null, + }); + }); + + test("Parse SQL Query with WHERE Clause", () => { + const query = "SELECT id, name FROM student WHERE age = 25"; + const parsed = parseQuery(query); + expect(parsed).toEqual({ + fields: ["id", "name"], + table: "student", + whereClauses: [ + { + field: "age", + operator: "=", + value: "25", + }, + ], + joinCondition: null, + joinTable: null, + joinType: null, + }); + }); + + test("Parse SQL Query with Multiple WHERE Clauses", () => { + const query = "SELECT id, name FROM student WHERE age = 30 AND name = John"; + const parsed = parseQuery(query); + expect(parsed).toEqual({ + fields: ["id", "name"], + table: "student", + whereClauses: [ + { + field: "age", + operator: "=", + value: "30", + }, + { + field: "name", + operator: "=", + value: "John", + }, + ], + joinCondition: null, + joinTable: null, + joinType: null, + }); + }); + + test("Parse SQL Query with INNER JOIN", async () => { + const query = + "SELECT student.name, enrollment.course FROM student INNER JOIN enrollment ON student.id=enrollment.student_id"; + const result = await parseQuery(query); + expect(result).toEqual({ + fields: ["student.name", "enrollment.course"], + table: "student", + whereClauses: [], + joinTable: "enrollment", + joinType: "INNER", + joinCondition: { left: "student.id", right: "enrollment.student_id" }, + }); + }); + + test("Parse SQL Query with INNER JOIN and WHERE Clause", async () => { + const query = + "SELECT student.name, enrollment.course FROM student INNER JOIN enrollment ON student.id = enrollment.student_id WHERE student.age > 20"; + const result = await parseQuery(query); + expect(result).toEqual({ + fields: ["student.name", "enrollment.course"], + table: "student", + whereClauses: [{ field: "student.age", operator: ">", value: "20" }], + joinTable: "enrollment", + joinType: "INNER", + joinCondition: { left: "student.id", right: "enrollment.student_id" }, + }); + }); + + test("Parse INNER JOIN clause", () => { + const query = + "SELECT * FROM table1 INNER JOIN table2 ON table1.id = table2.ref_id"; + const result = parseJoinClause(query); + expect(result).toEqual({ + joinType: "INNER", + joinTable: "table2", + joinCondition: { left: "table1.id", right: "table2.ref_id" }, + }); + }); + + test("Parse LEFT JOIN clause", () => { + const query = + "SELECT * FROM table1 LEFT JOIN table2 ON table1.id = table2.ref_id"; + const result = parseJoinClause(query); + expect(result).toEqual({ + joinType: "LEFT", + joinTable: "table2", + joinCondition: { left: "table1.id", right: "table2.ref_id" }, + }); + }); + + test("Parse RIGHT JOIN clause", () => { + const query = + "SELECT * FROM table1 RIGHT JOIN table2 ON table1.id = table2.ref_id"; + const result = parseJoinClause(query); + expect(result).toEqual({ + joinType: "RIGHT", + joinTable: "table2", + joinCondition: { left: "table1.id", right: "table2.ref_id" }, + }); + }); + + test("Returns null for queries without JOIN", () => { + const query = "SELECT * FROM table1"; + const result = parseJoinClause(query); + console.log({ result }); + expect(result).toEqual({ + joinType: null, + joinTable: null, + joinCondition: null, + }); + }); + + test("Parse LEFT Join Query Completely", () => { + const query = + "SELECT student.name, enrollment.course FROM student LEFT JOIN enrollment ON student.id=enrollment.student_id"; + const result = parseQuery(query); + expect(result).toEqual({ + fields: ["student.name", "enrollment.course"], + table: "student", + whereClauses: [], + joinType: "LEFT", + joinTable: "enrollment", + joinCondition: { left: "student.id", right: "enrollment.student_id" }, + }); + }); + + test("Parse LEFT Join Query Completely", () => { + const query = + "SELECT student.name, enrollment.course FROM student RIGHT JOIN enrollment ON student.id=enrollment.student_id"; + const result = parseQuery(query); + expect(result).toEqual({ + fields: ["student.name", "enrollment.course"], + table: "student", + whereClauses: [], + joinType: "RIGHT", + joinTable: "enrollment", + joinCondition: { left: "student.id", right: "enrollment.student_id" }, + }); + }); + + test("Parse SQL Query with LEFT JOIN with a WHERE clause filtering the main table", async () => { + const query = + "SELECT student.name, enrollment.course FROM student LEFT JOIN enrollment ON student.id=enrollment.student_id WHERE student.age > 22"; + const result = await parseQuery(query); + expect(result).toEqual({ + fields: ["student.name", "enrollment.course"], + joinCondition: { left: "student.id", right: "enrollment.student_id" }, + joinTable: "enrollment", + joinType: "LEFT", + table: "student", + whereClauses: [{ field: "student.age", operator: ">", value: "22" }], + }); + }); + + test("Parse SQL Query with LEFT JOIN with a WHERE clause filtering the join table", async () => { + const query = `SELECT student.name, enrollment.course FROM student LEFT JOIN enrollment ON student.id=enrollment.student_id WHERE enrollment.course = 'Physics'`; + const result = await parseQuery(query); + expect(result).toEqual({ + fields: ["student.name", "enrollment.course"], + joinCondition: { left: "student.id", right: "enrollment.student_id" }, + joinTable: "enrollment", + joinType: "LEFT", + table: "student", + whereClauses: [ + { field: "enrollment.course", operator: "=", value: "'Physics'" }, + ], + }); + }); + + test("Parse SQL Query with RIGHT JOIN with a WHERE clause filtering the main table", async () => { + const query = + "SELECT student.name, enrollment.course FROM student RIGHT JOIN enrollment ON student.id=enrollment.student_id WHERE student.age < 25"; + const result = await parseQuery(query); + expect(result).toEqual({ + fields: ["student.name", "enrollment.course"], + joinCondition: { left: "student.id", right: "enrollment.student_id" }, + joinTable: "enrollment", + joinType: "RIGHT", + table: "student", + whereClauses: [{ field: "student.age", operator: "<", value: "25" }], + }); + }); + + test("Parse SQL Query with RIGHT JOIN with a WHERE clause filtering the join table", async () => { + const query = `SELECT student.name, enrollment.course FROM student RIGHT JOIN enrollment ON student.id=enrollment.student_id WHERE enrollment.course = 'Chemistry'`; + const result = await parseQuery(query); + expect(result).toEqual({ + fields: ["student.name", "enrollment.course"], + joinCondition: { left: "student.id", right: "enrollment.student_id" }, + joinTable: "enrollment", + joinType: "RIGHT", + table: "student", + whereClauses: [ + { field: "enrollment.course", operator: "=", value: "'Chemistry'" }, + ], + }); + }); +}); diff --git a/tests/step-02/index.test.js b/tests/step-02/index.test.js index a5467ee48..458453533 100644 --- a/tests/step-02/index.test.js +++ b/tests/step-02/index.test.js @@ -1,9 +1,11 @@ -const readCSV = require('../../src/csvReader'); +const { readCSV } = require("../../src/csvReader"); +const { parseSelectQuery, parseJoinClause } = require("../../src/queryParser"); +const { executeSELECTQuery } = require("../../src/queryExecutor"); -test('Read CSV File', async () => { - const data = await readCSV('./sample.csv'); - expect(data.length).toBeGreaterThan(0); - expect(data.length).toBe(3); - expect(data[0].name).toBe('John'); - expect(data[0].age).toBe('30'); //ignore the string type here, we will fix this later -}); \ No newline at end of file +test("Read CSV File", async () => { + const data = await readCSV("./student.csv"); + expect(data.length).toBeGreaterThan(0); + expect(data.length).toBe(4); + expect(data[0].name).toBe("John"); + expect(data[0].age).toBe("30"); //ignore the string type here, we will fix this later +}); diff --git a/tests/step-03/index.test.js b/tests/step-03/index.test.js index 9145ad3e4..b2dc5a7d3 100644 --- a/tests/step-03/index.test.js +++ b/tests/step-03/index.test.js @@ -1,19 +1,29 @@ -const readCSV = require('../../src/csvReader'); -const parseQuery = require('../../src/queryParser'); +const { readCSV } = require("../../src/csvReader"); +const { parseSelectQuery, parseJoinClause } = require("../../src/queryParser"); +const { executeSELECTQuery } = require("../../src/queryExecutor"); -test('Read CSV File', async () => { - const data = await readCSV('./sample.csv'); - expect(data.length).toBeGreaterThan(0); - expect(data.length).toBe(3); - expect(data[0].name).toBe('John'); - expect(data[0].age).toBe('30'); //ignore the string type here, we will fix this later +test("Read CSV File", async () => { + const data = await readCSV("./student.csv"); + expect(data.length).toBeGreaterThan(0); + expect(data.length).toBe(4); + expect(data[0].name).toBe("John"); + expect(data[0].age).toBe("30"); //ignore the string type here, we will fix this later }); -test('Parse SQL Query', () => { - const query = 'SELECT id, name FROM sample'; - const parsed = parseQuery(query); - expect(parsed).toEqual({ - fields: ['id', 'name'], - table: 'sample' - }); -}); \ No newline at end of file +test("Parse SQL Query", () => { + const query = "SELECT id, name FROM student"; + const parsed = parseSelectQuery(query); + expect(parsed).toEqual({ + fields: ["id", "name"], + table: "student", + whereClauses: [], + joinCondition: null, + joinTable: null, + joinType: null, + groupByFields: null, + hasAggregateWithoutGroupBy: false, + isDistinct: false, + limit: null, + orderByFields: null, + }); +}); diff --git a/tests/step-04/index.test.js b/tests/step-04/index.test.js index bc353dd3d..39adc9323 100644 --- a/tests/step-04/index.test.js +++ b/tests/step-04/index.test.js @@ -1,30 +1,39 @@ -const readCSV = require('../../src/csvReader'); -const parseQuery = require('../../src/queryParser'); -const executeSELECTQuery = require('../../src/index'); +const { readCSV } = require("../../src/csvReader"); +const { parseSelectQuery, parseJoinClause } = require("../../src/queryParser"); +const { executeSELECTQuery } = require("../../src/queryExecutor"); -test('Read CSV File', async () => { - const data = await readCSV('./sample.csv'); - expect(data.length).toBeGreaterThan(0); - expect(data.length).toBe(3); - expect(data[0].name).toBe('John'); - expect(data[0].age).toBe('30'); //ignore the string type here, we will fix this later +test("Read CSV File", async () => { + const data = await readCSV("./student.csv"); + expect(data.length).toBeGreaterThan(0); + expect(data.length).toBe(4); + expect(data[0].name).toBe("John"); + expect(data[0].age).toBe("30"); //ignore the string type here, we will fix this later }); -test('Parse SQL Query', () => { - const query = 'SELECT id, name FROM sample'; - const parsed = parseQuery(query); - expect(parsed).toEqual({ - fields: ['id', 'name'], - table: 'sample' - }); +test("Parse SQL Query", () => { + const query = "SELECT id, name FROM student"; + const parsed = parseSelectQuery(query); + expect(parsed).toEqual({ + fields: ["id", "name"], + table: "student", + whereClauses: [], + joinCondition: null, + joinTable: null, + joinType: null, + groupByFields: null, + hasAggregateWithoutGroupBy: false, + isDistinct: false, + limit: null, + orderByFields: null, + }); }); -test('Execute SQL Query', async () => { - const query = 'SELECT id, name FROM sample'; - const result = await executeSELECTQuery(query); - expect(result.length).toBeGreaterThan(0); - expect(result[0]).toHaveProperty('id'); - expect(result[0]).toHaveProperty('name'); - expect(result[0]).not.toHaveProperty('age'); - expect(result[0]).toEqual({ id: '1', name: 'John' }); -}); \ No newline at end of file +test("Execute SQL Query", async () => { + const query = "SELECT id, name FROM student"; + const result = await executeSELECTQuery(query); + expect(result.length).toBeGreaterThan(0); + expect(result[0]).toHaveProperty("id"); + expect(result[0]).toHaveProperty("name"); + expect(result[0]).not.toHaveProperty("age"); + expect(result[0]).toEqual({ id: "1", name: "John" }); +}); diff --git a/tests/step-05/index.test.js b/tests/step-05/index.test.js index 66a77c061..a4dbcefec 100644 --- a/tests/step-05/index.test.js +++ b/tests/step-05/index.test.js @@ -1,50 +1,72 @@ -const readCSV = require('../../src/csvReader'); -const parseQuery = require('../../src/queryParser'); -const executeSELECTQuery = require('../../src/index'); +const { readCSV } = require("../../src/csvReader"); +const { parseSelectQuery, parseJoinClause } = require("../../src/queryParser"); +const { executeSELECTQuery } = require("../../src/queryExecutor"); -test('Read CSV File', async () => { - const data = await readCSV('./sample.csv'); - expect(data.length).toBeGreaterThan(0); - expect(data.length).toBe(3); - expect(data[0].name).toBe('John'); - expect(data[0].age).toBe('30'); //ignore the string type here, we will fix this later +test("Read CSV File", async () => { + const data = await readCSV("./student.csv"); + expect(data.length).toBeGreaterThan(0); + expect(data.length).toBe(4); + expect(data[0].name).toBe("John"); + expect(data[0].age).toBe("30"); //ignore the string type here, we will fix this later }); -test('Parse SQL Query', () => { - const query = 'SELECT id, name FROM sample'; - const parsed = parseQuery(query); - expect(parsed).toEqual({ - fields: ['id', 'name'], - table: 'sample', - whereClause: null - }); +test("Parse SQL Query", () => { + const query = "SELECT id, name FROM student"; + const parsed = parseSelectQuery(query); + expect(parsed).toEqual({ + fields: ["id", "name"], + table: "student", + whereClauses: [], + joinCondition: null, + joinTable: null, + joinType: null, + groupByFields: null, + hasAggregateWithoutGroupBy: false, + isDistinct: false, + limit: null, + orderByFields: null, + }); }); -test('Execute SQL Query', async () => { - const query = 'SELECT id, name FROM sample'; - const result = await executeSELECTQuery(query); - expect(result.length).toBeGreaterThan(0); - expect(result[0]).toHaveProperty('id'); - expect(result[0]).toHaveProperty('name'); - expect(result[0]).not.toHaveProperty('age'); - expect(result[0]).toEqual({ id: '1', name: 'John' }); +test("Execute SQL Query", async () => { + const query = "SELECT id, name FROM student"; + const result = await executeSELECTQuery(query); + expect(result.length).toBeGreaterThan(0); + expect(result[0]).toHaveProperty("id"); + expect(result[0]).toHaveProperty("name"); + expect(result[0]).not.toHaveProperty("age"); + expect(result[0]).toEqual({ id: "1", name: "John" }); }); -test('Parse SQL Query with WHERE Clause', () => { - const query = 'SELECT id, name FROM sample WHERE age = 25'; - const parsed = parseQuery(query); - expect(parsed).toEqual({ - fields: ['id', 'name'], - table: 'sample', - whereClause: 'age = 25' - }); +test("Parse SQL Query with WHERE Clause", () => { + const query = "SELECT id, name FROM student WHERE age = 25"; + const parsed = parseSelectQuery(query); + expect(parsed).toEqual({ + fields: ["id", "name"], + table: "student", + whereClauses: [ + { + field: "age", + operator: "=", + value: "25", + }, + ], + joinCondition: null, + joinTable: null, + joinType: null, + groupByFields: null, + hasAggregateWithoutGroupBy: false, + isDistinct: false, + limit: null, + orderByFields: null, + }); }); -test('Execute SQL Query with WHERE Clause', async () => { - const query = 'SELECT id, name FROM sample WHERE age = 25'; - const result = await executeSELECTQuery(query); - expect(result.length).toBe(1); - expect(result[0]).toHaveProperty('id'); - expect(result[0]).toHaveProperty('name'); - expect(result[0].id).toBe('2'); -}); \ No newline at end of file +test("Execute SQL Query with WHERE Clause", async () => { + const query = "SELECT id, name FROM student WHERE age = 25"; + const result = await executeSELECTQuery(query); + expect(result.length).toBe(1); + expect(result[0]).toHaveProperty("id"); + expect(result[0]).toHaveProperty("name"); + expect(result[0].id).toBe("2"); +}); diff --git a/tests/step-06/index.test.js b/tests/step-06/index.test.js index 2e2ef6416..efb79a6d6 100644 --- a/tests/step-06/index.test.js +++ b/tests/step-06/index.test.js @@ -1,79 +1,108 @@ -const readCSV = require('../../src/csvReader'); -const parseQuery = require('../../src/queryParser'); -const executeSELECTQuery = require('../../src/index'); +const { readCSV } = require("../../src/csvReader"); +const { parseSelectQuery, parseJoinClause } = require("../../src/queryParser"); +const { executeSELECTQuery } = require("../../src/queryExecutor"); -test('Read CSV File', async () => { - const data = await readCSV('./sample.csv'); - expect(data.length).toBeGreaterThan(0); - expect(data.length).toBe(3); - expect(data[0].name).toBe('John'); - expect(data[0].age).toBe('30'); //ignore the string type here, we will fix this later +test("Read CSV File", async () => { + const data = await readCSV("./student.csv"); + expect(data.length).toBeGreaterThan(0); + expect(data.length).toBe(4); + expect(data[0].name).toBe("John"); + expect(data[0].age).toBe("30"); //ignore the string type here, we will fix this later }); -test('Parse SQL Query', () => { - const query = 'SELECT id, name FROM sample'; - const parsed = parseQuery(query); - expect(parsed).toEqual({ - fields: ['id', 'name'], - table: 'sample', - whereClauses: [] - }); +test("Parse SQL Query", () => { + const query = "SELECT id, name FROM student"; + const parsed = parseSelectQuery(query); + expect(parsed).toEqual({ + fields: ["id", "name"], + table: "student", + whereClauses: [], + joinCondition: null, + joinTable: null, + joinType: null, + groupByFields: null, + hasAggregateWithoutGroupBy: false, + isDistinct: false, + limit: null, + orderByFields: null, + }); }); -test('Execute SQL Query', async () => { - const query = 'SELECT id, name FROM sample'; - const result = await executeSELECTQuery(query); - expect(result.length).toBeGreaterThan(0); - expect(result[0]).toHaveProperty('id'); - expect(result[0]).toHaveProperty('name'); - expect(result[0]).not.toHaveProperty('age'); - expect(result[0]).toEqual({ id: '1', name: 'John' }); +test("Execute SQL Query", async () => { + const query = "SELECT id, name FROM student"; + const result = await executeSELECTQuery(query); + expect(result.length).toBeGreaterThan(0); + expect(result[0]).toHaveProperty("id"); + expect(result[0]).toHaveProperty("name"); + expect(result[0]).not.toHaveProperty("age"); + expect(result[0]).toEqual({ id: "1", name: "John" }); }); -test('Parse SQL Query with WHERE Clause', () => { - const query = 'SELECT id, name FROM sample WHERE age = 25'; - const parsed = parseQuery(query); - expect(parsed).toEqual({ - fields: ['id', 'name'], - table: 'sample', - whereClauses: [{ - field: "age", - operator: "=", - value: "25", - }], - }); +test("Parse SQL Query with WHERE Clause", () => { + const query = "SELECT id, name FROM student WHERE age = 25"; + const parsed = parseSelectQuery(query); + expect(parsed).toEqual({ + fields: ["id", "name"], + table: "student", + whereClauses: [ + { + field: "age", + operator: "=", + value: "25", + }, + ], + joinCondition: null, + joinTable: null, + joinType: null, + groupByFields: null, + hasAggregateWithoutGroupBy: false, + isDistinct: false, + limit: null, + orderByFields: null, + }); }); -test('Execute SQL Query with WHERE Clause', async () => { - const query = 'SELECT id, name FROM sample WHERE age = 25'; - const result = await executeSELECTQuery(query); - expect(result.length).toBe(1); - expect(result[0]).toHaveProperty('id'); - expect(result[0]).toHaveProperty('name'); - expect(result[0].id).toBe('2'); +test("Execute SQL Query with WHERE Clause", async () => { + const query = "SELECT id, name FROM student WHERE age = 25"; + const result = await executeSELECTQuery(query); + expect(result.length).toBe(1); + expect(result[0]).toHaveProperty("id"); + expect(result[0]).toHaveProperty("name"); + expect(result[0].id).toBe("2"); }); -test('Parse SQL Query with Multiple WHERE Clauses', () => { - const query = 'SELECT id, name FROM sample WHERE age = 30 AND name = John'; - const parsed = parseQuery(query); - expect(parsed).toEqual({ - fields: ['id', 'name'], - table: 'sample', - whereClauses: [{ - "field": "age", - "operator": "=", - "value": "30", - }, { - "field": "name", - "operator": "=", - "value": "John", - }] - }); +test("Parse SQL Query with Multiple WHERE Clauses", () => { + const query = "SELECT id, name FROM student WHERE age = 30 AND name = John"; + const parsed = parseSelectQuery(query); + expect(parsed).toEqual({ + fields: ["id", "name"], + table: "student", + whereClauses: [ + { + field: "age", + operator: "=", + value: "30", + }, + { + field: "name", + operator: "=", + value: "John", + }, + ], + joinCondition: null, + joinTable: null, + joinType: null, + groupByFields: null, + hasAggregateWithoutGroupBy: false, + isDistinct: false, + limit: null, + orderByFields: null, + }); }); -test('Execute SQL Query with Multiple WHERE Clause', async () => { - const query = 'SELECT id, name FROM sample WHERE age = 30 AND name = John'; - const result = await executeSELECTQuery(query); - expect(result.length).toBe(1); - expect(result[0]).toEqual({ id: '1', name: 'John' }); -}); \ No newline at end of file +test("Execute SQL Query with Complex WHERE Clause", async () => { + const query = "SELECT id, name FROM student WHERE age = 30 AND name = John"; + const result = await executeSELECTQuery(query); + expect(result.length).toBe(1); + expect(result[0]).toEqual({ id: "1", name: "John" }); +}); diff --git a/tests/step-07/index.test.js b/tests/step-07/index.test.js index ee0ebed5e..a1000323f 100644 --- a/tests/step-07/index.test.js +++ b/tests/step-07/index.test.js @@ -1,93 +1,122 @@ -const readCSV = require('../../src/csvReader'); -const parseQuery = require('../../src/queryParser'); -const executeSELECTQuery = require('../../src/index'); +const { readCSV } = require("../../src/csvReader"); +const { parseSelectQuery, parseJoinClause } = require("../../src/queryParser"); +const { executeSELECTQuery } = require("../../src/queryExecutor"); -test('Read CSV File', async () => { - const data = await readCSV('./sample.csv'); - expect(data.length).toBeGreaterThan(0); - expect(data.length).toBe(3); - expect(data[0].name).toBe('John'); - expect(data[0].age).toBe('30'); //ignore the string type here, we will fix this later +test("Read CSV File", async () => { + const data = await readCSV("./student.csv"); + expect(data.length).toBeGreaterThan(0); + expect(data.length).toBe(4); + expect(data[0].name).toBe("John"); + expect(data[0].age).toBe("30"); //ignore the string type here, we will fix this later }); -test('Parse SQL Query', () => { - const query = 'SELECT id, name FROM sample'; - const parsed = parseQuery(query); - expect(parsed).toEqual({ - fields: ['id', 'name'], - table: 'sample', - whereClauses: [] - }); +test("Parse SQL Query", () => { + const query = "SELECT id, name FROM student"; + const parsed = parseSelectQuery(query); + expect(parsed).toEqual({ + fields: ["id", "name"], + table: "student", + whereClauses: [], + joinCondition: null, + joinTable: null, + joinType: null, + groupByFields: null, + hasAggregateWithoutGroupBy: false, + isDistinct: false, + limit: null, + orderByFields: null, + }); }); -test('Execute SQL Query', async () => { - const query = 'SELECT id, name FROM sample'; - const result = await executeSELECTQuery(query); - expect(result.length).toBeGreaterThan(0); - expect(result[0]).toHaveProperty('id'); - expect(result[0]).toHaveProperty('name'); - expect(result[0]).not.toHaveProperty('age'); - expect(result[0]).toEqual({ id: '1', name: 'John' }); +test("Execute SQL Query", async () => { + const query = "SELECT id, name FROM student"; + const result = await executeSELECTQuery(query); + expect(result.length).toBeGreaterThan(0); + expect(result[0]).toHaveProperty("id"); + expect(result[0]).toHaveProperty("name"); + expect(result[0]).not.toHaveProperty("age"); + expect(result[0]).toEqual({ id: "1", name: "John" }); }); -test('Parse SQL Query with WHERE Clause', () => { - const query = 'SELECT id, name FROM sample WHERE age = 25'; - const parsed = parseQuery(query); - expect(parsed).toEqual({ - fields: ['id', 'name'], - table: 'sample', - whereClauses: [{ - field: "age", - operator: "=", - value: "25", - }], - }); +test("Parse SQL Query with WHERE Clause", () => { + const query = "SELECT id, name FROM student WHERE age = 25"; + const parsed = parseSelectQuery(query); + expect(parsed).toEqual({ + fields: ["id", "name"], + table: "student", + whereClauses: [ + { + field: "age", + operator: "=", + value: "25", + }, + ], + joinCondition: null, + joinTable: null, + joinType: null, + groupByFields: null, + hasAggregateWithoutGroupBy: false, + isDistinct: false, + limit: null, + orderByFields: null, + }); }); -test('Execute SQL Query with WHERE Clause', async () => { - const query = 'SELECT id, name FROM sample WHERE age = 25'; - const result = await executeSELECTQuery(query); - expect(result.length).toBe(1); - expect(result[0]).toHaveProperty('id'); - expect(result[0]).toHaveProperty('name'); - expect(result[0].id).toBe('2'); +test("Execute SQL Query with WHERE Clause", async () => { + const query = "SELECT id, name FROM student WHERE age = 25"; + const result = await executeSELECTQuery(query); + expect(result.length).toBe(1); + expect(result[0]).toHaveProperty("id"); + expect(result[0]).toHaveProperty("name"); + expect(result[0].id).toBe("2"); }); -test('Parse SQL Query with Multiple WHERE Clauses', () => { - const query = 'SELECT id, name FROM sample WHERE age = 30 AND name = John'; - const parsed = parseQuery(query); - expect(parsed).toEqual({ - fields: ['id', 'name'], - table: 'sample', - whereClauses: [{ - "field": "age", - "operator": "=", - "value": "30", - }, { - "field": "name", - "operator": "=", - "value": "John", - }] - }); +test("Parse SQL Query with Multiple WHERE Clauses", () => { + const query = "SELECT id, name FROM student WHERE age = 30 AND name = John"; + const parsed = parseSelectQuery(query); + expect(parsed).toEqual({ + fields: ["id", "name"], + table: "student", + whereClauses: [ + { + field: "age", + operator: "=", + value: "30", + }, + { + field: "name", + operator: "=", + value: "John", + }, + ], + joinCondition: null, + joinTable: null, + joinType: null, + groupByFields: null, + hasAggregateWithoutGroupBy: false, + isDistinct: false, + limit: null, + orderByFields: null, + }); }); -test('Execute SQL Query with Multiple WHERE Clause', async () => { - const query = 'SELECT id, name FROM sample WHERE age = 30 AND name = John'; - const result = await executeSELECTQuery(query); - expect(result.length).toBe(1); - expect(result[0]).toEqual({ id: '1', name: 'John' }); +test("Execute SQL Query with Complex WHERE Clause", async () => { + const query = "SELECT id, name FROM student WHERE age = 30 AND name = John"; + const result = await executeSELECTQuery(query); + expect(result.length).toBe(1); + expect(result[0]).toEqual({ id: "1", name: "John" }); }); -test('Execute SQL Query with Greater Than', async () => { - const queryWithGT = 'SELECT id FROM sample WHERE age > 22'; - const result = await executeSELECTQuery(queryWithGT); - expect(result.length).toEqual(2); - expect(result[0]).toHaveProperty('id'); +test("Execute SQL Query with Greater Than", async () => { + const queryWithGT = "SELECT id FROM student WHERE age > 22"; + const result = await executeSELECTQuery(queryWithGT); + expect(result.length).toEqual(3); + expect(result[0]).toHaveProperty("id"); }); -test('Execute SQL Query with Not Equal to', async () => { - const queryWithGT = 'SELECT name FROM sample WHERE age != 25'; - const result = await executeSELECTQuery(queryWithGT); - expect(result.length).toEqual(2); - expect(result[0]).toHaveProperty('name'); -}); \ No newline at end of file +test("Execute SQL Query with Not Equal to", async () => { + const queryWithGT = "SELECT name FROM student WHERE age != 25"; + const result = await executeSELECTQuery(queryWithGT); + expect(result.length).toEqual(3); + expect(result[0]).toHaveProperty("name"); +}); diff --git a/tests/step-08/index.test.js b/tests/step-08/index.test.js index aab1467e6..1145b265c 100644 --- a/tests/step-08/index.test.js +++ b/tests/step-08/index.test.js @@ -1,131 +1,169 @@ -const readCSV = require('../../src/csvReader'); -const parseQuery = require('../../src/queryParser'); -const executeSELECTQuery = require('../../src/index'); +const { readCSV } = require("../../src/csvReader"); +const { parseSelectQuery, parseJoinClause } = require("../../src/queryParser"); +const { executeSELECTQuery } = require("../../src/queryExecutor"); -test('Read CSV File', async () => { - const data = await readCSV('./student.csv'); - expect(data.length).toBeGreaterThan(0); - expect(data.length).toBe(3); - expect(data[0].name).toBe('John'); - expect(data[0].age).toBe('30'); //ignore the string type here, we will fix this later +test("Read CSV File", async () => { + const data = await readCSV("./student.csv"); + expect(data.length).toBeGreaterThan(0); + expect(data.length).toBe(4); + expect(data[0].name).toBe("John"); + expect(data[0].age).toBe("30"); //ignore the string type here, we will fix this later }); -test('Parse SQL Query', () => { - const query = 'SELECT id, name FROM student'; - const parsed = parseQuery(query); - expect(parsed).toEqual({ - fields: ['id', 'name'], - table: 'student', - whereClauses: [], - joinCondition: null, - joinTable: null - }); +test("Parse SQL Query", () => { + const query = "SELECT id, name FROM student"; + const parsed = parseSelectQuery(query); + expect(parsed).toEqual({ + fields: ["id", "name"], + table: "student", + whereClauses: [], + joinCondition: null, + joinTable: null, + joinType: null, + groupByFields: null, + hasAggregateWithoutGroupBy: false, + isDistinct: false, + limit: null, + orderByFields: null, + }); }); -test('Execute SQL Query', async () => { - const query = 'SELECT id, name FROM student'; - const result = await executeSELECTQuery(query); - expect(result.length).toBeGreaterThan(0); - expect(result[0]).toHaveProperty('id'); - expect(result[0]).toHaveProperty('name'); - expect(result[0]).not.toHaveProperty('age'); - expect(result[0]).toEqual({ id: '1', name: 'John' }); +test("Execute SQL Query", async () => { + const query = "SELECT id, name FROM student"; + const result = await executeSELECTQuery(query); + expect(result.length).toBeGreaterThan(0); + expect(result[0]).toHaveProperty("id"); + expect(result[0]).toHaveProperty("name"); + expect(result[0]).not.toHaveProperty("age"); + expect(result[0]).toEqual({ id: "1", name: "John" }); }); -test('Parse SQL Query with WHERE Clause', () => { - const query = 'SELECT id, name FROM student WHERE age = 25'; - const parsed = parseQuery(query); - expect(parsed).toEqual({ - fields: ['id', 'name'], - table: 'student', - whereClauses: [{ - "field": "age", - "operator": "=", - "value": "25", - }], - joinCondition: null, - joinTable: null - }); +test("Parse SQL Query with WHERE Clause", () => { + const query = "SELECT id, name FROM student WHERE age = 25"; + const parsed = parseSelectQuery(query); + expect(parsed).toEqual({ + fields: ["id", "name"], + table: "student", + whereClauses: [ + { + field: "age", + operator: "=", + value: "25", + }, + ], + joinCondition: null, + joinTable: null, + joinType: null, + groupByFields: null, + hasAggregateWithoutGroupBy: false, + isDistinct: false, + limit: null, + orderByFields: null, + }); }); -test('Execute SQL Query with WHERE Clause', async () => { - const query = 'SELECT id, name FROM student WHERE age = 25'; - const result = await executeSELECTQuery(query); - expect(result.length).toBe(1); - expect(result[0]).toHaveProperty('id'); - expect(result[0]).toHaveProperty('name'); - expect(result[0].id).toBe('2'); +test("Execute SQL Query with WHERE Clause", async () => { + const query = "SELECT id, name FROM student WHERE age = 25"; + const result = await executeSELECTQuery(query); + expect(result.length).toBe(1); + expect(result[0]).toHaveProperty("id"); + expect(result[0]).toHaveProperty("name"); + expect(result[0].id).toBe("2"); }); -test('Parse SQL Query with Multiple WHERE Clauses', () => { - const query = 'SELECT id, name FROM student WHERE age = 30 AND name = John'; - const parsed = parseQuery(query); - expect(parsed).toEqual({ - fields: ['id', 'name'], - table: 'student', - whereClauses: [{ - "field": "age", - "operator": "=", - "value": "30", - }, { - "field": "name", - "operator": "=", - "value": "John", - }], - joinCondition: null, - joinTable: null - }); +test("Parse SQL Query with Multiple WHERE Clauses", () => { + const query = "SELECT id, name FROM student WHERE age = 30 AND name = John"; + const parsed = parseSelectQuery(query); + expect(parsed).toEqual({ + fields: ["id", "name"], + table: "student", + whereClauses: [ + { + field: "age", + operator: "=", + value: "30", + }, + { + field: "name", + operator: "=", + value: "John", + }, + ], + joinCondition: null, + joinTable: null, + joinType: null, + groupByFields: null, + hasAggregateWithoutGroupBy: false, + isDistinct: false, + limit: null, + orderByFields: null, + }); }); -test('Execute SQL Query with Complex WHERE Clause', async () => { - const query = 'SELECT id, name FROM student WHERE age = 30 AND name = John'; - const result = await executeSELECTQuery(query); - expect(result.length).toBe(1); - expect(result[0]).toEqual({ id: '1', name: 'John' }); +test("Execute SQL Query with Complex WHERE Clause", async () => { + const query = "SELECT id, name FROM student WHERE age = 30 AND name = John"; + const result = await executeSELECTQuery(query); + expect(result.length).toBe(1); + expect(result[0]).toEqual({ id: "1", name: "John" }); }); -test('Execute SQL Query with Greater Than', async () => { - const queryWithGT = 'SELECT id FROM student WHERE age > 22'; - const result = await executeSELECTQuery(queryWithGT); - expect(result.length).toEqual(2); - expect(result[0]).toHaveProperty('id'); +test("Execute SQL Query with Greater Than", async () => { + const queryWithGT = "SELECT id FROM student WHERE age > 22"; + const result = await executeSELECTQuery(queryWithGT); + expect(result.length).toEqual(3); + expect(result[0]).toHaveProperty("id"); }); -test('Execute SQL Query with Not Equal to', async () => { - const queryWithGT = 'SELECT name FROM student WHERE age != 25'; - const result = await executeSELECTQuery(queryWithGT); - expect(result.length).toEqual(2); - expect(result[0]).toHaveProperty('name'); +test("Execute SQL Query with Not Equal to", async () => { + const queryWithGT = "SELECT name FROM student WHERE age != 25"; + const result = await executeSELECTQuery(queryWithGT); + expect(result.length).toEqual(3); + expect(result[0]).toHaveProperty("name"); }); -test('Parse SQL Query with INNER JOIN', async () => { - const query = 'SELECT student.name, enrollment.course FROM student INNER JOIN enrollment ON student.id=enrollment.student_id'; - const result = await parseQuery(query); - expect(result).toEqual({ - fields: ['student.name', 'enrollment.course'], - table: 'student', - whereClauses: [], - joinTable: 'enrollment', - joinCondition: { left: 'student.id', right: 'enrollment.student_id' } - }) +test("Parse SQL Query with INNER JOIN", async () => { + const query = + "SELECT student.name, enrollment.course FROM student INNER JOIN enrollment ON student.id=enrollment.student_id"; + const result = await parseSelectQuery(query); + expect(result).toEqual({ + fields: ["student.name", "enrollment.course"], + table: "student", + whereClauses: [], + joinTable: "enrollment", + joinCondition: { left: "student.id", right: "enrollment.student_id" }, + joinType: "INNER", + groupByFields: null, + hasAggregateWithoutGroupBy: false, + isDistinct: false, + limit: null, + orderByFields: null, + }); }); -test('Parse SQL Query with INNER JOIN and WHERE Clause', async () => { - const query = 'SELECT student.name, enrollment.course FROM student INNER JOIN enrollment ON student.id = enrollment.student_id WHERE student.age > 20'; - const result = await parseQuery(query); - expect(result).toEqual({ - fields: ['student.name', 'enrollment.course'], - table: 'student', - whereClauses: [{ field: 'student.age', operator: '>', value: '20' }], - joinTable: 'enrollment', - joinCondition: { left: 'student.id', right: 'enrollment.student_id' } - }) +test("Parse SQL Query with INNER JOIN and WHERE Clause", async () => { + const query = + "SELECT student.name, enrollment.course FROM student INNER JOIN enrollment ON student.id = enrollment.student_id WHERE student.age > 20"; + const result = await parseSelectQuery(query); + expect(result).toEqual({ + fields: ["student.name", "enrollment.course"], + table: "student", + whereClauses: [{ field: "student.age", operator: ">", value: "20" }], + joinTable: "enrollment", + joinCondition: { left: "student.id", right: "enrollment.student_id" }, + joinType: "INNER", + groupByFields: null, + hasAggregateWithoutGroupBy: false, + isDistinct: false, + limit: null, + orderByFields: null, + }); }); -test('Execute SQL Query with INNER JOIN', async () => { - const query = 'SELECT student.name, enrollment.course FROM student INNER JOIN enrollment ON student.id=enrollment.student_id'; - const result = await executeSELECTQuery(query); - /* +test("Execute SQL Query with INNER JOIN", async () => { + const query = + "SELECT student.name, enrollment.course FROM student INNER JOIN enrollment ON student.id=enrollment.student_id"; + const result = await executeSELECTQuery(query); + /* result = [ { 'student.name': 'John', 'enrollment.course': 'Mathematics' }, { 'student.name': 'John', 'enrollment.course': 'Physics' }, @@ -133,35 +171,34 @@ test('Execute SQL Query with INNER JOIN', async () => { { 'student.name': 'Bob', 'enrollment.course': 'Mathematics' } ] */ - expect(result.length).toEqual(4); - // toHaveProperty is not working here due to dot in the property name - expect(result[0]).toEqual(expect.objectContaining({ - "enrollment.course": "Mathematics", - "student.name": "John" - })); + expect(result.length).toEqual(4); + // toHaveProperty is not working here due to dot in the property name + expect(result[0]).toEqual( + expect.objectContaining({ + "enrollment.course": "Mathematics", + "student.name": "John", + }) + ); }); -test('Execute SQL Query with INNER JOIN and a WHERE Clause', async () => { - const query = 'SELECT student.name, enrollment.course, student.age FROM student INNER JOIN enrollment ON student.id = enrollment.student_id WHERE student.age > 25'; - const result = await executeSELECTQuery(query); - /* +test("Execute SQL Query with INNER JOIN and a WHERE Clause", async () => { + const query = + "SELECT student.name, enrollment.course, student.age FROM student INNER JOIN enrollment ON student.id = enrollment.student_id WHERE student.age > 25"; + const result = await executeSELECTQuery(query); + /* result = [ { 'student.name': 'John', - 'enrollment.course': 'Mathematics', - 'student.age': '30' - }, - { - 'student.name': 'John', - 'enrollment.course': 'Physics', - 'student.age': '30' + } ] */ - expect(result.length).toEqual(2); - // toHaveProperty is not working here due to dot in the property name - expect(result[0]).toEqual(expect.objectContaining({ - "enrollment.course": "Mathematics", - "student.name": "John" - })); -}); \ No newline at end of file + expect(result.length).toEqual(2); + // toHaveProperty is not working here due to dot in the property name + expect(result[0]).toEqual( + expect.objectContaining({ + "enrollment.course": "Mathematics", + "student.name": "John", + }) + ); +}); diff --git a/tests/step-09/index.test.js b/tests/step-09/index.test.js index aaf711f5a..875263788 100644 --- a/tests/step-09/index.test.js +++ b/tests/step-09/index.test.js @@ -1,136 +1,169 @@ -const readCSV = require('../../src/csvReader'); -const {parseQuery} = require('../../src/queryParser'); -const executeSELECTQuery = require('../../src/index'); +const { readCSV } = require("../../src/csvReader"); +const { parseSelectQuery, parseJoinClause } = require("../../src/queryParser"); +const { executeSELECTQuery } = require("../../src/queryExecutor"); -test('Read CSV File', async () => { - const data = await readCSV('./student.csv'); - expect(data.length).toBeGreaterThan(0); - expect(data.length).toBe(4); - expect(data[0].name).toBe('John'); - expect(data[0].age).toBe('30'); //ignore the string type here, we will fix this later +test("Read CSV File", async () => { + const data = await readCSV("./student.csv"); + expect(data.length).toBeGreaterThan(0); + expect(data.length).toBe(4); + expect(data[0].name).toBe("John"); + expect(data[0].age).toBe("30"); //ignore the string type here, we will fix this later }); -test('Parse SQL Query', () => { - const query = 'SELECT id, name FROM student'; - const parsed = parseQuery(query); - expect(parsed).toEqual({ - fields: ['id', 'name'], - table: 'student', - whereClauses: [], - joinCondition: null, - joinTable: null, - joinType: null - }); +test("Parse SQL Query", () => { + const query = "SELECT id, name FROM student"; + const parsed = parseSelectQuery(query); + expect(parsed).toEqual({ + fields: ["id", "name"], + table: "student", + whereClauses: [], + joinCondition: null, + joinTable: null, + joinType: null, + groupByFields: null, + hasAggregateWithoutGroupBy: false, + isDistinct: false, + limit: null, + orderByFields: null, + }); }); -test('Execute SQL Query', async () => { - const query = 'SELECT id, name FROM student'; - const result = await executeSELECTQuery(query); - expect(result.length).toBeGreaterThan(0); - expect(result[0]).toHaveProperty('id'); - expect(result[0]).toHaveProperty('name'); - expect(result[0]).not.toHaveProperty('age'); - expect(result[0]).toEqual({ id: '1', name: 'John' }); +test("Execute SQL Query", async () => { + const query = "SELECT id, name FROM student"; + const result = await executeSELECTQuery(query); + expect(result.length).toBeGreaterThan(0); + expect(result[0]).toHaveProperty("id"); + expect(result[0]).toHaveProperty("name"); + expect(result[0]).not.toHaveProperty("age"); + expect(result[0]).toEqual({ id: "1", name: "John" }); }); -test('Parse SQL Query with WHERE Clause', () => { - const query = 'SELECT id, name FROM student WHERE age = 25'; - const parsed = parseQuery(query); - expect(parsed).toEqual({ - fields: ['id', 'name'], - table: 'student', - whereClauses: [{ - "field": "age", - "operator": "=", - "value": "25", - }], - joinCondition: null, - joinTable: null, - joinType: null - }); +test("Parse SQL Query with WHERE Clause", () => { + const query = "SELECT id, name FROM student WHERE age = 25"; + const parsed = parseSelectQuery(query); + expect(parsed).toEqual({ + fields: ["id", "name"], + table: "student", + whereClauses: [ + { + field: "age", + operator: "=", + value: "25", + }, + ], + joinCondition: null, + joinTable: null, + joinType: null, + groupByFields: null, + hasAggregateWithoutGroupBy: false, + isDistinct: false, + limit: null, + orderByFields: null, + }); }); -test('Execute SQL Query with WHERE Clause', async () => { - const query = 'SELECT id, name FROM student WHERE age = 25'; - const result = await executeSELECTQuery(query); - expect(result.length).toBe(1); - expect(result[0]).toHaveProperty('id'); - expect(result[0]).toHaveProperty('name'); - expect(result[0].id).toBe('2'); +test("Execute SQL Query with WHERE Clause", async () => { + const query = "SELECT id, name FROM student WHERE age = 25"; + const result = await executeSELECTQuery(query); + expect(result.length).toBe(1); + expect(result[0]).toHaveProperty("id"); + expect(result[0]).toHaveProperty("name"); + expect(result[0].id).toBe("2"); }); -test('Parse SQL Query with Multiple WHERE Clauses', () => { - const query = 'SELECT id, name FROM student WHERE age = 30 AND name = John'; - const parsed = parseQuery(query); - expect(parsed).toEqual({ - fields: ['id', 'name'], - table: 'student', - whereClauses: [{ - "field": "age", - "operator": "=", - "value": "30", - }, { - "field": "name", - "operator": "=", - "value": "John", - }], - joinCondition: null, - joinTable: null, - joinType: null - }); +test("Parse SQL Query with Multiple WHERE Clauses", () => { + const query = "SELECT id, name FROM student WHERE age = 30 AND name = John"; + const parsed = parseSelectQuery(query); + expect(parsed).toEqual({ + fields: ["id", "name"], + table: "student", + whereClauses: [ + { + field: "age", + operator: "=", + value: "30", + }, + { + field: "name", + operator: "=", + value: "John", + }, + ], + joinCondition: null, + joinTable: null, + joinType: null, + groupByFields: null, + hasAggregateWithoutGroupBy: false, + isDistinct: false, + limit: null, + orderByFields: null, + }); }); -test('Execute SQL Query with Complex WHERE Clause', async () => { - const query = 'SELECT id, name FROM student WHERE age = 30 AND name = John'; - const result = await executeSELECTQuery(query); - expect(result.length).toBe(1); - expect(result[0]).toEqual({ id: '1', name: 'John' }); +test("Execute SQL Query with Complex WHERE Clause", async () => { + const query = "SELECT id, name FROM student WHERE age = 30 AND name = John"; + const result = await executeSELECTQuery(query); + expect(result.length).toBe(1); + expect(result[0]).toEqual({ id: "1", name: "John" }); }); -test('Execute SQL Query with Greater Than', async () => { - const queryWithGT = 'SELECT id FROM student WHERE age > 22'; - const result = await executeSELECTQuery(queryWithGT); - expect(result.length).toEqual(3); - expect(result[0]).toHaveProperty('id'); +test("Execute SQL Query with Greater Than", async () => { + const queryWithGT = "SELECT id FROM student WHERE age > 22"; + const result = await executeSELECTQuery(queryWithGT); + expect(result.length).toEqual(3); + expect(result[0]).toHaveProperty("id"); }); -test('Execute SQL Query with Not Equal to', async () => { - const queryWithGT = 'SELECT name FROM student WHERE age != 25'; - const result = await executeSELECTQuery(queryWithGT); - expect(result.length).toEqual(3); - expect(result[0]).toHaveProperty('name'); +test("Execute SQL Query with Not Equal to", async () => { + const queryWithGT = "SELECT name FROM student WHERE age != 25"; + const result = await executeSELECTQuery(queryWithGT); + expect(result.length).toEqual(3); + expect(result[0]).toHaveProperty("name"); }); -test('Parse SQL Query with INNER JOIN', async () => { - const query = 'SELECT student.name, enrollment.course FROM student INNER JOIN enrollment ON student.id=enrollment.student_id'; - const result = await parseQuery(query); - expect(result).toEqual({ - fields: ['student.name', 'enrollment.course'], - table: 'student', - whereClauses: [], - joinTable: 'enrollment', - joinCondition: { left: 'student.id', right: 'enrollment.student_id' }, - joinType: 'INNER' - }) +test("Parse SQL Query with INNER JOIN", async () => { + const query = + "SELECT student.name, enrollment.course FROM student INNER JOIN enrollment ON student.id=enrollment.student_id"; + const result = await parseSelectQuery(query); + expect(result).toEqual({ + fields: ["student.name", "enrollment.course"], + table: "student", + whereClauses: [], + joinTable: "enrollment", + joinCondition: { left: "student.id", right: "enrollment.student_id" }, + joinType: "INNER", + groupByFields: null, + hasAggregateWithoutGroupBy: false, + isDistinct: false, + limit: null, + orderByFields: null, + }); }); -test('Parse SQL Query with INNER JOIN and WHERE Clause', async () => { - const query = 'SELECT student.name, enrollment.course FROM student INNER JOIN enrollment ON student.id = enrollment.student_id WHERE student.age > 20'; - const result = await parseQuery(query); - expect(result).toEqual({ - fields: ['student.name', 'enrollment.course'], - table: 'student', - whereClauses: [{ field: 'student.age', operator: '>', value: '20' }], - joinTable: 'enrollment', - joinCondition: { left: 'student.id', right: 'enrollment.student_id' }, - joinType: 'INNER' - }) +test("Parse SQL Query with INNER JOIN and WHERE Clause", async () => { + const query = + "SELECT student.name, enrollment.course FROM student INNER JOIN enrollment ON student.id = enrollment.student_id WHERE student.age > 20"; + const result = await parseSelectQuery(query); + expect(result).toEqual({ + fields: ["student.name", "enrollment.course"], + table: "student", + whereClauses: [{ field: "student.age", operator: ">", value: "20" }], + joinTable: "enrollment", + joinCondition: { left: "student.id", right: "enrollment.student_id" }, + joinType: "INNER", + groupByFields: null, + hasAggregateWithoutGroupBy: false, + isDistinct: false, + limit: null, + orderByFields: null, + }); }); -test('Execute SQL Query with INNER JOIN', async () => { - const query = 'SELECT student.name, enrollment.course FROM student INNER JOIN enrollment ON student.id=enrollment.student_id'; - const result = await executeSELECTQuery(query); - /* +test("Execute SQL Query with INNER JOIN", async () => { + const query = + "SELECT student.name, enrollment.course FROM student INNER JOIN enrollment ON student.id=enrollment.student_id"; + const result = await executeSELECTQuery(query); + /* result = [ { 'student.name': 'John', 'enrollment.course': 'Mathematics' }, { 'student.name': 'John', 'enrollment.course': 'Physics' }, @@ -138,18 +171,21 @@ test('Execute SQL Query with INNER JOIN', async () => { { 'student.name': 'Bob', 'enrollment.course': 'Mathematics' } ] */ - expect(result.length).toEqual(4); - // toHaveProperty is not working here due to dot in the property name - expect(result[0]).toEqual(expect.objectContaining({ - "enrollment.course": "Mathematics", - "student.name": "John" - })); + expect(result.length).toEqual(4); + // toHaveProperty is not working here due to dot in the property name + expect(result[0]).toEqual( + expect.objectContaining({ + "enrollment.course": "Mathematics", + "student.name": "John", + }) + ); }); -test('Execute SQL Query with INNER JOIN and a WHERE Clause', async () => { - const query = 'SELECT student.name, enrollment.course, student.age FROM student INNER JOIN enrollment ON student.id = enrollment.student_id WHERE student.age > 25'; - const result = await executeSELECTQuery(query); - /* +test("Execute SQL Query with INNER JOIN and a WHERE Clause", async () => { + const query = + "SELECT student.name, enrollment.course, student.age FROM student INNER JOIN enrollment ON student.id = enrollment.student_id WHERE student.age > 25"; + const result = await executeSELECTQuery(query); + /* result = [ { 'student.name': 'John', @@ -163,30 +199,50 @@ test('Execute SQL Query with INNER JOIN and a WHERE Clause', async () => { } ] */ - expect(result.length).toEqual(2); - // toHaveProperty is not working here due to dot in the property name - expect(result[0]).toEqual(expect.objectContaining({ - "enrollment.course": "Mathematics", - "student.name": "John" - })); + expect(result.length).toEqual(2); + // toHaveProperty is not working here due to dot in the property name + expect(result[0]).toEqual( + expect.objectContaining({ + "enrollment.course": "Mathematics", + "student.name": "John", + }) + ); }); -test('Execute SQL Query with LEFT JOIN', async () => { - const query = 'SELECT student.name, enrollment.course FROM student LEFT JOIN enrollment ON student.id=enrollment.student_id'; - const result = await executeSELECTQuery(query); - expect(result).toEqual(expect.arrayContaining([ - expect.objectContaining({ "student.name": "Alice", "enrollment.course": null }), - expect.objectContaining({ "student.name": "John", "enrollment.course": "Mathematics" }) - ])); - expect(result.length).toEqual(5); // 4 students, but John appears twice +test("Execute SQL Query with LEFT JOIN", async () => { + const query = + "SELECT student.name, enrollment.course FROM student LEFT JOIN enrollment ON student.id=enrollment.student_id"; + const result = await executeSELECTQuery(query); + expect(result).toEqual( + expect.arrayContaining([ + expect.objectContaining({ + "student.name": "Alice", + "enrollment.course": null, + }), + expect.objectContaining({ + "student.name": "John", + "enrollment.course": "Mathematics", + }), + ]) + ); + expect(result.length).toEqual(5); // 4 students, but John appears twice }); -test('Execute SQL Query with LEFT JOIN', async () => { - const query = 'SELECT student.name, enrollment.course FROM student LEFT JOIN enrollment ON student.id=enrollment.student_id'; - const result = await executeSELECTQuery(query); - expect(result).toEqual(expect.arrayContaining([ - expect.objectContaining({ "student.name": "Alice", "enrollment.course": null }), - expect.objectContaining({ "student.name": "John", "enrollment.course": "Mathematics" }) - ])); - expect(result.length).toEqual(5); // 4 students, but John appears twice -}); \ No newline at end of file +test("Execute SQL Query with LEFT JOIN", async () => { + const query = + "SELECT student.name, enrollment.course FROM student LEFT JOIN enrollment ON student.id=enrollment.student_id"; + const result = await executeSELECTQuery(query); + expect(result).toEqual( + expect.arrayContaining([ + expect.objectContaining({ + "student.name": "Alice", + "enrollment.course": null, + }), + expect.objectContaining({ + "student.name": "John", + "enrollment.course": "Mathematics", + }), + ]) + ); + expect(result.length).toEqual(5); // 4 students, but John appears twice +}); diff --git a/tests/step-10/index.test.js b/tests/step-10/index.test.js index 5e118eda5..2312d5392 100644 --- a/tests/step-10/index.test.js +++ b/tests/step-10/index.test.js @@ -1,59 +1,60 @@ -const readCSV = require('../../src/csvReader'); -const {parseQuery, parseJoinClause} = require('../../src/queryParser'); -const executeSELECTQuery = require('../../src/index'); - -test('Read CSV File', async () => { - const data = await readCSV('./student.csv'); - expect(data.length).toBeGreaterThan(0); - expect(data.length).toBe(4); - expect(data[0].name).toBe('John'); - expect(data[0].age).toBe('30'); //ignore the string type here, we will fix this later -}); - -test('Execute SQL Query', async () => { - const query = 'SELECT id, name FROM student'; - const result = await executeSELECTQuery(query); - expect(result.length).toBeGreaterThan(0); - expect(result[0]).toHaveProperty('id'); - expect(result[0]).toHaveProperty('name'); - expect(result[0]).not.toHaveProperty('age'); - expect(result[0]).toEqual({ id: '1', name: 'John' }); -}); - -test('Execute SQL Query with WHERE Clause', async () => { - const query = 'SELECT id, name FROM student WHERE age = 25'; - const result = await executeSELECTQuery(query); - expect(result.length).toBe(1); - expect(result[0]).toHaveProperty('id'); - expect(result[0]).toHaveProperty('name'); - expect(result[0].id).toBe('2'); -}); - -test('Execute SQL Query with Complex WHERE Clause', async () => { - const query = 'SELECT id, name FROM student WHERE age = 30 AND name = John'; - const result = await executeSELECTQuery(query); - expect(result.length).toBe(1); - expect(result[0]).toEqual({ id: '1', name: 'John' }); -}); - -test('Execute SQL Query with Greater Than', async () => { - const queryWithGT = 'SELECT id FROM student WHERE age > 22'; - const result = await executeSELECTQuery(queryWithGT); - expect(result.length).toEqual(3); - expect(result[0]).toHaveProperty('id'); -}); - -test('Execute SQL Query with Not Equal to', async () => { - const queryWithGT = 'SELECT name FROM student WHERE age != 25'; - const result = await executeSELECTQuery(queryWithGT); - expect(result.length).toEqual(3); - expect(result[0]).toHaveProperty('name'); -}); - -test('Execute SQL Query with INNER JOIN', async () => { - const query = 'SELECT student.name, enrollment.course FROM student INNER JOIN enrollment ON student.id=enrollment.student_id'; - const result = await executeSELECTQuery(query); - /* +const { readCSV } = require("../../src/csvReader"); +const { parseSelectQuery, parseJoinClause } = require("../../src/queryParser"); +const { executeSELECTQuery } = require("../../src/queryExecutor"); + +test("Read CSV File", async () => { + const data = await readCSV("./student.csv"); + expect(data.length).toBeGreaterThan(0); + expect(data.length).toBe(4); + expect(data[0].name).toBe("John"); + expect(data[0].age).toBe("30"); //ignore the string type here, we will fix this later +}); + +test("Execute SQL Query", async () => { + const query = "SELECT id, name FROM student"; + const result = await executeSELECTQuery(query); + expect(result.length).toBeGreaterThan(0); + expect(result[0]).toHaveProperty("id"); + expect(result[0]).toHaveProperty("name"); + expect(result[0]).not.toHaveProperty("age"); + expect(result[0]).toEqual({ id: "1", name: "John" }); +}); + +test("Execute SQL Query with WHERE Clause", async () => { + const query = "SELECT id, name FROM student WHERE age = 25"; + const result = await executeSELECTQuery(query); + expect(result.length).toBe(1); + expect(result[0]).toHaveProperty("id"); + expect(result[0]).toHaveProperty("name"); + expect(result[0].id).toBe("2"); +}); + +test("Execute SQL Query with Complex WHERE Clause", async () => { + const query = "SELECT id, name FROM student WHERE age = 30 AND name = John"; + const result = await executeSELECTQuery(query); + expect(result.length).toBe(1); + expect(result[0]).toEqual({ id: "1", name: "John" }); +}); + +test("Execute SQL Query with Greater Than", async () => { + const queryWithGT = "SELECT id FROM student WHERE age > 22"; + const result = await executeSELECTQuery(queryWithGT); + expect(result.length).toEqual(3); + expect(result[0]).toHaveProperty("id"); +}); + +test("Execute SQL Query with Not Equal to", async () => { + const queryWithGT = "SELECT name FROM student WHERE age != 25"; + const result = await executeSELECTQuery(queryWithGT); + expect(result.length).toEqual(3); + expect(result[0]).toHaveProperty("name"); +}); + +test("Execute SQL Query with INNER JOIN", async () => { + const query = + "SELECT student.name, enrollment.course FROM student INNER JOIN enrollment ON student.id=enrollment.student_id"; + const result = await executeSELECTQuery(query); + /* result = [ { 'student.name': 'John', 'enrollment.course': 'Mathematics' }, { 'student.name': 'John', 'enrollment.course': 'Physics' }, @@ -61,556 +62,677 @@ test('Execute SQL Query with INNER JOIN', async () => { { 'student.name': 'Bob', 'enrollment.course': 'Mathematics' } ] */ - expect(result.length).toEqual(4); - // toHaveProperty is not working here due to dot in the property name - expect(result[0]).toEqual(expect.objectContaining({ - "enrollment.course": "Mathematics", - "student.name": "John" - })); + expect(result.length).toEqual(4); + // toHaveProperty is not working here due to dot in the property name + expect(result[0]).toEqual( + expect.objectContaining({ + "enrollment.course": "Mathematics", + "student.name": "John", + }) + ); }); -test('Execute SQL Query with INNER JOIN and a WHERE Clause', async () => { - const query = 'SELECT student.name, enrollment.course, student.age FROM student INNER JOIN enrollment ON student.id = enrollment.student_id WHERE student.age > 25'; - const result = await executeSELECTQuery(query); - /* +test("Execute SQL Query with INNER JOIN and a WHERE Clause", async () => { + const query = + "SELECT student.name, enrollment.course, student.age FROM student INNER JOIN enrollment ON student.id = enrollment.student_id WHERE student.age > 25"; + const result = await executeSELECTQuery(query); + /* result = [ { 'student.name': 'John', - 'enrollment.course': 'Mathematics', - 'student.age': '30' - }, - { - 'student.name': 'John', - 'enrollment.course': 'Physics', - 'student.age': '30' + @@ -86,531 +90,655 @@ test('Execute SQL Query with INNER JOIN and a WHERE Clause', async () => { } ] */ - expect(result.length).toEqual(2); - // toHaveProperty is not working here due to dot in the property name - expect(result[0]).toEqual(expect.objectContaining({ - "enrollment.course": "Mathematics", - "student.name": "John" - })); -}); - -test('Execute SQL Query with LEFT JOIN', async () => { - const query = 'SELECT student.name, enrollment.course FROM student LEFT JOIN enrollment ON student.id=enrollment.student_id'; - const result = await executeSELECTQuery(query); - expect(result).toEqual(expect.arrayContaining([ - expect.objectContaining({ "student.name": "Alice", "enrollment.course": null }), - expect.objectContaining({ "student.name": "John", "enrollment.course": "Mathematics" }) - ])); - expect(result.length).toEqual(5); // 4 students, but John appears twice -}); - -test('Execute SQL Query with RIGHT JOIN', async () => { - const query = 'SELECT student.name, enrollment.course FROM student RIGHT JOIN enrollment ON student.id=enrollment.student_id'; - const result = await executeSELECTQuery(query); - expect(result).toEqual(expect.arrayContaining([ - expect.objectContaining({ "student.name": null, "enrollment.course": "Biology" }), - expect.objectContaining({ "student.name": "John", "enrollment.course": "Mathematics" }) - ])); - expect(result.length).toEqual(5); // 4 courses, but Mathematics appears twice -}); - -test('Execute SQL Query with LEFT JOIN with a WHERE clause filtering the main table', async () => { - const query = 'SELECT student.name, enrollment.course FROM student LEFT JOIN enrollment ON student.id=enrollment.student_id WHERE student.age > 22'; - const result = await executeSELECTQuery(query); - expect(result).toEqual(expect.arrayContaining([ - expect.objectContaining({ "enrollment.course": "Mathematics", "student.name": "John" }), - expect.objectContaining({ "enrollment.course": "Physics", "student.name": "John" }) - ])); - expect(result.length).toEqual(4); -}); - -test('Execute SQL Query with LEFT JOIN with a WHERE clause filtering the join table', async () => { - const query = `SELECT student.name, enrollment.course FROM student LEFT JOIN enrollment ON student.id=enrollment.student_id WHERE enrollment.course = 'Physics'`; - const result = await executeSELECTQuery(query); - expect(result).toEqual(expect.arrayContaining([ - expect.objectContaining({ "student.name": "John", "enrollment.course": "Physics" }) - ])); - expect(result.length).toEqual(1); -}); - -test('Execute SQL Query with RIGHT JOIN with a WHERE clause filtering the main table', async () => { - const query = 'SELECT student.name, enrollment.course FROM student RIGHT JOIN enrollment ON student.id=enrollment.student_id WHERE student.age < 25'; - const result = await executeSELECTQuery(query); - expect(result).toEqual(expect.arrayContaining([ - expect.objectContaining({ "enrollment.course": "Mathematics", "student.name": "Bob" }), - expect.objectContaining({ "enrollment.course": "Biology", "student.name": null }) - ])); - expect(result.length).toEqual(2); -}); - -test('Execute SQL Query with RIGHT JOIN with a WHERE clause filtering the join table', async () => { - const query = `SELECT student.name, enrollment.course FROM student RIGHT JOIN enrollment ON student.id=enrollment.student_id WHERE enrollment.course = 'Chemistry'`; - const result = await executeSELECTQuery(query); - expect(result).toEqual(expect.arrayContaining([ - expect.objectContaining({ "enrollment.course": "Chemistry", "student.name": "Jane" }), - ])); - expect(result.length).toEqual(1); -}); - -test('Execute SQL Query with RIGHT JOIN with a multiple WHERE clauses filtering the join table and main table', async () => { - const query = `SELECT student.name, enrollment.course FROM student RIGHT JOIN enrollment ON student.id=enrollment.student_id WHERE enrollment.course = 'Chemistry' AND student.age = 26`; - const result = await executeSELECTQuery(query); - expect(result).toEqual([]); -}); - -test('Execute COUNT Aggregate Query', async () => { - const query = 'SELECT COUNT(*) FROM student'; - const result = await executeSELECTQuery(query); - expect(result).toEqual([{ 'COUNT(*)': 4 }]); -}); - -test('Execute SUM Aggregate Query', async () => { - const query = 'SELECT SUM(age) FROM student'; - const result = await executeSELECTQuery(query); - expect(result).toEqual([{ 'SUM(age)': 101 }]); -}); - -test('Execute AVG Aggregate Query', async () => { - const query = 'SELECT AVG(age) FROM student'; - const result = await executeSELECTQuery(query); - // Assuming AVG returns a single decimal point value - expect(result).toEqual([{ 'AVG(age)': 25.25 }]); -}); - -test('Execute MIN Aggregate Query', async () => { - const query = 'SELECT MIN(age) FROM student'; - const result = await executeSELECTQuery(query); - expect(result).toEqual([{ 'MIN(age)': 22 }]); -}); - -test('Execute MAX Aggregate Query', async () => { - const query = 'SELECT MAX(age) FROM student'; - const result = await executeSELECTQuery(query); - expect(result).toEqual([{ 'MAX(age)': 30 }]); -}); - -test('Count students per age', async () => { - const query = 'SELECT age, COUNT(*) FROM student GROUP BY age'; - const result = await executeSELECTQuery(query); - expect(result).toEqual([ - { age: '22', 'COUNT(*)': 1 }, - { age: '24', 'COUNT(*)': 1 }, - { age: '25', 'COUNT(*)': 1 }, - { age: '30', 'COUNT(*)': 1 } - ]); -}); - -test('Count enrollments per course', async () => { - const query = 'SELECT course, COUNT(*) FROM enrollment GROUP BY course'; - const result = await executeSELECTQuery(query); - expect(result).toEqual([ - { course: 'Mathematics', 'COUNT(*)': 2 }, - { course: 'Physics', 'COUNT(*)': 1 }, - { course: 'Chemistry', 'COUNT(*)': 1 }, - { course: 'Biology', 'COUNT(*)': 1 } - ]); -}); - - -test('Count courses per student', async () => { - const query = 'SELECT student_id, COUNT(*) FROM enrollment GROUP BY student_id'; - const result = await executeSELECTQuery(query); - expect(result).toEqual([ - { student_id: '1', 'COUNT(*)': 2 }, - { student_id: '2', 'COUNT(*)': 1 }, - { student_id: '3', 'COUNT(*)': 1 }, - { student_id: '5', 'COUNT(*)': 1 } - ]); -}); - -test('Count students within a specific age range', async () => { - const query = 'SELECT age, COUNT(*) FROM student WHERE age > 22 GROUP BY age'; - const result = await executeSELECTQuery(query); - expect(result).toEqual([ - { age: '24', 'COUNT(*)': 1 }, - { age: '25', 'COUNT(*)': 1 }, - { age: '30', 'COUNT(*)': 1 } - ]); -}); - -test('Count enrollments for a specific course', async () => { - const query = 'SELECT course, COUNT(*) FROM enrollment WHERE course = "Mathematics" GROUP BY course'; - const result = await executeSELECTQuery(query); - expect(result).toEqual([ - { course: 'Mathematics', 'COUNT(*)': 2 } - ]); -}); - -test('Count courses for a specific student', async () => { - const query = 'SELECT student_id, COUNT(*) FROM enrollment WHERE student_id = 1 GROUP BY student_id'; - const result = await executeSELECTQuery(query); - expect(result).toEqual([ - { student_id: '1', 'COUNT(*)': 2 } - ]); -}); - -test('Average age of students above a certain age', async () => { - const query = 'SELECT AVG(age) FROM student WHERE age > 22'; - const result = await executeSELECTQuery(query); - const expectedAverage = (25 + 30 + 24) / 3; // Average age of students older than 22 - expect(result).toEqual([{ 'AVG(age)': expectedAverage }]); -}); - -test('Parse SQL Query', () => { - const query = 'SELECT id, name FROM student'; - const parsed = parseQuery(query); - expect(parsed).toEqual({ - fields: ['id', 'name'], - table: 'student', - whereClauses: [], - joinCondition: null, - joinTable: null, - joinType: null, - groupByFields: null, - hasAggregateWithoutGroupBy: false, - }); -}); - -test('Parse SQL Query with WHERE Clause', () => { - const query = 'SELECT id, name FROM student WHERE age = 25'; - const parsed = parseQuery(query); - expect(parsed).toEqual({ - fields: ['id', 'name'], - table: 'student', - whereClauses: [{ - "field": "age", - "operator": "=", - "value": "25", - }], - joinCondition: null, - joinTable: null, - joinType: null, - groupByFields: null, - hasAggregateWithoutGroupBy: false, - }); -}); - -test('Parse SQL Query with Multiple WHERE Clauses', () => { - const query = 'SELECT id, name FROM student WHERE age = 30 AND name = John'; - const parsed = parseQuery(query); - expect(parsed).toEqual({ - fields: ['id', 'name'], - table: 'student', - whereClauses: [{ - "field": "age", - "operator": "=", - "value": "30", - }, { - "field": "name", - "operator": "=", - "value": "John", - }], - joinCondition: null, - joinTable: null, - joinType: null, - groupByFields: null, - hasAggregateWithoutGroupBy: false, - }); -}); - -test('Parse SQL Query with INNER JOIN', async () => { - const query = 'SELECT student.name, enrollment.course FROM student INNER JOIN enrollment ON student.id=enrollment.student_id'; - const result = await parseQuery(query); - expect(result).toEqual({ - fields: ['student.name', 'enrollment.course'], - table: 'student', - whereClauses: [], - joinTable: 'enrollment', - joinType: "INNER", - joinCondition: { left: 'student.id', right: 'enrollment.student_id' }, - groupByFields: null, - hasAggregateWithoutGroupBy: false, - }) -}); - -test('Parse SQL Query with INNER JOIN and WHERE Clause', async () => { - const query = 'SELECT student.name, enrollment.course FROM student INNER JOIN enrollment ON student.id = enrollment.student_id WHERE student.age > 20'; - const result = await parseQuery(query); - expect(result).toEqual({ - fields: ['student.name', 'enrollment.course'], - table: 'student', - whereClauses: [{ field: 'student.age', operator: '>', value: '20' }], - joinTable: 'enrollment', - joinType: "INNER", - joinCondition: { left: 'student.id', right: 'enrollment.student_id' }, - groupByFields: null, - hasAggregateWithoutGroupBy: false, + expect(result.length).toEqual(2); + // toHaveProperty is not working here due to dot in the property name + expect(result[0]).toEqual( + expect.objectContaining({ + "enrollment.course": "Mathematics", + "student.name": "John", }) + ); +}); + +test("Execute SQL Query with LEFT JOIN", async () => { + const query = + "SELECT student.name, enrollment.course FROM student LEFT JOIN enrollment ON student.id=enrollment.student_id"; + const result = await executeSELECTQuery(query); + expect(result).toEqual( + expect.arrayContaining([ + expect.objectContaining({ + "student.name": "Alice", + "enrollment.course": null, + }), + expect.objectContaining({ + "student.name": "John", + "enrollment.course": "Mathematics", + }), + ]) + ); + expect(result.length).toEqual(5); // 4 students, but John appears twice +}); + +test("Execute SQL Query with RIGHT JOIN", async () => { + const query = + "SELECT student.name, enrollment.course FROM student RIGHT JOIN enrollment ON student.id=enrollment.student_id"; + const result = await executeSELECTQuery(query); + expect(result).toEqual( + expect.arrayContaining([ + expect.objectContaining({ + "student.name": null, + "enrollment.course": "Biology", + }), + expect.objectContaining({ + "student.name": "John", + "enrollment.course": "Mathematics", + }), + ]) + ); + expect(result.length).toEqual(5); // 4 courses, but Mathematics appears twice +}); + +test("Execute SQL Query with LEFT JOIN with a WHERE clause filtering the main table", async () => { + const query = + "SELECT student.name, enrollment.course FROM student LEFT JOIN enrollment ON student.id=enrollment.student_id WHERE student.age > 22"; + const result = await executeSELECTQuery(query); + expect(result).toEqual( + expect.arrayContaining([ + expect.objectContaining({ + "enrollment.course": "Mathematics", + "student.name": "John", + }), + expect.objectContaining({ + "enrollment.course": "Physics", + "student.name": "John", + }), + ]) + ); + expect(result.length).toEqual(4); +}); + +test("Execute SQL Query with LEFT JOIN with a WHERE clause filtering the join table", async () => { + const query = `SELECT student.name, enrollment.course FROM student LEFT JOIN enrollment ON student.id=enrollment.student_id WHERE enrollment.course = 'Physics'`; + const result = await executeSELECTQuery(query); + expect(result).toEqual( + expect.arrayContaining([ + expect.objectContaining({ + "student.name": "John", + "enrollment.course": "Physics", + }), + ]) + ); + expect(result.length).toEqual(1); +}); + +test("Execute SQL Query with RIGHT JOIN with a WHERE clause filtering the main table", async () => { + const query = + "SELECT student.name, enrollment.course FROM student RIGHT JOIN enrollment ON student.id=enrollment.student_id WHERE student.age < 25"; + const result = await executeSELECTQuery(query); + expect(result).toEqual( + expect.arrayContaining([ + expect.objectContaining({ + "enrollment.course": "Mathematics", + "student.name": "Bob", + }), + expect.objectContaining({ + "enrollment.course": "Biology", + "student.name": null, + }), + ]) + ); + expect(result.length).toEqual(2); +}); + +test("Execute SQL Query with RIGHT JOIN with a WHERE clause filtering the join table", async () => { + const query = `SELECT student.name, enrollment.course FROM student RIGHT JOIN enrollment ON student.id=enrollment.student_id WHERE enrollment.course = 'Chemistry'`; + const result = await executeSELECTQuery(query); + expect(result).toEqual( + expect.arrayContaining([ + expect.objectContaining({ + "enrollment.course": "Chemistry", + "student.name": "Jane", + }), + ]) + ); + expect(result.length).toEqual(1); +}); + +test("Execute SQL Query with RIGHT JOIN with a multiple WHERE clauses filtering the join table and main table", async () => { + const query = `SELECT student.name, enrollment.course FROM student RIGHT JOIN enrollment ON student.id=enrollment.student_id WHERE enrollment.course = 'Chemistry' AND student.age = 26`; + const result = await executeSELECTQuery(query); + expect(result).toEqual([]); +}); + +test("Execute COUNT Aggregate Query", async () => { + const query = "SELECT COUNT(*) FROM student"; + const result = await executeSELECTQuery(query); + expect(result).toEqual([{ "COUNT(*)": 4 }]); +}); + +test("Execute SUM Aggregate Query", async () => { + const query = "SELECT SUM(age) FROM student"; + const result = await executeSELECTQuery(query); + expect(result).toEqual([{ "SUM(age)": 101 }]); +}); + +test("Execute AVG Aggregate Query", async () => { + const query = "SELECT AVG(age) FROM student"; + const result = await executeSELECTQuery(query); + // Assuming AVG returns a single decimal point value + expect(result).toEqual([{ "AVG(age)": 25.25 }]); +}); + +test("Execute MIN Aggregate Query", async () => { + const query = "SELECT MIN(age) FROM student"; + const result = await executeSELECTQuery(query); + expect(result).toEqual([{ "MIN(age)": 22 }]); +}); + +test("Execute MAX Aggregate Query", async () => { + const query = "SELECT MAX(age) FROM student"; + const result = await executeSELECTQuery(query); + expect(result).toEqual([{ "MAX(age)": 30 }]); +}); + +test("Count students per age", async () => { + const query = "SELECT age, COUNT(*) FROM student GROUP BY age"; + const result = await executeSELECTQuery(query); + expect(result).toEqual([ + { age: "22", "COUNT(*)": 1 }, + { age: "24", "COUNT(*)": 1 }, + { age: "25", "COUNT(*)": 1 }, + { age: "30", "COUNT(*)": 1 }, + ]); +}); + +test("Count enrollments per course", async () => { + const query = "SELECT course, COUNT(*) FROM enrollment GROUP BY course"; + const result = await executeSELECTQuery(query); + expect(result).toEqual([ + { course: "Mathematics", "COUNT(*)": 2 }, + { course: "Physics", "COUNT(*)": 1 }, + { course: "Chemistry", "COUNT(*)": 1 }, + { course: "Biology", "COUNT(*)": 1 }, + ]); +}); + +test("Count courses per student", async () => { + const query = + "SELECT student_id, COUNT(*) FROM enrollment GROUP BY student_id"; + const result = await executeSELECTQuery(query); + expect(result).toEqual([ + { student_id: "1", "COUNT(*)": 2 }, + { student_id: "2", "COUNT(*)": 1 }, + { student_id: "3", "COUNT(*)": 1 }, + { student_id: "5", "COUNT(*)": 1 }, + ]); +}); + +test("Count students within a specific age range", async () => { + const query = "SELECT age, COUNT(*) FROM student WHERE age > 22 GROUP BY age"; + const result = await executeSELECTQuery(query); + expect(result).toEqual([ + { age: "24", "COUNT(*)": 1 }, + { age: "25", "COUNT(*)": 1 }, + { age: "30", "COUNT(*)": 1 }, + ]); +}); + +test("Count enrollments for a specific course", async () => { + const query = + 'SELECT course, COUNT(*) FROM enrollment WHERE course = "Mathematics" GROUP BY course'; + const result = await executeSELECTQuery(query); + expect(result).toEqual([{ course: "Mathematics", "COUNT(*)": 2 }]); +}); + +test("Count courses for a specific student", async () => { + const query = + "SELECT student_id, COUNT(*) FROM enrollment WHERE student_id = 1 GROUP BY student_id"; + const result = await executeSELECTQuery(query); + expect(result).toEqual([{ student_id: "1", "COUNT(*)": 2 }]); +}); + +test("Average age of students above a certain age", async () => { + const query = "SELECT AVG(age) FROM student WHERE age > 22"; + const result = await executeSELECTQuery(query); + const expectedAverage = (25 + 30 + 24) / 3; // Average age of students older than 22 + expect(result).toEqual([{ "AVG(age)": expectedAverage }]); +}); + +test("Parse SQL Query", () => { + const query = "SELECT id, name FROM student"; + const parsed = parseSelectQuery(query); + expect(parsed).toEqual({ + fields: ["id", "name"], + table: "student", + whereClauses: [], + joinCondition: null, + joinTable: null, + joinType: null, + groupByFields: null, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse SQL Query with WHERE Clause", () => { + const query = "SELECT id, name FROM student WHERE age = 25"; + const parsed = parseSelectQuery(query); + expect(parsed).toEqual({ + fields: ["id", "name"], + table: "student", + whereClauses: [ + { + field: "age", + operator: "=", + value: "25", + }, + ], + joinCondition: null, + joinTable: null, + joinType: null, + groupByFields: null, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse SQL Query with Multiple WHERE Clauses", () => { + const query = "SELECT id, name FROM student WHERE age = 30 AND name = John"; + const parsed = parseSelectQuery(query); + expect(parsed).toEqual({ + fields: ["id", "name"], + table: "student", + whereClauses: [ + { + field: "age", + operator: "=", + value: "30", + }, + { + field: "name", + operator: "=", + value: "John", + }, + ], + joinCondition: null, + joinTable: null, + joinType: null, + groupByFields: null, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse SQL Query with INNER JOIN", async () => { + const query = + "SELECT student.name, enrollment.course FROM student INNER JOIN enrollment ON student.id=enrollment.student_id"; + const result = await parseSelectQuery(query); + expect(result).toEqual({ + fields: ["student.name", "enrollment.course"], + table: "student", + whereClauses: [], + joinTable: "enrollment", + joinType: "INNER", + joinCondition: { left: "student.id", right: "enrollment.student_id" }, + groupByFields: null, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse SQL Query with INNER JOIN and WHERE Clause", async () => { + const query = + "SELECT student.name, enrollment.course FROM student INNER JOIN enrollment ON student.id = enrollment.student_id WHERE student.age > 20"; + const result = await parseSelectQuery(query); + expect(result).toEqual({ + fields: ["student.name", "enrollment.course"], + table: "student", + whereClauses: [{ field: "student.age", operator: ">", value: "20" }], + joinTable: "enrollment", + joinType: "INNER", + joinCondition: { left: "student.id", right: "enrollment.student_id" }, + groupByFields: null, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse INNER JOIN clause", () => { + const query = + "SELECT * FROM table1 INNER JOIN table2 ON table1.id = table2.ref_id"; + const result = parseJoinClause(query); + expect(result).toEqual({ + joinType: "INNER", + joinTable: "table2", + joinCondition: { left: "table1.id", right: "table2.ref_id" }, + }); +}); + +test("Parse LEFT JOIN clause", () => { + const query = + "SELECT * FROM table1 LEFT JOIN table2 ON table1.id = table2.ref_id"; + const result = parseJoinClause(query); + expect(result).toEqual({ + joinType: "LEFT", + joinTable: "table2", + joinCondition: { left: "table1.id", right: "table2.ref_id" }, + }); +}); + +test("Parse RIGHT JOIN clause", () => { + const query = + "SELECT * FROM table1 RIGHT JOIN table2 ON table1.id = table2.ref_id"; + const result = parseJoinClause(query); + expect(result).toEqual({ + joinType: "RIGHT", + joinTable: "table2", + joinCondition: { left: "table1.id", right: "table2.ref_id" }, + }); +}); + +test("Returns null for queries without JOIN", () => { + const query = "SELECT * FROM table1"; + const result = parseJoinClause(query); + expect(result).toEqual({ + joinType: null, + joinTable: null, + joinCondition: null, + }); +}); + +test("Parse LEFT Join Query Completely", () => { + const query = + "SELECT student.name, enrollment.course FROM student LEFT JOIN enrollment ON student.id=enrollment.student_id"; + const result = parseSelectQuery(query); + expect(result).toEqual({ + fields: ["student.name", "enrollment.course"], + table: "student", + whereClauses: [], + joinType: "LEFT", + joinTable: "enrollment", + joinCondition: { left: "student.id", right: "enrollment.student_id" }, + groupByFields: null, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse LEFT Join Query Completely", () => { + const query = + "SELECT student.name, enrollment.course FROM student RIGHT JOIN enrollment ON student.id=enrollment.student_id"; + const result = parseSelectQuery(query); + expect(result).toEqual({ + fields: ["student.name", "enrollment.course"], + table: "student", + whereClauses: [], + joinType: "RIGHT", + joinTable: "enrollment", + joinCondition: { left: "student.id", right: "enrollment.student_id" }, + groupByFields: null, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse SQL Query with LEFT JOIN with a WHERE clause filtering the main table", async () => { + const query = + "SELECT student.name, enrollment.course FROM student LEFT JOIN enrollment ON student.id=enrollment.student_id WHERE student.age > 22"; + const result = await parseSelectQuery(query); + expect(result).toEqual({ + fields: ["student.name", "enrollment.course"], + joinCondition: { left: "student.id", right: "enrollment.student_id" }, + joinTable: "enrollment", + joinType: "LEFT", + table: "student", + whereClauses: [{ field: "student.age", operator: ">", value: "22" }], + groupByFields: null, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse SQL Query with LEFT JOIN with a WHERE clause filtering the join table", async () => { + const query = `SELECT student.name, enrollment.course FROM student LEFT JOIN enrollment ON student.id=enrollment.student_id WHERE enrollment.course = 'Physics'`; + const result = await parseSelectQuery(query); + expect(result).toEqual({ + fields: ["student.name", "enrollment.course"], + joinCondition: { left: "student.id", right: "enrollment.student_id" }, + joinTable: "enrollment", + joinType: "LEFT", + table: "student", + whereClauses: [ + { field: "enrollment.course", operator: "=", value: "'Physics'" }, + ], + groupByFields: null, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse SQL Query with RIGHT JOIN with a WHERE clause filtering the main table", async () => { + const query = + "SELECT student.name, enrollment.course FROM student RIGHT JOIN enrollment ON student.id=enrollment.student_id WHERE student.age < 25"; + const result = await parseSelectQuery(query); + expect(result).toEqual({ + fields: ["student.name", "enrollment.course"], + joinCondition: { left: "student.id", right: "enrollment.student_id" }, + joinTable: "enrollment", + joinType: "RIGHT", + table: "student", + whereClauses: [{ field: "student.age", operator: "<", value: "25" }], + groupByFields: null, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse SQL Query with RIGHT JOIN with a WHERE clause filtering the join table", async () => { + const query = `SELECT student.name, enrollment.course FROM student RIGHT JOIN enrollment ON student.id=enrollment.student_id WHERE enrollment.course = 'Chemistry'`; + const result = await parseSelectQuery(query); + expect(result).toEqual({ + fields: ["student.name", "enrollment.course"], + joinCondition: { left: "student.id", right: "enrollment.student_id" }, + joinTable: "enrollment", + joinType: "RIGHT", + table: "student", + whereClauses: [ + { field: "enrollment.course", operator: "=", value: "'Chemistry'" }, + ], + groupByFields: null, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse COUNT Aggregate Query", () => { + const query = "SELECT COUNT(*) FROM student"; + const parsed = parseSelectQuery(query); + expect(parsed).toEqual({ + fields: ["COUNT(*)"], + table: "student", + whereClauses: [], + groupByFields: null, + hasAggregateWithoutGroupBy: true, + joinCondition: null, + joinTable: null, + joinType: null, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse SUM Aggregate Query", () => { + const query = "SELECT SUM(age) FROM student"; + const parsed = parseSelectQuery(query); + expect(parsed).toEqual({ + fields: ["SUM(age)"], + table: "student", + whereClauses: [], + groupByFields: null, + hasAggregateWithoutGroupBy: true, + joinCondition: null, + joinTable: null, + joinType: null, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse AVG Aggregate Query", () => { + const query = "SELECT AVG(age) FROM student"; + const parsed = parseSelectQuery(query); + expect(parsed).toEqual({ + fields: ["AVG(age)"], + table: "student", + whereClauses: [], + groupByFields: null, + hasAggregateWithoutGroupBy: true, + joinCondition: null, + joinTable: null, + joinType: null, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse MIN Aggregate Query", () => { + const query = "SELECT MIN(age) FROM student"; + const parsed = parseSelectQuery(query); + expect(parsed).toEqual({ + fields: ["MIN(age)"], + table: "student", + whereClauses: [], + groupByFields: null, + hasAggregateWithoutGroupBy: true, + joinCondition: null, + joinTable: null, + joinType: null, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse MAX Aggregate Query", () => { + const query = "SELECT MAX(age) FROM student"; + const parsed = parseSelectQuery(query); + expect(parsed).toEqual({ + fields: ["MAX(age)"], + table: "student", + whereClauses: [], + groupByFields: null, + hasAggregateWithoutGroupBy: true, + joinCondition: null, + joinTable: null, + joinType: null, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse basic GROUP BY query", () => { + const query = "SELECT age, COUNT(*) FROM student GROUP BY age"; + const parsed = parseSelectQuery(query); + expect(parsed).toEqual({ + fields: ["age", "COUNT(*)"], + table: "student", + whereClauses: [], + groupByFields: ["age"], + joinType: null, + joinTable: null, + joinCondition: null, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse GROUP BY query with WHERE clause", () => { + const query = "SELECT age, COUNT(*) FROM student WHERE age > 22 GROUP BY age"; + const parsed = parseSelectQuery(query); + expect(parsed).toEqual({ + fields: ["age", "COUNT(*)"], + table: "student", + whereClauses: [{ field: "age", operator: ">", value: "22" }], + groupByFields: ["age"], + joinType: null, + joinTable: null, + joinCondition: null, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse GROUP BY query with multiple fields", () => { + const query = + "SELECT student_id, course, COUNT(*) FROM enrollment GROUP BY student_id, course"; + const parsed = parseSelectQuery(query); + expect(parsed).toEqual({ + fields: ["student_id", "course", "COUNT(*)"], + table: "enrollment", + whereClauses: [], + groupByFields: ["student_id", "course"], + joinType: null, + joinTable: null, + joinCondition: null, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse GROUP BY query with JOIN and WHERE clauses", () => { + const query = + 'SELECT student.name, COUNT(*) FROM student INNER JOIN enrollment ON student.id = enrollment.student_id WHERE enrollment.course = "Mathematics" GROUP BY student.name'; + const parsed = parseSelectQuery(query); + expect(parsed).toEqual({ + fields: ["student.name", "COUNT(*)"], + table: "student", + whereClauses: [ + { field: "enrollment.course", operator: "=", value: '"Mathematics"' }, + ], + groupByFields: ["student.name"], + joinType: "INNER", + joinTable: "enrollment", + joinCondition: { + left: "student.id", + right: "enrollment.student_id", + }, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); }); - -test('Parse INNER JOIN clause', () => { - const query = 'SELECT * FROM table1 INNER JOIN table2 ON table1.id = table2.ref_id'; - const result = parseJoinClause(query); - expect(result).toEqual({ - joinType: 'INNER', - joinTable: 'table2', - joinCondition: { left: 'table1.id', right: 'table2.ref_id' }, - }); -}); - -test('Parse LEFT JOIN clause', () => { - const query = 'SELECT * FROM table1 LEFT JOIN table2 ON table1.id = table2.ref_id'; - const result = parseJoinClause(query); - expect(result).toEqual({ - joinType: 'LEFT', - joinTable: 'table2', - joinCondition: { left: 'table1.id', right: 'table2.ref_id' } - }); -}); - -test('Parse RIGHT JOIN clause', () => { - const query = 'SELECT * FROM table1 RIGHT JOIN table2 ON table1.id = table2.ref_id'; - const result = parseJoinClause(query); - expect(result).toEqual({ - joinType: 'RIGHT', - joinTable: 'table2', - joinCondition: { left: 'table1.id', right: 'table2.ref_id' } - }); -}); - -test('Returns null for queries without JOIN', () => { - const query = 'SELECT * FROM table1'; - const result = parseJoinClause(query); - expect(result).toEqual( - { - joinType: null, - joinTable: null, - joinCondition: null - } - ); -}); - -test('Parse LEFT Join Query Completely', () => { - const query = 'SELECT student.name, enrollment.course FROM student LEFT JOIN enrollment ON student.id=enrollment.student_id'; - const result = parseQuery(query); - expect(result).toEqual({ - fields: ['student.name', 'enrollment.course'], - table: 'student', - whereClauses: [], - joinType: 'LEFT', - joinTable: 'enrollment', - joinCondition: { left: 'student.id', right: 'enrollment.student_id' }, - groupByFields: null, - hasAggregateWithoutGroupBy: false, - }) -}) - -test('Parse LEFT Join Query Completely', () => { - const query = 'SELECT student.name, enrollment.course FROM student RIGHT JOIN enrollment ON student.id=enrollment.student_id'; - const result = parseQuery(query); - expect(result).toEqual({ - fields: ['student.name', 'enrollment.course'], - table: 'student', - whereClauses: [], - joinType: 'RIGHT', - joinTable: 'enrollment', - joinCondition: { left: 'student.id', right: 'enrollment.student_id' }, - groupByFields: null, - hasAggregateWithoutGroupBy: false, - }) -}) - -test('Parse SQL Query with LEFT JOIN with a WHERE clause filtering the main table', async () => { - const query = 'SELECT student.name, enrollment.course FROM student LEFT JOIN enrollment ON student.id=enrollment.student_id WHERE student.age > 22'; - const result = await parseQuery(query); - expect(result).toEqual({ - "fields": ["student.name", "enrollment.course"], - "joinCondition": { "left": "student.id", "right": "enrollment.student_id" }, - "joinTable": "enrollment", - "joinType": "LEFT", - "table": "student", - "whereClauses": [{ "field": "student.age", "operator": ">", "value": "22" }], - groupByFields: null, - hasAggregateWithoutGroupBy: false, - }); -}); - -test('Parse SQL Query with LEFT JOIN with a WHERE clause filtering the join table', async () => { - const query = `SELECT student.name, enrollment.course FROM student LEFT JOIN enrollment ON student.id=enrollment.student_id WHERE enrollment.course = 'Physics'`; - const result = await parseQuery(query); - expect(result).toEqual({ - "fields": ["student.name", "enrollment.course"], - "joinCondition": { "left": "student.id", "right": "enrollment.student_id" }, - "joinTable": "enrollment", - "joinType": "LEFT", - "table": "student", - "whereClauses": [{ "field": "enrollment.course", "operator": "=", "value": "'Physics'" }], - groupByFields: null, - hasAggregateWithoutGroupBy: false, - }); -}); - -test('Parse SQL Query with RIGHT JOIN with a WHERE clause filtering the main table', async () => { - const query = 'SELECT student.name, enrollment.course FROM student RIGHT JOIN enrollment ON student.id=enrollment.student_id WHERE student.age < 25'; - const result = await parseQuery(query); - expect(result).toEqual({ - "fields": ["student.name", "enrollment.course"], - "joinCondition": { "left": "student.id", "right": "enrollment.student_id" }, - "joinTable": "enrollment", - "joinType": "RIGHT", - "table": "student", - "whereClauses": [{ "field": "student.age", "operator": "<", "value": "25" }], - groupByFields: null, - hasAggregateWithoutGroupBy: false, - }); -}); - -test('Parse SQL Query with RIGHT JOIN with a WHERE clause filtering the join table', async () => { - const query = `SELECT student.name, enrollment.course FROM student RIGHT JOIN enrollment ON student.id=enrollment.student_id WHERE enrollment.course = 'Chemistry'`; - const result = await parseQuery(query); - expect(result).toEqual({ - "fields": ["student.name", "enrollment.course"], - "joinCondition": { "left": "student.id", "right": "enrollment.student_id" }, - "joinTable": "enrollment", - "joinType": "RIGHT", - "table": "student", - "whereClauses": [{ "field": "enrollment.course", "operator": "=", "value": "'Chemistry'" }], - groupByFields: null, - hasAggregateWithoutGroupBy: false, - }); -}); - - -test('Parse COUNT Aggregate Query', () => { - const query = 'SELECT COUNT(*) FROM student'; - const parsed = parseQuery(query); - expect(parsed).toEqual({ - fields: ['COUNT(*)'], - table: 'student', - whereClauses: [], - groupByFields: null, - hasAggregateWithoutGroupBy: true, - "joinCondition": null, - "joinTable": null, - "joinType": null, - }); -}); - - -test('Parse SUM Aggregate Query', () => { - const query = 'SELECT SUM(age) FROM student'; - const parsed = parseQuery(query); - expect(parsed).toEqual({ - fields: ['SUM(age)'], - table: 'student', - whereClauses: [], - groupByFields: null, - hasAggregateWithoutGroupBy: true, - "joinCondition": null, - "joinTable": null, - "joinType": null, - }); -}); - -test('Parse AVG Aggregate Query', () => { - const query = 'SELECT AVG(age) FROM student'; - const parsed = parseQuery(query); - expect(parsed).toEqual({ - fields: ['AVG(age)'], - table: 'student', - whereClauses: [], - groupByFields: null, - hasAggregateWithoutGroupBy: true, - "joinCondition": null, - "joinTable": null, - "joinType": null, - }); -}); - -test('Parse MIN Aggregate Query', () => { - const query = 'SELECT MIN(age) FROM student'; - const parsed = parseQuery(query); - expect(parsed).toEqual({ - fields: ['MIN(age)'], - table: 'student', - whereClauses: [], - groupByFields: null, - hasAggregateWithoutGroupBy: true, - "joinCondition": null, - "joinTable": null, - "joinType": null, - }); -}); - -test('Parse MAX Aggregate Query', () => { - const query = 'SELECT MAX(age) FROM student'; - const parsed = parseQuery(query); - expect(parsed).toEqual({ - fields: ['MAX(age)'], - table: 'student', - whereClauses: [], - groupByFields: null, - hasAggregateWithoutGroupBy: true, - "joinCondition": null, - "joinTable": null, - "joinType": null, - }); -}); - -test('Parse basic GROUP BY query', () => { - const query = 'SELECT age, COUNT(*) FROM student GROUP BY age'; - const parsed = parseQuery(query); - expect(parsed).toEqual({ - fields: ['age', 'COUNT(*)'], - table: 'student', - whereClauses: [], - groupByFields: ['age'], - joinType: null, - joinTable: null, - joinCondition: null, - hasAggregateWithoutGroupBy: false - }); -}); - -test('Parse GROUP BY query with WHERE clause', () => { - const query = 'SELECT age, COUNT(*) FROM student WHERE age > 22 GROUP BY age'; - const parsed = parseQuery(query); - expect(parsed).toEqual({ - fields: ['age', 'COUNT(*)'], - table: 'student', - whereClauses: [{ field: 'age', operator: '>', value: '22' }], - groupByFields: ['age'], - joinType: null, - joinTable: null, - joinCondition: null, - hasAggregateWithoutGroupBy: false - }); -}); - -test('Parse GROUP BY query with multiple fields', () => { - const query = 'SELECT student_id, course, COUNT(*) FROM enrollment GROUP BY student_id, course'; - const parsed = parseQuery(query); - expect(parsed).toEqual({ - fields: ['student_id', 'course', 'COUNT(*)'], - table: 'enrollment', - whereClauses: [], - groupByFields: ['student_id', 'course'], - joinType: null, - joinTable: null, - joinCondition: null, - hasAggregateWithoutGroupBy: false - }); -}); - -test('Parse GROUP BY query with JOIN and WHERE clauses', () => { - const query = 'SELECT student.name, COUNT(*) FROM student INNER JOIN enrollment ON student.id = enrollment.student_id WHERE enrollment.course = "Mathematics" GROUP BY student.name'; - const parsed = parseQuery(query); - expect(parsed).toEqual({ - fields: ['student.name', 'COUNT(*)'], - table: 'student', - whereClauses: [{ field: 'enrollment.course', operator: '=', value: '"Mathematics"' }], - groupByFields: ['student.name'], - joinType: 'INNER', - joinTable: 'enrollment', - joinCondition: { - left: 'student.id', - right: 'enrollment.student_id' - }, - hasAggregateWithoutGroupBy: false - }); -}); \ No newline at end of file diff --git a/tests/step-11/index.test.js b/tests/step-11/index.test.js index 1cf5f2def..391805fe4 100644 --- a/tests/step-11/index.test.js +++ b/tests/step-11/index.test.js @@ -1,59 +1,60 @@ -const readCSV = require('../../src/csvReader'); -const {parseQuery, parseJoinClause} = require('../../src/queryParser'); -const executeSELECTQuery = require('../../src/index'); - -test('Read CSV File', async () => { - const data = await readCSV('./student.csv'); - expect(data.length).toBeGreaterThan(0); - expect(data.length).toBe(4); - expect(data[0].name).toBe('John'); - expect(data[0].age).toBe('30'); //ignore the string type here, we will fix this later -}); - -test('Execute SQL Query', async () => { - const query = 'SELECT id, name FROM student'; - const result = await executeSELECTQuery(query); - expect(result.length).toBeGreaterThan(0); - expect(result[0]).toHaveProperty('id'); - expect(result[0]).toHaveProperty('name'); - expect(result[0]).not.toHaveProperty('age'); - expect(result[0]).toEqual({ id: '1', name: 'John' }); -}); - -test('Execute SQL Query with WHERE Clause', async () => { - const query = 'SELECT id, name FROM student WHERE age = 25'; - const result = await executeSELECTQuery(query); - expect(result.length).toBe(1); - expect(result[0]).toHaveProperty('id'); - expect(result[0]).toHaveProperty('name'); - expect(result[0].id).toBe('2'); -}); - -test('Execute SQL Query with Complex WHERE Clause', async () => { - const query = 'SELECT id, name FROM student WHERE age = 30 AND name = John'; - const result = await executeSELECTQuery(query); - expect(result.length).toBe(1); - expect(result[0]).toEqual({ id: '1', name: 'John' }); -}); - -test('Execute SQL Query with Greater Than', async () => { - const queryWithGT = 'SELECT id FROM student WHERE age > 22'; - const result = await executeSELECTQuery(queryWithGT); - expect(result.length).toEqual(3); - expect(result[0]).toHaveProperty('id'); -}); - -test('Execute SQL Query with Not Equal to', async () => { - const queryWithGT = 'SELECT name FROM student WHERE age != 25'; - const result = await executeSELECTQuery(queryWithGT); - expect(result.length).toEqual(3); - expect(result[0]).toHaveProperty('name'); -}); - -test('Execute SQL Query with INNER JOIN', async () => { - const query = 'SELECT student.name, enrollment.course FROM student INNER JOIN enrollment ON student.id=enrollment.student_id'; - const result = await executeSELECTQuery(query); - /* +const { readCSV } = require("../../src/csvReader"); +const { parseSelectQuery, parseJoinClause } = require("../../src/queryParser"); +const { executeSELECTQuery } = require("../../src/queryExecutor"); + +test("Read CSV File", async () => { + const data = await readCSV("./student.csv"); + expect(data.length).toBeGreaterThan(0); + expect(data.length).toBe(4); + expect(data[0].name).toBe("John"); + expect(data[0].age).toBe("30"); //ignore the string type here, we will fix this later +}); + +test("Execute SQL Query", async () => { + const query = "SELECT id, name FROM student"; + const result = await executeSELECTQuery(query); + expect(result.length).toBeGreaterThan(0); + expect(result[0]).toHaveProperty("id"); + expect(result[0]).toHaveProperty("name"); + expect(result[0]).not.toHaveProperty("age"); + expect(result[0]).toEqual({ id: "1", name: "John" }); +}); + +test("Execute SQL Query with WHERE Clause", async () => { + const query = "SELECT id, name FROM student WHERE age = 25"; + const result = await executeSELECTQuery(query); + expect(result.length).toBe(1); + expect(result[0]).toHaveProperty("id"); + expect(result[0]).toHaveProperty("name"); + expect(result[0].id).toBe("2"); +}); + +test("Execute SQL Query with Complex WHERE Clause", async () => { + const query = "SELECT id, name FROM student WHERE age = 30 AND name = John"; + const result = await executeSELECTQuery(query); + expect(result.length).toBe(1); + expect(result[0]).toEqual({ id: "1", name: "John" }); +}); + +test("Execute SQL Query with Greater Than", async () => { + const queryWithGT = "SELECT id FROM student WHERE age > 22"; + const result = await executeSELECTQuery(queryWithGT); + expect(result.length).toEqual(3); + expect(result[0]).toHaveProperty("id"); +}); + +test("Execute SQL Query with Not Equal to", async () => { + const queryWithGT = "SELECT name FROM student WHERE age != 25"; + const result = await executeSELECTQuery(queryWithGT); + expect(result.length).toEqual(3); + expect(result[0]).toHaveProperty("name"); +}); + +test("Execute SQL Query with INNER JOIN", async () => { + const query = + "SELECT student.name, enrollment.course FROM student INNER JOIN enrollment ON student.id=enrollment.student_id"; + const result = await executeSELECTQuery(query); + /* result = [ { 'student.name': 'John', 'enrollment.course': 'Mathematics' }, { 'student.name': 'John', 'enrollment.course': 'Physics' }, @@ -61,609 +62,708 @@ test('Execute SQL Query with INNER JOIN', async () => { { 'student.name': 'Bob', 'enrollment.course': 'Mathematics' } ] */ - expect(result.length).toEqual(4); - // toHaveProperty is not working here due to dot in the property name - expect(result[0]).toEqual(expect.objectContaining({ - "enrollment.course": "Mathematics", - "student.name": "John" - })); + expect(result.length).toEqual(4); + // toHaveProperty is not working here due to dot in the property name + expect(result[0]).toEqual( + expect.objectContaining({ + "enrollment.course": "Mathematics", + "student.name": "John", + }) + ); }); -test('Execute SQL Query with INNER JOIN and a WHERE Clause', async () => { - const query = 'SELECT student.name, enrollment.course, student.age FROM student INNER JOIN enrollment ON student.id = enrollment.student_id WHERE student.age > 25'; - const result = await executeSELECTQuery(query); - /* +test("Execute SQL Query with INNER JOIN and a WHERE Clause", async () => { + const query = + "SELECT student.name, enrollment.course, student.age FROM student INNER JOIN enrollment ON student.id = enrollment.student_id WHERE student.age > 25"; + const result = await executeSELECTQuery(query); + /* result = [ { 'student.name': 'John', - 'enrollment.course': 'Mathematics', - 'student.age': '30' - }, - { - 'student.name': 'John', - 'enrollment.course': 'Physics', - 'student.age': '30' + @@ -86,584 +90,686 @@ test('Execute SQL Query with INNER JOIN and a WHERE Clause', async () => { } ] */ - expect(result.length).toEqual(2); - // toHaveProperty is not working here due to dot in the property name - expect(result[0]).toEqual(expect.objectContaining({ - "enrollment.course": "Mathematics", - "student.name": "John" - })); -}); - -test('Execute SQL Query with LEFT JOIN', async () => { - const query = 'SELECT student.name, enrollment.course FROM student LEFT JOIN enrollment ON student.id=enrollment.student_id'; - const result = await executeSELECTQuery(query); - expect(result).toEqual(expect.arrayContaining([ - expect.objectContaining({ "student.name": "Alice", "enrollment.course": null }), - expect.objectContaining({ "student.name": "John", "enrollment.course": "Mathematics" }) - ])); - expect(result.length).toEqual(5); // 4 students, but John appears twice -}); - -test('Execute SQL Query with RIGHT JOIN', async () => { - const query = 'SELECT student.name, enrollment.course FROM student RIGHT JOIN enrollment ON student.id=enrollment.student_id'; - const result = await executeSELECTQuery(query); - expect(result).toEqual(expect.arrayContaining([ - expect.objectContaining({ "student.name": null, "enrollment.course": "Biology" }), - expect.objectContaining({ "student.name": "John", "enrollment.course": "Mathematics" }) - ])); - expect(result.length).toEqual(5); // 4 courses, but Mathematics appears twice -}); - -test('Execute SQL Query with LEFT JOIN with a WHERE clause filtering the main table', async () => { - const query = 'SELECT student.name, enrollment.course FROM student LEFT JOIN enrollment ON student.id=enrollment.student_id WHERE student.age > 22'; - const result = await executeSELECTQuery(query); - expect(result).toEqual(expect.arrayContaining([ - expect.objectContaining({ "enrollment.course": "Mathematics", "student.name": "John" }), - expect.objectContaining({ "enrollment.course": "Physics", "student.name": "John" }) - ])); - expect(result.length).toEqual(4); -}); - -test('Execute SQL Query with LEFT JOIN with a WHERE clause filtering the join table', async () => { - const query = `SELECT student.name, enrollment.course FROM student LEFT JOIN enrollment ON student.id=enrollment.student_id WHERE enrollment.course = 'Physics'`; - const result = await executeSELECTQuery(query); - expect(result).toEqual(expect.arrayContaining([ - expect.objectContaining({ "student.name": "John", "enrollment.course": "Physics" }) - ])); - expect(result.length).toEqual(1); -}); - -test('Execute SQL Query with RIGHT JOIN with a WHERE clause filtering the main table', async () => { - const query = 'SELECT student.name, enrollment.course FROM student RIGHT JOIN enrollment ON student.id=enrollment.student_id WHERE student.age < 25'; - const result = await executeSELECTQuery(query); - expect(result).toEqual(expect.arrayContaining([ - expect.objectContaining({ "enrollment.course": "Mathematics", "student.name": "Bob" }), - expect.objectContaining({ "enrollment.course": "Biology", "student.name": null }) - ])); - expect(result.length).toEqual(2); -}); - -test('Execute SQL Query with RIGHT JOIN with a WHERE clause filtering the join table', async () => { - const query = `SELECT student.name, enrollment.course FROM student RIGHT JOIN enrollment ON student.id=enrollment.student_id WHERE enrollment.course = 'Chemistry'`; - const result = await executeSELECTQuery(query); - expect(result).toEqual(expect.arrayContaining([ - expect.objectContaining({ "enrollment.course": "Chemistry", "student.name": "Jane" }), - ])); - expect(result.length).toEqual(1); -}); - -test('Execute SQL Query with RIGHT JOIN with a multiple WHERE clauses filtering the join table and main table', async () => { - const query = `SELECT student.name, enrollment.course FROM student RIGHT JOIN enrollment ON student.id=enrollment.student_id WHERE enrollment.course = 'Chemistry' AND student.age = 26`; - const result = await executeSELECTQuery(query); - expect(result).toEqual([]); -}); - -test('Execute COUNT Aggregate Query', async () => { - const query = 'SELECT COUNT(*) FROM student'; - const result = await executeSELECTQuery(query); - expect(result).toEqual([{ 'COUNT(*)': 4 }]); -}); - -test('Execute SUM Aggregate Query', async () => { - const query = 'SELECT SUM(age) FROM student'; - const result = await executeSELECTQuery(query); - expect(result).toEqual([{ 'SUM(age)': 101 }]); -}); - -test('Execute AVG Aggregate Query', async () => { - const query = 'SELECT AVG(age) FROM student'; - const result = await executeSELECTQuery(query); - // Assuming AVG returns a single decimal point value - expect(result).toEqual([{ 'AVG(age)': 25.25 }]); -}); - -test('Execute MIN Aggregate Query', async () => { - const query = 'SELECT MIN(age) FROM student'; - const result = await executeSELECTQuery(query); - expect(result).toEqual([{ 'MIN(age)': 22 }]); -}); - -test('Execute MAX Aggregate Query', async () => { - const query = 'SELECT MAX(age) FROM student'; - const result = await executeSELECTQuery(query); - expect(result).toEqual([{ 'MAX(age)': 30 }]); -}); - -test('Count students per age', async () => { - const query = 'SELECT age, COUNT(*) FROM student GROUP BY age'; - const result = await executeSELECTQuery(query); - expect(result).toEqual([ - { age: '22', 'COUNT(*)': 1 }, - { age: '24', 'COUNT(*)': 1 }, - { age: '25', 'COUNT(*)': 1 }, - { age: '30', 'COUNT(*)': 1 } - ]); -}); - -test('Count enrollments per course', async () => { - const query = 'SELECT course, COUNT(*) FROM enrollment GROUP BY course'; - const result = await executeSELECTQuery(query); - expect(result).toEqual([ - { course: 'Mathematics', 'COUNT(*)': 2 }, - { course: 'Physics', 'COUNT(*)': 1 }, - { course: 'Chemistry', 'COUNT(*)': 1 }, - { course: 'Biology', 'COUNT(*)': 1 } - ]); -}); - - -test('Count courses per student', async () => { - const query = 'SELECT student_id, COUNT(*) FROM enrollment GROUP BY student_id'; - const result = await executeSELECTQuery(query); - expect(result).toEqual([ - { student_id: '1', 'COUNT(*)': 2 }, - { student_id: '2', 'COUNT(*)': 1 }, - { student_id: '3', 'COUNT(*)': 1 }, - { student_id: '5', 'COUNT(*)': 1 } - ]); -}); - -test('Count students within a specific age range', async () => { - const query = 'SELECT age, COUNT(*) FROM student WHERE age > 22 GROUP BY age'; - const result = await executeSELECTQuery(query); - expect(result).toEqual([ - { age: '24', 'COUNT(*)': 1 }, - { age: '25', 'COUNT(*)': 1 }, - { age: '30', 'COUNT(*)': 1 } - ]); -}); - -test('Count enrollments for a specific course', async () => { - const query = 'SELECT course, COUNT(*) FROM enrollment WHERE course = "Mathematics" GROUP BY course'; - const result = await executeSELECTQuery(query); - expect(result).toEqual([ - { course: 'Mathematics', 'COUNT(*)': 2 } - ]); -}); - -test('Count courses for a specific student', async () => { - const query = 'SELECT student_id, COUNT(*) FROM enrollment WHERE student_id = 1 GROUP BY student_id'; - const result = await executeSELECTQuery(query); - expect(result).toEqual([ - { student_id: '1', 'COUNT(*)': 2 } - ]); -}); - -test('Average age of students above a certain age', async () => { - const query = 'SELECT AVG(age) FROM student WHERE age > 22'; - const result = await executeSELECTQuery(query); - const expectedAverage = (25 + 30 + 24) / 3; // Average age of students older than 22 - expect(result).toEqual([{ 'AVG(age)': expectedAverage }]); -}); - -test('Parse SQL Query', () => { - const query = 'SELECT id, name FROM student'; - const parsed = parseQuery(query); - expect(parsed).toEqual({ - fields: ['id', 'name'], - table: 'student', - whereClauses: [], - joinCondition: null, - joinTable: null, - joinType: null, - groupByFields: null, - hasAggregateWithoutGroupBy: false, - "orderByFields": null - }); -}); - -test('Parse SQL Query with WHERE Clause', () => { - const query = 'SELECT id, name FROM student WHERE age = 25'; - const parsed = parseQuery(query); - expect(parsed).toEqual({ - fields: ['id', 'name'], - table: 'student', - whereClauses: [{ - "field": "age", - "operator": "=", - "value": "25", - }], - joinCondition: null, - joinTable: null, - joinType: null, - groupByFields: null, - hasAggregateWithoutGroupBy: false, - "orderByFields": null - }); -}); - -test('Parse SQL Query with Multiple WHERE Clauses', () => { - const query = 'SELECT id, name FROM student WHERE age = 30 AND name = John'; - const parsed = parseQuery(query); - expect(parsed).toEqual({ - fields: ['id', 'name'], - table: 'student', - whereClauses: [{ - "field": "age", - "operator": "=", - "value": "30", - }, { - "field": "name", - "operator": "=", - "value": "John", - }], - joinCondition: null, - joinTable: null, - joinType: null, - groupByFields: null, - hasAggregateWithoutGroupBy: false, - "orderByFields": null - }); -}); - -test('Parse SQL Query with INNER JOIN', async () => { - const query = 'SELECT student.name, enrollment.course FROM student INNER JOIN enrollment ON student.id=enrollment.student_id'; - const result = await parseQuery(query); - expect(result).toEqual({ - fields: ['student.name', 'enrollment.course'], - table: 'student', - whereClauses: [], - joinTable: 'enrollment', - joinType: "INNER", - joinCondition: { left: 'student.id', right: 'enrollment.student_id' }, - groupByFields: null, - hasAggregateWithoutGroupBy: false, - "orderByFields": null - }) -}); - -test('Parse SQL Query with INNER JOIN and WHERE Clause', async () => { - const query = 'SELECT student.name, enrollment.course FROM student INNER JOIN enrollment ON student.id = enrollment.student_id WHERE student.age > 20'; - const result = await parseQuery(query); - expect(result).toEqual({ - fields: ['student.name', 'enrollment.course'], - table: 'student', - whereClauses: [{ field: 'student.age', operator: '>', value: '20' }], - joinTable: 'enrollment', - joinType: "INNER", - joinCondition: { left: 'student.id', right: 'enrollment.student_id' }, - groupByFields: null, - hasAggregateWithoutGroupBy: false, - "orderByFields": null + expect(result.length).toEqual(2); + // toHaveProperty is not working here due to dot in the property name + expect(result[0]).toEqual( + expect.objectContaining({ + "enrollment.course": "Mathematics", + "student.name": "John", }) + ); +}); + +test("Execute SQL Query with LEFT JOIN", async () => { + const query = + "SELECT student.name, enrollment.course FROM student LEFT JOIN enrollment ON student.id=enrollment.student_id"; + const result = await executeSELECTQuery(query); + expect(result).toEqual( + expect.arrayContaining([ + expect.objectContaining({ + "student.name": "Alice", + "enrollment.course": null, + }), + expect.objectContaining({ + "student.name": "John", + "enrollment.course": "Mathematics", + }), + ]) + ); + expect(result.length).toEqual(5); // 4 students, but John appears twice +}); + +test("Execute SQL Query with RIGHT JOIN", async () => { + const query = + "SELECT student.name, enrollment.course FROM student RIGHT JOIN enrollment ON student.id=enrollment.student_id"; + const result = await executeSELECTQuery(query); + expect(result).toEqual( + expect.arrayContaining([ + expect.objectContaining({ + "student.name": null, + "enrollment.course": "Biology", + }), + expect.objectContaining({ + "student.name": "John", + "enrollment.course": "Mathematics", + }), + ]) + ); + expect(result.length).toEqual(5); // 4 courses, but Mathematics appears twice +}); + +test("Execute SQL Query with LEFT JOIN with a WHERE clause filtering the main table", async () => { + const query = + "SELECT student.name, enrollment.course FROM student LEFT JOIN enrollment ON student.id=enrollment.student_id WHERE student.age > 22"; + const result = await executeSELECTQuery(query); + expect(result).toEqual( + expect.arrayContaining([ + expect.objectContaining({ + "enrollment.course": "Mathematics", + "student.name": "John", + }), + expect.objectContaining({ + "enrollment.course": "Physics", + "student.name": "John", + }), + ]) + ); + expect(result.length).toEqual(4); +}); + +test("Execute SQL Query with LEFT JOIN with a WHERE clause filtering the join table", async () => { + const query = `SELECT student.name, enrollment.course FROM student LEFT JOIN enrollment ON student.id=enrollment.student_id WHERE enrollment.course = 'Physics'`; + const result = await executeSELECTQuery(query); + expect(result).toEqual( + expect.arrayContaining([ + expect.objectContaining({ + "student.name": "John", + "enrollment.course": "Physics", + }), + ]) + ); + expect(result.length).toEqual(1); +}); + +test("Execute SQL Query with RIGHT JOIN with a WHERE clause filtering the main table", async () => { + const query = + "SELECT student.name, enrollment.course FROM student RIGHT JOIN enrollment ON student.id=enrollment.student_id WHERE student.age < 25"; + const result = await executeSELECTQuery(query); + expect(result).toEqual( + expect.arrayContaining([ + expect.objectContaining({ + "enrollment.course": "Mathematics", + "student.name": "Bob", + }), + expect.objectContaining({ + "enrollment.course": "Biology", + "student.name": null, + }), + ]) + ); + expect(result.length).toEqual(2); +}); + +test("Execute SQL Query with RIGHT JOIN with a WHERE clause filtering the join table", async () => { + const query = `SELECT student.name, enrollment.course FROM student RIGHT JOIN enrollment ON student.id=enrollment.student_id WHERE enrollment.course = 'Chemistry'`; + const result = await executeSELECTQuery(query); + expect(result).toEqual( + expect.arrayContaining([ + expect.objectContaining({ + "enrollment.course": "Chemistry", + "student.name": "Jane", + }), + ]) + ); + expect(result.length).toEqual(1); +}); + +test("Execute SQL Query with RIGHT JOIN with a multiple WHERE clauses filtering the join table and main table", async () => { + const query = `SELECT student.name, enrollment.course FROM student RIGHT JOIN enrollment ON student.id=enrollment.student_id WHERE enrollment.course = 'Chemistry' AND student.age = 26`; + const result = await executeSELECTQuery(query); + expect(result).toEqual([]); +}); + +test("Execute COUNT Aggregate Query", async () => { + const query = "SELECT COUNT(*) FROM student"; + const result = await executeSELECTQuery(query); + expect(result).toEqual([{ "COUNT(*)": 4 }]); +}); + +test("Execute SUM Aggregate Query", async () => { + const query = "SELECT SUM(age) FROM student"; + const result = await executeSELECTQuery(query); + expect(result).toEqual([{ "SUM(age)": 101 }]); +}); + +test("Execute AVG Aggregate Query", async () => { + const query = "SELECT AVG(age) FROM student"; + const result = await executeSELECTQuery(query); + // Assuming AVG returns a single decimal point value + expect(result).toEqual([{ "AVG(age)": 25.25 }]); +}); + +test("Execute MIN Aggregate Query", async () => { + const query = "SELECT MIN(age) FROM student"; + const result = await executeSELECTQuery(query); + expect(result).toEqual([{ "MIN(age)": 22 }]); +}); + +test("Execute MAX Aggregate Query", async () => { + const query = "SELECT MAX(age) FROM student"; + const result = await executeSELECTQuery(query); + expect(result).toEqual([{ "MAX(age)": 30 }]); +}); + +test("Count students per age", async () => { + const query = "SELECT age, COUNT(*) FROM student GROUP BY age"; + const result = await executeSELECTQuery(query); + expect(result).toEqual([ + { age: "22", "COUNT(*)": 1 }, + { age: "24", "COUNT(*)": 1 }, + { age: "25", "COUNT(*)": 1 }, + { age: "30", "COUNT(*)": 1 }, + ]); +}); + +test("Count enrollments per course", async () => { + const query = "SELECT course, COUNT(*) FROM enrollment GROUP BY course"; + const result = await executeSELECTQuery(query); + expect(result).toEqual([ + { course: "Mathematics", "COUNT(*)": 2 }, + { course: "Physics", "COUNT(*)": 1 }, + { course: "Chemistry", "COUNT(*)": 1 }, + { course: "Biology", "COUNT(*)": 1 }, + ]); +}); + +test("Count courses per student", async () => { + const query = + "SELECT student_id, COUNT(*) FROM enrollment GROUP BY student_id"; + const result = await executeSELECTQuery(query); + expect(result).toEqual([ + { student_id: "1", "COUNT(*)": 2 }, + { student_id: "2", "COUNT(*)": 1 }, + { student_id: "3", "COUNT(*)": 1 }, + { student_id: "5", "COUNT(*)": 1 }, + ]); +}); + +test("Count students within a specific age range", async () => { + const query = "SELECT age, COUNT(*) FROM student WHERE age > 22 GROUP BY age"; + const result = await executeSELECTQuery(query); + expect(result).toEqual([ + { age: "24", "COUNT(*)": 1 }, + { age: "25", "COUNT(*)": 1 }, + { age: "30", "COUNT(*)": 1 }, + ]); +}); + +test("Count enrollments for a specific course", async () => { + const query = + 'SELECT course, COUNT(*) FROM enrollment WHERE course = "Mathematics" GROUP BY course'; + const result = await executeSELECTQuery(query); + expect(result).toEqual([{ course: "Mathematics", "COUNT(*)": 2 }]); +}); + +test("Count courses for a specific student", async () => { + const query = + "SELECT student_id, COUNT(*) FROM enrollment WHERE student_id = 1 GROUP BY student_id"; + const result = await executeSELECTQuery(query); + expect(result).toEqual([{ student_id: "1", "COUNT(*)": 2 }]); +}); + +test("Average age of students above a certain age", async () => { + const query = "SELECT AVG(age) FROM student WHERE age > 22"; + const result = await executeSELECTQuery(query); + const expectedAverage = (25 + 30 + 24) / 3; // Average age of students older than 22 + expect(result).toEqual([{ "AVG(age)": expectedAverage }]); +}); + +test("Parse SQL Query", () => { + const query = "SELECT id, name FROM student"; + const parsed = parseSelectQuery(query); + expect(parsed).toEqual({ + fields: ["id", "name"], + table: "student", + whereClauses: [], + joinCondition: null, + joinTable: null, + joinType: null, + groupByFields: null, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse SQL Query with WHERE Clause", () => { + const query = "SELECT id, name FROM student WHERE age = 25"; + const parsed = parseSelectQuery(query); + expect(parsed).toEqual({ + fields: ["id", "name"], + table: "student", + whereClauses: [ + { + field: "age", + operator: "=", + value: "25", + }, + ], + joinCondition: null, + joinTable: null, + joinType: null, + groupByFields: null, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse SQL Query with Multiple WHERE Clauses", () => { + const query = "SELECT id, name FROM student WHERE age = 30 AND name = John"; + const parsed = parseSelectQuery(query); + expect(parsed).toEqual({ + fields: ["id", "name"], + table: "student", + whereClauses: [ + { + field: "age", + operator: "=", + value: "30", + }, + { + field: "name", + operator: "=", + value: "John", + }, + ], + joinCondition: null, + joinTable: null, + joinType: null, + groupByFields: null, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse SQL Query with INNER JOIN", async () => { + const query = + "SELECT student.name, enrollment.course FROM student INNER JOIN enrollment ON student.id=enrollment.student_id"; + const result = await parseSelectQuery(query); + expect(result).toEqual({ + fields: ["student.name", "enrollment.course"], + table: "student", + whereClauses: [], + joinTable: "enrollment", + joinType: "INNER", + joinCondition: { left: "student.id", right: "enrollment.student_id" }, + groupByFields: null, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse SQL Query with INNER JOIN and WHERE Clause", async () => { + const query = + "SELECT student.name, enrollment.course FROM student INNER JOIN enrollment ON student.id = enrollment.student_id WHERE student.age > 20"; + const result = await parseSelectQuery(query); + expect(result).toEqual({ + fields: ["student.name", "enrollment.course"], + table: "student", + whereClauses: [{ field: "student.age", operator: ">", value: "20" }], + joinTable: "enrollment", + joinType: "INNER", + joinCondition: { left: "student.id", right: "enrollment.student_id" }, + groupByFields: null, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse INNER JOIN clause", () => { + const query = + "SELECT * FROM table1 INNER JOIN table2 ON table1.id = table2.ref_id"; + const result = parseJoinClause(query); + expect(result).toEqual({ + joinType: "INNER", + joinTable: "table2", + joinCondition: { left: "table1.id", right: "table2.ref_id" }, + }); +}); + +test("Parse LEFT JOIN clause", () => { + const query = + "SELECT * FROM table1 LEFT JOIN table2 ON table1.id = table2.ref_id"; + const result = parseJoinClause(query); + expect(result).toEqual({ + joinType: "LEFT", + joinTable: "table2", + joinCondition: { left: "table1.id", right: "table2.ref_id" }, + }); +}); + +test("Parse RIGHT JOIN clause", () => { + const query = + "SELECT * FROM table1 RIGHT JOIN table2 ON table1.id = table2.ref_id"; + const result = parseJoinClause(query); + expect(result).toEqual({ + joinType: "RIGHT", + joinTable: "table2", + joinCondition: { left: "table1.id", right: "table2.ref_id" }, + }); +}); + +test("Returns null for queries without JOIN", () => { + const query = "SELECT * FROM table1"; + const result = parseJoinClause(query); + expect(result).toEqual({ + joinType: null, + joinTable: null, + joinCondition: null, + }); +}); + +test("Parse LEFT Join Query Completely", () => { + const query = + "SELECT student.name, enrollment.course FROM student LEFT JOIN enrollment ON student.id=enrollment.student_id"; + const result = parseSelectQuery(query); + expect(result).toEqual({ + fields: ["student.name", "enrollment.course"], + table: "student", + whereClauses: [], + joinType: "LEFT", + joinTable: "enrollment", + joinCondition: { left: "student.id", right: "enrollment.student_id" }, + groupByFields: null, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse LEFT Join Query Completely", () => { + const query = + "SELECT student.name, enrollment.course FROM student RIGHT JOIN enrollment ON student.id=enrollment.student_id"; + const result = parseSelectQuery(query); + expect(result).toEqual({ + fields: ["student.name", "enrollment.course"], + table: "student", + whereClauses: [], + joinType: "RIGHT", + joinTable: "enrollment", + joinCondition: { left: "student.id", right: "enrollment.student_id" }, + groupByFields: null, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse SQL Query with LEFT JOIN with a WHERE clause filtering the main table", async () => { + const query = + "SELECT student.name, enrollment.course FROM student LEFT JOIN enrollment ON student.id=enrollment.student_id WHERE student.age > 22"; + const result = await parseSelectQuery(query); + expect(result).toEqual({ + fields: ["student.name", "enrollment.course"], + joinCondition: { left: "student.id", right: "enrollment.student_id" }, + joinTable: "enrollment", + joinType: "LEFT", + table: "student", + whereClauses: [{ field: "student.age", operator: ">", value: "22" }], + groupByFields: null, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse SQL Query with LEFT JOIN with a WHERE clause filtering the join table", async () => { + const query = `SELECT student.name, enrollment.course FROM student LEFT JOIN enrollment ON student.id=enrollment.student_id WHERE enrollment.course = 'Physics'`; + const result = await parseSelectQuery(query); + expect(result).toEqual({ + fields: ["student.name", "enrollment.course"], + joinCondition: { left: "student.id", right: "enrollment.student_id" }, + joinTable: "enrollment", + joinType: "LEFT", + table: "student", + whereClauses: [ + { field: "enrollment.course", operator: "=", value: "'Physics'" }, + ], + groupByFields: null, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse SQL Query with RIGHT JOIN with a WHERE clause filtering the main table", async () => { + const query = + "SELECT student.name, enrollment.course FROM student RIGHT JOIN enrollment ON student.id=enrollment.student_id WHERE student.age < 25"; + const result = await parseSelectQuery(query); + expect(result).toEqual({ + fields: ["student.name", "enrollment.course"], + joinCondition: { left: "student.id", right: "enrollment.student_id" }, + joinTable: "enrollment", + joinType: "RIGHT", + table: "student", + whereClauses: [{ field: "student.age", operator: "<", value: "25" }], + groupByFields: null, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse SQL Query with RIGHT JOIN with a WHERE clause filtering the join table", async () => { + const query = `SELECT student.name, enrollment.course FROM student RIGHT JOIN enrollment ON student.id=enrollment.student_id WHERE enrollment.course = 'Chemistry'`; + const result = await parseSelectQuery(query); + expect(result).toEqual({ + fields: ["student.name", "enrollment.course"], + joinCondition: { left: "student.id", right: "enrollment.student_id" }, + joinTable: "enrollment", + joinType: "RIGHT", + table: "student", + whereClauses: [ + { field: "enrollment.course", operator: "=", value: "'Chemistry'" }, + ], + groupByFields: null, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse COUNT Aggregate Query", () => { + const query = "SELECT COUNT(*) FROM student"; + const parsed = parseSelectQuery(query); + expect(parsed).toEqual({ + fields: ["COUNT(*)"], + table: "student", + whereClauses: [], + groupByFields: null, + hasAggregateWithoutGroupBy: true, + joinCondition: null, + joinTable: null, + joinType: null, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse SUM Aggregate Query", () => { + const query = "SELECT SUM(age) FROM student"; + const parsed = parseSelectQuery(query); + expect(parsed).toEqual({ + fields: ["SUM(age)"], + table: "student", + whereClauses: [], + groupByFields: null, + hasAggregateWithoutGroupBy: true, + joinCondition: null, + joinTable: null, + joinType: null, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse AVG Aggregate Query", () => { + const query = "SELECT AVG(age) FROM student"; + const parsed = parseSelectQuery(query); + expect(parsed).toEqual({ + fields: ["AVG(age)"], + table: "student", + whereClauses: [], + groupByFields: null, + hasAggregateWithoutGroupBy: true, + joinCondition: null, + joinTable: null, + joinType: null, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse MIN Aggregate Query", () => { + const query = "SELECT MIN(age) FROM student"; + const parsed = parseSelectQuery(query); + expect(parsed).toEqual({ + fields: ["MIN(age)"], + table: "student", + whereClauses: [], + groupByFields: null, + hasAggregateWithoutGroupBy: true, + joinCondition: null, + joinTable: null, + joinType: null, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse MAX Aggregate Query", () => { + const query = "SELECT MAX(age) FROM student"; + const parsed = parseSelectQuery(query); + expect(parsed).toEqual({ + fields: ["MAX(age)"], + table: "student", + whereClauses: [], + groupByFields: null, + hasAggregateWithoutGroupBy: true, + joinCondition: null, + joinTable: null, + joinType: null, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse basic GROUP BY query", () => { + const query = "SELECT age, COUNT(*) FROM student GROUP BY age"; + const parsed = parseSelectQuery(query); + expect(parsed).toEqual({ + fields: ["age", "COUNT(*)"], + table: "student", + whereClauses: [], + groupByFields: ["age"], + joinType: null, + joinTable: null, + joinCondition: null, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse GROUP BY query with WHERE clause", () => { + const query = "SELECT age, COUNT(*) FROM student WHERE age > 22 GROUP BY age"; + const parsed = parseSelectQuery(query); + expect(parsed).toEqual({ + fields: ["age", "COUNT(*)"], + table: "student", + whereClauses: [{ field: "age", operator: ">", value: "22" }], + groupByFields: ["age"], + joinType: null, + joinTable: null, + joinCondition: null, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse GROUP BY query with multiple fields", () => { + const query = + "SELECT student_id, course, COUNT(*) FROM enrollment GROUP BY student_id, course"; + const parsed = parseSelectQuery(query); + expect(parsed).toEqual({ + fields: ["student_id", "course", "COUNT(*)"], + table: "enrollment", + whereClauses: [], + groupByFields: ["student_id", "course"], + joinType: null, + joinTable: null, + joinCondition: null, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse GROUP BY query with JOIN and WHERE clauses", () => { + const query = + 'SELECT student.name, COUNT(*) FROM student INNER JOIN enrollment ON student.id = enrollment.student_id WHERE enrollment.course = "Mathematics" GROUP BY student.name'; + const parsed = parseSelectQuery(query); + expect(parsed).toEqual({ + fields: ["student.name", "COUNT(*)"], + table: "student", + whereClauses: [ + { field: "enrollment.course", operator: "=", value: '"Mathematics"' }, + ], + groupByFields: ["student.name"], + joinType: "INNER", + joinTable: "enrollment", + joinCondition: { + left: "student.id", + right: "enrollment.student_id", + }, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Execute SQL Query with ORDER BY", async () => { + const query = "SELECT name FROM student ORDER BY name ASC"; + const result = await executeSELECTQuery(query); + + expect(result).toStrictEqual([ + { name: "Alice" }, + { name: "Bob" }, + { name: "Jane" }, + { name: "John" }, + ]); +}); + +test("Execute SQL Query with ORDER BY and WHERE", async () => { + const query = "SELECT name FROM student WHERE age > 24 ORDER BY name DESC"; + const result = await executeSELECTQuery(query); + + expect(result).toStrictEqual([{ name: "John" }, { name: "Jane" }]); +}); +test("Execute SQL Query with ORDER BY and GROUP BY", async () => { + const query = + "SELECT COUNT(id) as count, age FROM student GROUP BY age ORDER BY age DESC"; + const result = await executeSELECTQuery(query); + + expect(result).toStrictEqual([ + { age: "30", "COUNT(id) as count": 1 }, + { age: "25", "COUNT(id) as count": 1 }, + { age: "24", "COUNT(id) as count": 1 }, + { age: "22", "COUNT(id) as count": 1 }, + ]); }); - -test('Parse INNER JOIN clause', () => { - const query = 'SELECT * FROM table1 INNER JOIN table2 ON table1.id = table2.ref_id'; - const result = parseJoinClause(query); - expect(result).toEqual({ - joinType: 'INNER', - joinTable: 'table2', - joinCondition: { left: 'table1.id', right: 'table2.ref_id' }, - }); -}); - -test('Parse LEFT JOIN clause', () => { - const query = 'SELECT * FROM table1 LEFT JOIN table2 ON table1.id = table2.ref_id'; - const result = parseJoinClause(query); - expect(result).toEqual({ - joinType: 'LEFT', - joinTable: 'table2', - joinCondition: { left: 'table1.id', right: 'table2.ref_id' } - }); -}); - -test('Parse RIGHT JOIN clause', () => { - const query = 'SELECT * FROM table1 RIGHT JOIN table2 ON table1.id = table2.ref_id'; - const result = parseJoinClause(query); - expect(result).toEqual({ - joinType: 'RIGHT', - joinTable: 'table2', - joinCondition: { left: 'table1.id', right: 'table2.ref_id' } - }); -}); - -test('Returns null for queries without JOIN', () => { - const query = 'SELECT * FROM table1'; - const result = parseJoinClause(query); - expect(result).toEqual( - { - joinType: null, - joinTable: null, - joinCondition: null - } - ); -}); - -test('Parse LEFT Join Query Completely', () => { - const query = 'SELECT student.name, enrollment.course FROM student LEFT JOIN enrollment ON student.id=enrollment.student_id'; - const result = parseQuery(query); - expect(result).toEqual({ - fields: ['student.name', 'enrollment.course'], - table: 'student', - whereClauses: [], - joinType: 'LEFT', - joinTable: 'enrollment', - joinCondition: { left: 'student.id', right: 'enrollment.student_id' }, - groupByFields: null, - hasAggregateWithoutGroupBy: false, - "orderByFields": null - }) -}) - -test('Parse LEFT Join Query Completely', () => { - const query = 'SELECT student.name, enrollment.course FROM student RIGHT JOIN enrollment ON student.id=enrollment.student_id'; - const result = parseQuery(query); - expect(result).toEqual({ - fields: ['student.name', 'enrollment.course'], - table: 'student', - whereClauses: [], - joinType: 'RIGHT', - joinTable: 'enrollment', - joinCondition: { left: 'student.id', right: 'enrollment.student_id' }, - groupByFields: null, - hasAggregateWithoutGroupBy: false, - "orderByFields": null - }) -}) - -test('Parse SQL Query with LEFT JOIN with a WHERE clause filtering the main table', async () => { - const query = 'SELECT student.name, enrollment.course FROM student LEFT JOIN enrollment ON student.id=enrollment.student_id WHERE student.age > 22'; - const result = await parseQuery(query); - expect(result).toEqual({ - "fields": ["student.name", "enrollment.course"], - "joinCondition": { "left": "student.id", "right": "enrollment.student_id" }, - "joinTable": "enrollment", - "joinType": "LEFT", - "table": "student", - "whereClauses": [{ "field": "student.age", "operator": ">", "value": "22" }], - groupByFields: null, - hasAggregateWithoutGroupBy: false, - "orderByFields": null - }); -}); - -test('Parse SQL Query with LEFT JOIN with a WHERE clause filtering the join table', async () => { - const query = `SELECT student.name, enrollment.course FROM student LEFT JOIN enrollment ON student.id=enrollment.student_id WHERE enrollment.course = 'Physics'`; - const result = await parseQuery(query); - expect(result).toEqual({ - "fields": ["student.name", "enrollment.course"], - "joinCondition": { "left": "student.id", "right": "enrollment.student_id" }, - "joinTable": "enrollment", - "joinType": "LEFT", - "table": "student", - "whereClauses": [{ "field": "enrollment.course", "operator": "=", "value": "'Physics'" }], - groupByFields: null, - hasAggregateWithoutGroupBy: false, - "orderByFields": null - }); -}); - -test('Parse SQL Query with RIGHT JOIN with a WHERE clause filtering the main table', async () => { - const query = 'SELECT student.name, enrollment.course FROM student RIGHT JOIN enrollment ON student.id=enrollment.student_id WHERE student.age < 25'; - const result = await parseQuery(query); - expect(result).toEqual({ - "fields": ["student.name", "enrollment.course"], - "joinCondition": { "left": "student.id", "right": "enrollment.student_id" }, - "joinTable": "enrollment", - "joinType": "RIGHT", - "table": "student", - "whereClauses": [{ "field": "student.age", "operator": "<", "value": "25" }], - groupByFields: null, - hasAggregateWithoutGroupBy: false, - "orderByFields": null - }); -}); - -test('Parse SQL Query with RIGHT JOIN with a WHERE clause filtering the join table', async () => { - const query = `SELECT student.name, enrollment.course FROM student RIGHT JOIN enrollment ON student.id=enrollment.student_id WHERE enrollment.course = 'Chemistry'`; - const result = await parseQuery(query); - expect(result).toEqual({ - "fields": ["student.name", "enrollment.course"], - "joinCondition": { "left": "student.id", "right": "enrollment.student_id" }, - "joinTable": "enrollment", - "joinType": "RIGHT", - "table": "student", - "whereClauses": [{ "field": "enrollment.course", "operator": "=", "value": "'Chemistry'" }], - groupByFields: null, - hasAggregateWithoutGroupBy: false, - "orderByFields": null - }); -}); - - -test('Parse COUNT Aggregate Query', () => { - const query = 'SELECT COUNT(*) FROM student'; - const parsed = parseQuery(query); - expect(parsed).toEqual({ - fields: ['COUNT(*)'], - table: 'student', - whereClauses: [], - groupByFields: null, - hasAggregateWithoutGroupBy: true, - "joinCondition": null, - "joinTable": null, - "joinType": null, - "orderByFields": null - }); -}); - - -test('Parse SUM Aggregate Query', () => { - const query = 'SELECT SUM(age) FROM student'; - const parsed = parseQuery(query); - expect(parsed).toEqual({ - fields: ['SUM(age)'], - table: 'student', - whereClauses: [], - groupByFields: null, - hasAggregateWithoutGroupBy: true, - "joinCondition": null, - "joinTable": null, - "joinType": null, - "orderByFields": null - }); -}); - -test('Parse AVG Aggregate Query', () => { - const query = 'SELECT AVG(age) FROM student'; - const parsed = parseQuery(query); - expect(parsed).toEqual({ - fields: ['AVG(age)'], - table: 'student', - whereClauses: [], - groupByFields: null, - hasAggregateWithoutGroupBy: true, - "joinCondition": null, - "joinTable": null, - "joinType": null, - "orderByFields": null - }); -}); - -test('Parse MIN Aggregate Query', () => { - const query = 'SELECT MIN(age) FROM student'; - const parsed = parseQuery(query); - expect(parsed).toEqual({ - fields: ['MIN(age)'], - table: 'student', - whereClauses: [], - groupByFields: null, - hasAggregateWithoutGroupBy: true, - "joinCondition": null, - "joinTable": null, - "joinType": null, - "orderByFields": null - }); -}); - -test('Parse MAX Aggregate Query', () => { - const query = 'SELECT MAX(age) FROM student'; - const parsed = parseQuery(query); - expect(parsed).toEqual({ - fields: ['MAX(age)'], - table: 'student', - whereClauses: [], - groupByFields: null, - hasAggregateWithoutGroupBy: true, - "joinCondition": null, - "joinTable": null, - "joinType": null, - "orderByFields": null - }); -}); - -test('Parse basic GROUP BY query', () => { - const query = 'SELECT age, COUNT(*) FROM student GROUP BY age'; - const parsed = parseQuery(query); - expect(parsed).toEqual({ - fields: ['age', 'COUNT(*)'], - table: 'student', - whereClauses: [], - groupByFields: ['age'], - joinType: null, - joinTable: null, - joinCondition: null, - hasAggregateWithoutGroupBy: false, - orderByFields: null - }); -}); - -test('Parse GROUP BY query with WHERE clause', () => { - const query = 'SELECT age, COUNT(*) FROM student WHERE age > 22 GROUP BY age'; - const parsed = parseQuery(query); - expect(parsed).toEqual({ - fields: ['age', 'COUNT(*)'], - table: 'student', - whereClauses: [{ field: 'age', operator: '>', value: '22' }], - groupByFields: ['age'], - joinType: null, - joinTable: null, - joinCondition: null, - hasAggregateWithoutGroupBy: false, - orderByFields: null - }); -}); - -test('Parse GROUP BY query with multiple fields', () => { - const query = 'SELECT student_id, course, COUNT(*) FROM enrollment GROUP BY student_id, course'; - const parsed = parseQuery(query); - expect(parsed).toEqual({ - fields: ['student_id', 'course', 'COUNT(*)'], - table: 'enrollment', - whereClauses: [], - groupByFields: ['student_id', 'course'], - joinType: null, - joinTable: null, - joinCondition: null, - hasAggregateWithoutGroupBy: false, - orderByFields: null - }); -}); - -test('Parse GROUP BY query with JOIN and WHERE clauses', () => { - const query = 'SELECT student.name, COUNT(*) FROM student INNER JOIN enrollment ON student.id = enrollment.student_id WHERE enrollment.course = "Mathematics" GROUP BY student.name'; - const parsed = parseQuery(query); - expect(parsed).toEqual({ - fields: ['student.name', 'COUNT(*)'], - table: 'student', - whereClauses: [{ field: 'enrollment.course', operator: '=', value: '"Mathematics"' }], - groupByFields: ['student.name'], - joinType: 'INNER', - joinTable: 'enrollment', - joinCondition: { - left: 'student.id', - right: 'enrollment.student_id' - }, - hasAggregateWithoutGroupBy: false, - orderByFields: null - }); -}); - -test('Execute SQL Query with ORDER BY', async () => { - const query = 'SELECT name FROM student ORDER BY name ASC'; - const result = await executeSELECTQuery(query); - - expect(result).toStrictEqual([ - { name: 'Alice' }, - { name: 'Bob' }, - { name: 'Jane' }, - { name: 'John' } - ]); -}); - -test('Execute SQL Query with ORDER BY and WHERE', async () => { - const query = 'SELECT name FROM student WHERE age > 24 ORDER BY name DESC'; - const result = await executeSELECTQuery(query); - - expect(result).toStrictEqual([ - { name: 'John' }, - { name: 'Jane' }, - ]); -}); -test('Execute SQL Query with ORDER BY and GROUP BY', async () => { - const query = 'SELECT COUNT(id) as count, age FROM student GROUP BY age ORDER BY age DESC'; - const result = await executeSELECTQuery(query); - - expect(result).toStrictEqual([ - { age: '30', 'COUNT(id) as count': 1 }, - { age: '25', 'COUNT(id) as count': 1 }, - { age: '24', 'COUNT(id) as count': 1 }, - { age: '22', 'COUNT(id) as count': 1 } - ]); -}); \ No newline at end of file diff --git a/tests/step-12/index.test.js b/tests/step-12/index.test.js index d15c77ef5..1778da41e 100644 --- a/tests/step-12/index.test.js +++ b/tests/step-12/index.test.js @@ -1,59 +1,60 @@ -const readCSV = require('../../src/csvReader'); -const {parseQuery, parseJoinClause} = require('../../src/queryParser'); -const executeSELECTQuery = require('../../src/index'); - -test('Read CSV File', async () => { - const data = await readCSV('./student.csv'); - expect(data.length).toBeGreaterThan(0); - expect(data.length).toBe(4); - expect(data[0].name).toBe('John'); - expect(data[0].age).toBe('30'); //ignore the string type here, we will fix this later -}); - -test('Execute SQL Query', async () => { - const query = 'SELECT id, name FROM student'; - const result = await executeSELECTQuery(query); - expect(result.length).toBeGreaterThan(0); - expect(result[0]).toHaveProperty('id'); - expect(result[0]).toHaveProperty('name'); - expect(result[0]).not.toHaveProperty('age'); - expect(result[0]).toEqual({ id: '1', name: 'John' }); -}); - -test('Execute SQL Query with WHERE Clause', async () => { - const query = 'SELECT id, name FROM student WHERE age = 25'; - const result = await executeSELECTQuery(query); - expect(result.length).toBe(1); - expect(result[0]).toHaveProperty('id'); - expect(result[0]).toHaveProperty('name'); - expect(result[0].id).toBe('2'); -}); - -test('Execute SQL Query with Complex WHERE Clause', async () => { - const query = 'SELECT id, name FROM student WHERE age = 30 AND name = John'; - const result = await executeSELECTQuery(query); - expect(result.length).toBe(1); - expect(result[0]).toEqual({ id: '1', name: 'John' }); -}); - -test('Execute SQL Query with Greater Than', async () => { - const queryWithGT = 'SELECT id FROM student WHERE age > 22'; - const result = await executeSELECTQuery(queryWithGT); - expect(result.length).toEqual(3); - expect(result[0]).toHaveProperty('id'); -}); - -test('Execute SQL Query with Not Equal to', async () => { - const queryWithGT = 'SELECT name FROM student WHERE age != 25'; - const result = await executeSELECTQuery(queryWithGT); - expect(result.length).toEqual(3); - expect(result[0]).toHaveProperty('name'); -}); - -test('Execute SQL Query with INNER JOIN', async () => { - const query = 'SELECT student.name, enrollment.course FROM student INNER JOIN enrollment ON student.id=enrollment.student_id'; - const result = await executeSELECTQuery(query); - /* +const { readCSV } = require("../../src/csvReader"); +const { parseSelectQuery, parseJoinClause } = require("../../src/queryParser"); +const { executeSELECTQuery } = require("../../src/queryExecutor"); + +test("Read CSV File", async () => { + const data = await readCSV("./student.csv"); + expect(data.length).toBeGreaterThan(0); + expect(data.length).toBe(4); + expect(data[0].name).toBe("John"); + expect(data[0].age).toBe("30"); //ignore the string type here, we will fix this later +}); + +test("Execute SQL Query", async () => { + const query = "SELECT id, name FROM student"; + const result = await executeSELECTQuery(query); + expect(result.length).toBeGreaterThan(0); + expect(result[0]).toHaveProperty("id"); + expect(result[0]).toHaveProperty("name"); + expect(result[0]).not.toHaveProperty("age"); + expect(result[0]).toEqual({ id: "1", name: "John" }); +}); + +test("Execute SQL Query with WHERE Clause", async () => { + const query = "SELECT id, name FROM student WHERE age = 25"; + const result = await executeSELECTQuery(query); + expect(result.length).toBe(1); + expect(result[0]).toHaveProperty("id"); + expect(result[0]).toHaveProperty("name"); + expect(result[0].id).toBe("2"); +}); + +test("Execute SQL Query with Complex WHERE Clause", async () => { + const query = "SELECT id, name FROM student WHERE age = 30 AND name = John"; + const result = await executeSELECTQuery(query); + expect(result.length).toBe(1); + expect(result[0]).toEqual({ id: "1", name: "John" }); +}); + +test("Execute SQL Query with Greater Than", async () => { + const queryWithGT = "SELECT id FROM student WHERE age > 22"; + const result = await executeSELECTQuery(queryWithGT); + expect(result.length).toEqual(3); + expect(result[0]).toHaveProperty("id"); +}); + +test("Execute SQL Query with Not Equal to", async () => { + const queryWithGT = "SELECT name FROM student WHERE age != 25"; + const result = await executeSELECTQuery(queryWithGT); + expect(result.length).toEqual(3); + expect(result[0]).toHaveProperty("name"); +}); + +test("Execute SQL Query with INNER JOIN", async () => { + const query = + "SELECT student.name, enrollment.course FROM student INNER JOIN enrollment ON student.id=enrollment.student_id"; + const result = await executeSELECTQuery(query); + /* result = [ { 'student.name': 'John', 'enrollment.course': 'Mathematics' }, { 'student.name': 'John', 'enrollment.course': 'Physics' }, @@ -61,661 +62,740 @@ test('Execute SQL Query with INNER JOIN', async () => { { 'student.name': 'Bob', 'enrollment.course': 'Mathematics' } ] */ - expect(result.length).toEqual(4); - // toHaveProperty is not working here due to dot in the property name - expect(result[0]).toEqual(expect.objectContaining({ - "enrollment.course": "Mathematics", - "student.name": "John" - })); + expect(result.length).toEqual(4); + // toHaveProperty is not working here due to dot in the property name + expect(result[0]).toEqual( + expect.objectContaining({ + "enrollment.course": "Mathematics", + "student.name": "John", + }) + ); }); -test('Execute SQL Query with INNER JOIN and a WHERE Clause', async () => { - const query = 'SELECT student.name, enrollment.course, student.age FROM student INNER JOIN enrollment ON student.id = enrollment.student_id WHERE student.age > 25'; - const result = await executeSELECTQuery(query); - /* +test("Execute SQL Query with INNER JOIN and a WHERE Clause", async () => { + const query = + "SELECT student.name, enrollment.course, student.age FROM student INNER JOIN enrollment ON student.id = enrollment.student_id WHERE student.age > 25"; + const result = await executeSELECTQuery(query); + /* result = [ { 'student.name': 'John', - 'enrollment.course': 'Mathematics', - 'student.age': '30' - }, - { - 'student.name': 'John', - 'enrollment.course': 'Physics', - 'student.age': '30' + @@ -86,636 +90,718 @@ test('Execute SQL Query with INNER JOIN and a WHERE Clause', async () => { } ] */ - expect(result.length).toEqual(2); - // toHaveProperty is not working here due to dot in the property name - expect(result[0]).toEqual(expect.objectContaining({ - "enrollment.course": "Mathematics", - "student.name": "John" - })); -}); - -test('Execute SQL Query with LEFT JOIN', async () => { - const query = 'SELECT student.name, enrollment.course FROM student LEFT JOIN enrollment ON student.id=enrollment.student_id'; - const result = await executeSELECTQuery(query); - expect(result).toEqual(expect.arrayContaining([ - expect.objectContaining({ "student.name": "Alice", "enrollment.course": null }), - expect.objectContaining({ "student.name": "John", "enrollment.course": "Mathematics" }) - ])); - expect(result.length).toEqual(5); // 4 students, but John appears twice -}); - -test('Execute SQL Query with RIGHT JOIN', async () => { - const query = 'SELECT student.name, enrollment.course FROM student RIGHT JOIN enrollment ON student.id=enrollment.student_id'; - const result = await executeSELECTQuery(query); - expect(result).toEqual(expect.arrayContaining([ - expect.objectContaining({ "student.name": null, "enrollment.course": "Biology" }), - expect.objectContaining({ "student.name": "John", "enrollment.course": "Mathematics" }) - ])); - expect(result.length).toEqual(5); // 4 courses, but Mathematics appears twice -}); - -test('Execute SQL Query with LEFT JOIN with a WHERE clause filtering the main table', async () => { - const query = 'SELECT student.name, enrollment.course FROM student LEFT JOIN enrollment ON student.id=enrollment.student_id WHERE student.age > 22'; - const result = await executeSELECTQuery(query); - expect(result).toEqual(expect.arrayContaining([ - expect.objectContaining({ "enrollment.course": "Mathematics", "student.name": "John" }), - expect.objectContaining({ "enrollment.course": "Physics", "student.name": "John" }) - ])); - expect(result.length).toEqual(4); -}); - -test('Execute SQL Query with LEFT JOIN with a WHERE clause filtering the join table', async () => { - const query = `SELECT student.name, enrollment.course FROM student LEFT JOIN enrollment ON student.id=enrollment.student_id WHERE enrollment.course = 'Physics'`; - const result = await executeSELECTQuery(query); - expect(result).toEqual(expect.arrayContaining([ - expect.objectContaining({ "student.name": "John", "enrollment.course": "Physics" }) - ])); - expect(result.length).toEqual(1); -}); - -test('Execute SQL Query with RIGHT JOIN with a WHERE clause filtering the main table', async () => { - const query = 'SELECT student.name, enrollment.course FROM student RIGHT JOIN enrollment ON student.id=enrollment.student_id WHERE student.age < 25'; - const result = await executeSELECTQuery(query); - expect(result).toEqual(expect.arrayContaining([ - expect.objectContaining({ "enrollment.course": "Mathematics", "student.name": "Bob" }), - expect.objectContaining({ "enrollment.course": "Biology", "student.name": null }) - ])); - expect(result.length).toEqual(2); -}); - -test('Execute SQL Query with RIGHT JOIN with a WHERE clause filtering the join table', async () => { - const query = `SELECT student.name, enrollment.course FROM student RIGHT JOIN enrollment ON student.id=enrollment.student_id WHERE enrollment.course = 'Chemistry'`; - const result = await executeSELECTQuery(query); - expect(result).toEqual(expect.arrayContaining([ - expect.objectContaining({ "enrollment.course": "Chemistry", "student.name": "Jane" }), - ])); - expect(result.length).toEqual(1); -}); - -test('Execute SQL Query with RIGHT JOIN with a multiple WHERE clauses filtering the join table and main table', async () => { - const query = `SELECT student.name, enrollment.course FROM student RIGHT JOIN enrollment ON student.id=enrollment.student_id WHERE enrollment.course = 'Chemistry' AND student.age = 26`; - const result = await executeSELECTQuery(query); - expect(result).toEqual([]); -}); - -test('Execute COUNT Aggregate Query', async () => { - const query = 'SELECT COUNT(*) FROM student'; - const result = await executeSELECTQuery(query); - expect(result).toEqual([{ 'COUNT(*)': 4 }]); -}); - -test('Execute SUM Aggregate Query', async () => { - const query = 'SELECT SUM(age) FROM student'; - const result = await executeSELECTQuery(query); - expect(result).toEqual([{ 'SUM(age)': 101 }]); -}); - -test('Execute AVG Aggregate Query', async () => { - const query = 'SELECT AVG(age) FROM student'; - const result = await executeSELECTQuery(query); - // Assuming AVG returns a single decimal point value - expect(result).toEqual([{ 'AVG(age)': 25.25 }]); -}); - -test('Execute MIN Aggregate Query', async () => { - const query = 'SELECT MIN(age) FROM student'; - const result = await executeSELECTQuery(query); - expect(result).toEqual([{ 'MIN(age)': 22 }]); -}); - -test('Execute MAX Aggregate Query', async () => { - const query = 'SELECT MAX(age) FROM student'; - const result = await executeSELECTQuery(query); - expect(result).toEqual([{ 'MAX(age)': 30 }]); -}); - -test('Count students per age', async () => { - const query = 'SELECT age, COUNT(*) FROM student GROUP BY age'; - const result = await executeSELECTQuery(query); - expect(result).toEqual([ - { age: '22', 'COUNT(*)': 1 }, - { age: '24', 'COUNT(*)': 1 }, - { age: '25', 'COUNT(*)': 1 }, - { age: '30', 'COUNT(*)': 1 } - ]); -}); - -test('Count enrollments per course', async () => { - const query = 'SELECT course, COUNT(*) FROM enrollment GROUP BY course'; - const result = await executeSELECTQuery(query); - expect(result).toEqual([ - { course: 'Mathematics', 'COUNT(*)': 2 }, - { course: 'Physics', 'COUNT(*)': 1 }, - { course: 'Chemistry', 'COUNT(*)': 1 }, - { course: 'Biology', 'COUNT(*)': 1 } - ]); -}); - - -test('Count courses per student', async () => { - const query = 'SELECT student_id, COUNT(*) FROM enrollment GROUP BY student_id'; - const result = await executeSELECTQuery(query); - expect(result).toEqual([ - { student_id: '1', 'COUNT(*)': 2 }, - { student_id: '2', 'COUNT(*)': 1 }, - { student_id: '3', 'COUNT(*)': 1 }, - { student_id: '5', 'COUNT(*)': 1 } - ]); -}); - -test('Count students within a specific age range', async () => { - const query = 'SELECT age, COUNT(*) FROM student WHERE age > 22 GROUP BY age'; - const result = await executeSELECTQuery(query); - expect(result).toEqual([ - { age: '24', 'COUNT(*)': 1 }, - { age: '25', 'COUNT(*)': 1 }, - { age: '30', 'COUNT(*)': 1 } - ]); -}); - -test('Count enrollments for a specific course', async () => { - const query = 'SELECT course, COUNT(*) FROM enrollment WHERE course = "Mathematics" GROUP BY course'; - const result = await executeSELECTQuery(query); - expect(result).toEqual([ - { course: 'Mathematics', 'COUNT(*)': 2 } - ]); -}); - -test('Count courses for a specific student', async () => { - const query = 'SELECT student_id, COUNT(*) FROM enrollment WHERE student_id = 1 GROUP BY student_id'; - const result = await executeSELECTQuery(query); - expect(result).toEqual([ - { student_id: '1', 'COUNT(*)': 2 } - ]); -}); - -test('Average age of students above a certain age', async () => { - const query = 'SELECT AVG(age) FROM student WHERE age > 22'; - const result = await executeSELECTQuery(query); - const expectedAverage = (25 + 30 + 24) / 3; // Average age of students older than 22 - expect(result).toEqual([{ 'AVG(age)': expectedAverage }]); -}); - -test('Parse SQL Query', () => { - const query = 'SELECT id, name FROM student'; - const parsed = parseQuery(query); - expect(parsed).toEqual({ - fields: ['id', 'name'], - table: 'student', - whereClauses: [], - joinCondition: null, - joinTable: null, - joinType: null, - groupByFields: null, - hasAggregateWithoutGroupBy: false, - "orderByFields": null, - "limit": null - }); -}); - -test('Parse SQL Query with WHERE Clause', () => { - const query = 'SELECT id, name FROM student WHERE age = 25'; - const parsed = parseQuery(query); - expect(parsed).toEqual({ - fields: ['id', 'name'], - table: 'student', - whereClauses: [{ - "field": "age", - "operator": "=", - "value": "25", - }], - joinCondition: null, - joinTable: null, - joinType: null, - groupByFields: null, - hasAggregateWithoutGroupBy: false, - "orderByFields": null, - "limit": null - }); -}); - -test('Parse SQL Query with Multiple WHERE Clauses', () => { - const query = 'SELECT id, name FROM student WHERE age = 30 AND name = John'; - const parsed = parseQuery(query); - expect(parsed).toEqual({ - fields: ['id', 'name'], - table: 'student', - whereClauses: [{ - "field": "age", - "operator": "=", - "value": "30", - }, { - "field": "name", - "operator": "=", - "value": "John", - }], - joinCondition: null, - joinTable: null, - joinType: null, - groupByFields: null, - hasAggregateWithoutGroupBy: false, - "orderByFields": null, - "limit": null - }); -}); - -test('Parse SQL Query with INNER JOIN', async () => { - const query = 'SELECT student.name, enrollment.course FROM student INNER JOIN enrollment ON student.id=enrollment.student_id'; - const result = await parseQuery(query); - expect(result).toEqual({ - fields: ['student.name', 'enrollment.course'], - table: 'student', - whereClauses: [], - joinTable: 'enrollment', - joinType: "INNER", - joinCondition: { left: 'student.id', right: 'enrollment.student_id' }, - groupByFields: null, - hasAggregateWithoutGroupBy: false, - "orderByFields": null, - "limit": null - }) -}); - -test('Parse SQL Query with INNER JOIN and WHERE Clause', async () => { - const query = 'SELECT student.name, enrollment.course FROM student INNER JOIN enrollment ON student.id = enrollment.student_id WHERE student.age > 20'; - const result = await parseQuery(query); - expect(result).toEqual({ - fields: ['student.name', 'enrollment.course'], - table: 'student', - whereClauses: [{ field: 'student.age', operator: '>', value: '20' }], - joinTable: 'enrollment', - joinType: "INNER", - joinCondition: { left: 'student.id', right: 'enrollment.student_id' }, - groupByFields: null, - hasAggregateWithoutGroupBy: false, - "orderByFields": null, - "limit": null + expect(result.length).toEqual(2); + // toHaveProperty is not working here due to dot in the property name + expect(result[0]).toEqual( + expect.objectContaining({ + "enrollment.course": "Mathematics", + "student.name": "John", }) + ); +}); + +test("Execute SQL Query with LEFT JOIN", async () => { + const query = + "SELECT student.name, enrollment.course FROM student LEFT JOIN enrollment ON student.id=enrollment.student_id"; + const result = await executeSELECTQuery(query); + expect(result).toEqual( + expect.arrayContaining([ + expect.objectContaining({ + "student.name": "Alice", + "enrollment.course": null, + }), + expect.objectContaining({ + "student.name": "John", + "enrollment.course": "Mathematics", + }), + ]) + ); + expect(result.length).toEqual(5); // 4 students, but John appears twice +}); + +test("Execute SQL Query with RIGHT JOIN", async () => { + const query = + "SELECT student.name, enrollment.course FROM student RIGHT JOIN enrollment ON student.id=enrollment.student_id"; + const result = await executeSELECTQuery(query); + expect(result).toEqual( + expect.arrayContaining([ + expect.objectContaining({ + "student.name": null, + "enrollment.course": "Biology", + }), + expect.objectContaining({ + "student.name": "John", + "enrollment.course": "Mathematics", + }), + ]) + ); + expect(result.length).toEqual(5); // 4 courses, but Mathematics appears twice +}); + +test("Execute SQL Query with LEFT JOIN with a WHERE clause filtering the main table", async () => { + const query = + "SELECT student.name, enrollment.course FROM student LEFT JOIN enrollment ON student.id=enrollment.student_id WHERE student.age > 22"; + const result = await executeSELECTQuery(query); + expect(result).toEqual( + expect.arrayContaining([ + expect.objectContaining({ + "enrollment.course": "Mathematics", + "student.name": "John", + }), + expect.objectContaining({ + "enrollment.course": "Physics", + "student.name": "John", + }), + ]) + ); + expect(result.length).toEqual(4); +}); + +test("Execute SQL Query with LEFT JOIN with a WHERE clause filtering the join table", async () => { + const query = `SELECT student.name, enrollment.course FROM student LEFT JOIN enrollment ON student.id=enrollment.student_id WHERE enrollment.course = 'Physics'`; + const result = await executeSELECTQuery(query); + expect(result).toEqual( + expect.arrayContaining([ + expect.objectContaining({ + "student.name": "John", + "enrollment.course": "Physics", + }), + ]) + ); + expect(result.length).toEqual(1); +}); + +test("Execute SQL Query with RIGHT JOIN with a WHERE clause filtering the main table", async () => { + const query = + "SELECT student.name, enrollment.course FROM student RIGHT JOIN enrollment ON student.id=enrollment.student_id WHERE student.age < 25"; + const result = await executeSELECTQuery(query); + expect(result).toEqual( + expect.arrayContaining([ + expect.objectContaining({ + "enrollment.course": "Mathematics", + "student.name": "Bob", + }), + expect.objectContaining({ + "enrollment.course": "Biology", + "student.name": null, + }), + ]) + ); + expect(result.length).toEqual(2); +}); + +test("Execute SQL Query with RIGHT JOIN with a WHERE clause filtering the join table", async () => { + const query = `SELECT student.name, enrollment.course FROM student RIGHT JOIN enrollment ON student.id=enrollment.student_id WHERE enrollment.course = 'Chemistry'`; + const result = await executeSELECTQuery(query); + expect(result).toEqual( + expect.arrayContaining([ + expect.objectContaining({ + "enrollment.course": "Chemistry", + "student.name": "Jane", + }), + ]) + ); + expect(result.length).toEqual(1); +}); + +test("Execute SQL Query with RIGHT JOIN with a multiple WHERE clauses filtering the join table and main table", async () => { + const query = `SELECT student.name, enrollment.course FROM student RIGHT JOIN enrollment ON student.id=enrollment.student_id WHERE enrollment.course = 'Chemistry' AND student.age = 26`; + const result = await executeSELECTQuery(query); + expect(result).toEqual([]); +}); + +test("Execute COUNT Aggregate Query", async () => { + const query = "SELECT COUNT(*) FROM student"; + const result = await executeSELECTQuery(query); + expect(result).toEqual([{ "COUNT(*)": 4 }]); +}); + +test("Execute SUM Aggregate Query", async () => { + const query = "SELECT SUM(age) FROM student"; + const result = await executeSELECTQuery(query); + expect(result).toEqual([{ "SUM(age)": 101 }]); +}); + +test("Execute AVG Aggregate Query", async () => { + const query = "SELECT AVG(age) FROM student"; + const result = await executeSELECTQuery(query); + // Assuming AVG returns a single decimal point value + expect(result).toEqual([{ "AVG(age)": 25.25 }]); +}); + +test("Execute MIN Aggregate Query", async () => { + const query = "SELECT MIN(age) FROM student"; + const result = await executeSELECTQuery(query); + expect(result).toEqual([{ "MIN(age)": 22 }]); +}); + +test("Execute MAX Aggregate Query", async () => { + const query = "SELECT MAX(age) FROM student"; + const result = await executeSELECTQuery(query); + expect(result).toEqual([{ "MAX(age)": 30 }]); +}); + +test("Count students per age", async () => { + const query = "SELECT age, COUNT(*) FROM student GROUP BY age"; + const result = await executeSELECTQuery(query); + expect(result).toEqual([ + { age: "22", "COUNT(*)": 1 }, + { age: "24", "COUNT(*)": 1 }, + { age: "25", "COUNT(*)": 1 }, + { age: "30", "COUNT(*)": 1 }, + ]); +}); + +test("Count enrollments per course", async () => { + const query = "SELECT course, COUNT(*) FROM enrollment GROUP BY course"; + const result = await executeSELECTQuery(query); + expect(result).toEqual([ + { course: "Mathematics", "COUNT(*)": 2 }, + { course: "Physics", "COUNT(*)": 1 }, + { course: "Chemistry", "COUNT(*)": 1 }, + { course: "Biology", "COUNT(*)": 1 }, + ]); +}); + +test("Count courses per student", async () => { + const query = + "SELECT student_id, COUNT(*) FROM enrollment GROUP BY student_id"; + const result = await executeSELECTQuery(query); + expect(result).toEqual([ + { student_id: "1", "COUNT(*)": 2 }, + { student_id: "2", "COUNT(*)": 1 }, + { student_id: "3", "COUNT(*)": 1 }, + { student_id: "5", "COUNT(*)": 1 }, + ]); +}); + +test("Count students within a specific age range", async () => { + const query = "SELECT age, COUNT(*) FROM student WHERE age > 22 GROUP BY age"; + const result = await executeSELECTQuery(query); + expect(result).toEqual([ + { age: "24", "COUNT(*)": 1 }, + { age: "25", "COUNT(*)": 1 }, + { age: "30", "COUNT(*)": 1 }, + ]); +}); + +test("Count enrollments for a specific course", async () => { + const query = + 'SELECT course, COUNT(*) FROM enrollment WHERE course = "Mathematics" GROUP BY course'; + const result = await executeSELECTQuery(query); + expect(result).toEqual([{ course: "Mathematics", "COUNT(*)": 2 }]); +}); + +test("Count courses for a specific student", async () => { + const query = + "SELECT student_id, COUNT(*) FROM enrollment WHERE student_id = 1 GROUP BY student_id"; + const result = await executeSELECTQuery(query); + expect(result).toEqual([{ student_id: "1", "COUNT(*)": 2 }]); +}); + +test("Average age of students above a certain age", async () => { + const query = "SELECT AVG(age) FROM student WHERE age > 22"; + const result = await executeSELECTQuery(query); + const expectedAverage = (25 + 30 + 24) / 3; // Average age of students older than 22 + expect(result).toEqual([{ "AVG(age)": expectedAverage }]); +}); + +test("Parse SQL Query", () => { + const query = "SELECT id, name FROM student"; + const parsed = parseSelectQuery(query); + expect(parsed).toEqual({ + fields: ["id", "name"], + table: "student", + whereClauses: [], + joinCondition: null, + joinTable: null, + joinType: null, + groupByFields: null, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse SQL Query with WHERE Clause", () => { + const query = "SELECT id, name FROM student WHERE age = 25"; + const parsed = parseSelectQuery(query); + expect(parsed).toEqual({ + fields: ["id", "name"], + table: "student", + whereClauses: [ + { + field: "age", + operator: "=", + value: "25", + }, + ], + joinCondition: null, + joinTable: null, + joinType: null, + groupByFields: null, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse SQL Query with Multiple WHERE Clauses", () => { + const query = "SELECT id, name FROM student WHERE age = 30 AND name = John"; + const parsed = parseSelectQuery(query); + expect(parsed).toEqual({ + fields: ["id", "name"], + table: "student", + whereClauses: [ + { + field: "age", + operator: "=", + value: "30", + }, + { + field: "name", + operator: "=", + value: "John", + }, + ], + joinCondition: null, + joinTable: null, + joinType: null, + groupByFields: null, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse SQL Query with INNER JOIN", async () => { + const query = + "SELECT student.name, enrollment.course FROM student INNER JOIN enrollment ON student.id=enrollment.student_id"; + const result = await parseSelectQuery(query); + expect(result).toEqual({ + fields: ["student.name", "enrollment.course"], + table: "student", + whereClauses: [], + joinTable: "enrollment", + joinType: "INNER", + joinCondition: { left: "student.id", right: "enrollment.student_id" }, + groupByFields: null, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse SQL Query with INNER JOIN and WHERE Clause", async () => { + const query = + "SELECT student.name, enrollment.course FROM student INNER JOIN enrollment ON student.id = enrollment.student_id WHERE student.age > 20"; + const result = await parseSelectQuery(query); + expect(result).toEqual({ + fields: ["student.name", "enrollment.course"], + table: "student", + whereClauses: [{ field: "student.age", operator: ">", value: "20" }], + joinTable: "enrollment", + joinType: "INNER", + joinCondition: { left: "student.id", right: "enrollment.student_id" }, + groupByFields: null, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse INNER JOIN clause", () => { + const query = + "SELECT * FROM table1 INNER JOIN table2 ON table1.id = table2.ref_id"; + const result = parseJoinClause(query); + expect(result).toEqual({ + joinType: "INNER", + joinTable: "table2", + joinCondition: { left: "table1.id", right: "table2.ref_id" }, + }); +}); + +test("Parse LEFT JOIN clause", () => { + const query = + "SELECT * FROM table1 LEFT JOIN table2 ON table1.id = table2.ref_id"; + const result = parseJoinClause(query); + expect(result).toEqual({ + joinType: "LEFT", + joinTable: "table2", + joinCondition: { left: "table1.id", right: "table2.ref_id" }, + }); +}); + +test("Parse RIGHT JOIN clause", () => { + const query = + "SELECT * FROM table1 RIGHT JOIN table2 ON table1.id = table2.ref_id"; + const result = parseJoinClause(query); + expect(result).toEqual({ + joinType: "RIGHT", + joinTable: "table2", + joinCondition: { left: "table1.id", right: "table2.ref_id" }, + }); +}); + +test("Returns null for queries without JOIN", () => { + const query = "SELECT * FROM table1"; + const result = parseJoinClause(query); + expect(result).toEqual({ + joinType: null, + joinTable: null, + joinCondition: null, + }); +}); + +test("Parse LEFT Join Query Completely", () => { + const query = + "SELECT student.name, enrollment.course FROM student LEFT JOIN enrollment ON student.id=enrollment.student_id"; + const result = parseSelectQuery(query); + expect(result).toEqual({ + fields: ["student.name", "enrollment.course"], + table: "student", + whereClauses: [], + joinType: "LEFT", + joinTable: "enrollment", + joinCondition: { left: "student.id", right: "enrollment.student_id" }, + groupByFields: null, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse LEFT Join Query Completely", () => { + const query = + "SELECT student.name, enrollment.course FROM student RIGHT JOIN enrollment ON student.id=enrollment.student_id"; + const result = parseSelectQuery(query); + expect(result).toEqual({ + fields: ["student.name", "enrollment.course"], + table: "student", + whereClauses: [], + joinType: "RIGHT", + joinTable: "enrollment", + joinCondition: { left: "student.id", right: "enrollment.student_id" }, + groupByFields: null, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse SQL Query with LEFT JOIN with a WHERE clause filtering the main table", async () => { + const query = + "SELECT student.name, enrollment.course FROM student LEFT JOIN enrollment ON student.id=enrollment.student_id WHERE student.age > 22"; + const result = await parseSelectQuery(query); + expect(result).toEqual({ + fields: ["student.name", "enrollment.course"], + joinCondition: { left: "student.id", right: "enrollment.student_id" }, + joinTable: "enrollment", + joinType: "LEFT", + table: "student", + whereClauses: [{ field: "student.age", operator: ">", value: "22" }], + groupByFields: null, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse SQL Query with LEFT JOIN with a WHERE clause filtering the join table", async () => { + const query = `SELECT student.name, enrollment.course FROM student LEFT JOIN enrollment ON student.id=enrollment.student_id WHERE enrollment.course = 'Physics'`; + const result = await parseSelectQuery(query); + expect(result).toEqual({ + fields: ["student.name", "enrollment.course"], + joinCondition: { left: "student.id", right: "enrollment.student_id" }, + joinTable: "enrollment", + joinType: "LEFT", + table: "student", + whereClauses: [ + { field: "enrollment.course", operator: "=", value: "'Physics'" }, + ], + groupByFields: null, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse SQL Query with RIGHT JOIN with a WHERE clause filtering the main table", async () => { + const query = + "SELECT student.name, enrollment.course FROM student RIGHT JOIN enrollment ON student.id=enrollment.student_id WHERE student.age < 25"; + const result = await parseSelectQuery(query); + expect(result).toEqual({ + fields: ["student.name", "enrollment.course"], + joinCondition: { left: "student.id", right: "enrollment.student_id" }, + joinTable: "enrollment", + joinType: "RIGHT", + table: "student", + whereClauses: [{ field: "student.age", operator: "<", value: "25" }], + groupByFields: null, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse SQL Query with RIGHT JOIN with a WHERE clause filtering the join table", async () => { + const query = `SELECT student.name, enrollment.course FROM student RIGHT JOIN enrollment ON student.id=enrollment.student_id WHERE enrollment.course = 'Chemistry'`; + const result = await parseSelectQuery(query); + expect(result).toEqual({ + fields: ["student.name", "enrollment.course"], + joinCondition: { left: "student.id", right: "enrollment.student_id" }, + joinTable: "enrollment", + joinType: "RIGHT", + table: "student", + whereClauses: [ + { field: "enrollment.course", operator: "=", value: "'Chemistry'" }, + ], + groupByFields: null, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse COUNT Aggregate Query", () => { + const query = "SELECT COUNT(*) FROM student"; + const parsed = parseSelectQuery(query); + expect(parsed).toEqual({ + fields: ["COUNT(*)"], + table: "student", + whereClauses: [], + groupByFields: null, + hasAggregateWithoutGroupBy: true, + joinCondition: null, + joinTable: null, + joinType: null, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse SUM Aggregate Query", () => { + const query = "SELECT SUM(age) FROM student"; + const parsed = parseSelectQuery(query); + expect(parsed).toEqual({ + fields: ["SUM(age)"], + table: "student", + whereClauses: [], + groupByFields: null, + hasAggregateWithoutGroupBy: true, + joinCondition: null, + joinTable: null, + joinType: null, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse AVG Aggregate Query", () => { + const query = "SELECT AVG(age) FROM student"; + const parsed = parseSelectQuery(query); + expect(parsed).toEqual({ + fields: ["AVG(age)"], + table: "student", + whereClauses: [], + groupByFields: null, + hasAggregateWithoutGroupBy: true, + joinCondition: null, + joinTable: null, + joinType: null, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse MIN Aggregate Query", () => { + const query = "SELECT MIN(age) FROM student"; + const parsed = parseSelectQuery(query); + expect(parsed).toEqual({ + fields: ["MIN(age)"], + table: "student", + whereClauses: [], + groupByFields: null, + hasAggregateWithoutGroupBy: true, + joinCondition: null, + joinTable: null, + joinType: null, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse MAX Aggregate Query", () => { + const query = "SELECT MAX(age) FROM student"; + const parsed = parseSelectQuery(query); + expect(parsed).toEqual({ + fields: ["MAX(age)"], + table: "student", + whereClauses: [], + groupByFields: null, + hasAggregateWithoutGroupBy: true, + joinCondition: null, + joinTable: null, + joinType: null, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse basic GROUP BY query", () => { + const query = "SELECT age, COUNT(*) FROM student GROUP BY age"; + const parsed = parseSelectQuery(query); + expect(parsed).toEqual({ + fields: ["age", "COUNT(*)"], + table: "student", + whereClauses: [], + groupByFields: ["age"], + joinType: null, + joinTable: null, + joinCondition: null, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse GROUP BY query with WHERE clause", () => { + const query = "SELECT age, COUNT(*) FROM student WHERE age > 22 GROUP BY age"; + const parsed = parseSelectQuery(query); + expect(parsed).toEqual({ + fields: ["age", "COUNT(*)"], + table: "student", + whereClauses: [{ field: "age", operator: ">", value: "22" }], + groupByFields: ["age"], + joinType: null, + joinTable: null, + joinCondition: null, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse GROUP BY query with multiple fields", () => { + const query = + "SELECT student_id, course, COUNT(*) FROM enrollment GROUP BY student_id, course"; + const parsed = parseSelectQuery(query); + expect(parsed).toEqual({ + fields: ["student_id", "course", "COUNT(*)"], + table: "enrollment", + whereClauses: [], + groupByFields: ["student_id", "course"], + joinType: null, + joinTable: null, + joinCondition: null, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse GROUP BY query with JOIN and WHERE clauses", () => { + const query = + 'SELECT student.name, COUNT(*) FROM student INNER JOIN enrollment ON student.id = enrollment.student_id WHERE enrollment.course = "Mathematics" GROUP BY student.name'; + const parsed = parseSelectQuery(query); + expect(parsed).toEqual({ + fields: ["student.name", "COUNT(*)"], + table: "student", + whereClauses: [ + { field: "enrollment.course", operator: "=", value: '"Mathematics"' }, + ], + groupByFields: ["student.name"], + joinType: "INNER", + joinTable: "enrollment", + joinCondition: { + left: "student.id", + right: "enrollment.student_id", + }, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Execute SQL Query with ORDER BY", async () => { + const query = "SELECT name FROM student ORDER BY name ASC"; + const result = await executeSELECTQuery(query); + + expect(result).toStrictEqual([ + { name: "Alice" }, + { name: "Bob" }, + { name: "Jane" }, + { name: "John" }, + ]); +}); + +test("Execute SQL Query with ORDER BY and WHERE", async () => { + const query = "SELECT name FROM student WHERE age > 24 ORDER BY name DESC"; + const result = await executeSELECTQuery(query); + + expect(result).toStrictEqual([{ name: "John" }, { name: "Jane" }]); +}); +test("Execute SQL Query with ORDER BY and GROUP BY", async () => { + const query = + "SELECT COUNT(id) as count, age FROM student GROUP BY age ORDER BY age DESC"; + const result = await executeSELECTQuery(query); + + expect(result).toStrictEqual([ + { age: "30", "COUNT(id) as count": 1 }, + { age: "25", "COUNT(id) as count": 1 }, + { age: "24", "COUNT(id) as count": 1 }, + { age: "22", "COUNT(id) as count": 1 }, + ]); +}); + +test("Execute SQL Query with standard LIMIT clause", async () => { + const query = "SELECT id, name FROM student LIMIT 2"; + const result = await executeSELECTQuery(query); + expect(result.length).toEqual(2); +}); + +test("Execute SQL Query with LIMIT clause equal to total rows", async () => { + const query = "SELECT id, name FROM student LIMIT 4"; + const result = await executeSELECTQuery(query); + expect(result.length).toEqual(4); +}); + +test("Execute SQL Query with LIMIT clause exceeding total rows", async () => { + const query = "SELECT id, name FROM student LIMIT 10"; + const result = await executeSELECTQuery(query); + expect(result.length).toEqual(4); // Total rows in student.csv +}); + +test("Execute SQL Query with LIMIT 0", async () => { + const query = "SELECT id, name FROM student LIMIT 0"; + const result = await executeSELECTQuery(query); + expect(result.length).toEqual(0); +}); + +test("Execute SQL Query with LIMIT and ORDER BY clause", async () => { + const query = "SELECT id, name FROM student ORDER BY age DESC LIMIT 2"; + const result = await executeSELECTQuery(query); + expect(result.length).toEqual(2); + expect(result[0].name).toEqual("John"); + expect(result[1].name).toEqual("Jane"); }); - -test('Parse INNER JOIN clause', () => { - const query = 'SELECT * FROM table1 INNER JOIN table2 ON table1.id = table2.ref_id'; - const result = parseJoinClause(query); - expect(result).toEqual({ - joinType: 'INNER', - joinTable: 'table2', - joinCondition: { left: 'table1.id', right: 'table2.ref_id' }, - }); -}); - -test('Parse LEFT JOIN clause', () => { - const query = 'SELECT * FROM table1 LEFT JOIN table2 ON table1.id = table2.ref_id'; - const result = parseJoinClause(query); - expect(result).toEqual({ - joinType: 'LEFT', - joinTable: 'table2', - joinCondition: { left: 'table1.id', right: 'table2.ref_id' } - }); -}); - -test('Parse RIGHT JOIN clause', () => { - const query = 'SELECT * FROM table1 RIGHT JOIN table2 ON table1.id = table2.ref_id'; - const result = parseJoinClause(query); - expect(result).toEqual({ - joinType: 'RIGHT', - joinTable: 'table2', - joinCondition: { left: 'table1.id', right: 'table2.ref_id' } - }); -}); - -test('Returns null for queries without JOIN', () => { - const query = 'SELECT * FROM table1'; - const result = parseJoinClause(query); - expect(result).toEqual( - { - joinType: null, - joinTable: null, - joinCondition: null - } - ); -}); - -test('Parse LEFT Join Query Completely', () => { - const query = 'SELECT student.name, enrollment.course FROM student LEFT JOIN enrollment ON student.id=enrollment.student_id'; - const result = parseQuery(query); - expect(result).toEqual({ - fields: ['student.name', 'enrollment.course'], - table: 'student', - whereClauses: [], - joinType: 'LEFT', - joinTable: 'enrollment', - joinCondition: { left: 'student.id', right: 'enrollment.student_id' }, - groupByFields: null, - hasAggregateWithoutGroupBy: false, - "orderByFields": null, - "limit": null - }) -}) - -test('Parse LEFT Join Query Completely', () => { - const query = 'SELECT student.name, enrollment.course FROM student RIGHT JOIN enrollment ON student.id=enrollment.student_id'; - const result = parseQuery(query); - expect(result).toEqual({ - fields: ['student.name', 'enrollment.course'], - table: 'student', - whereClauses: [], - joinType: 'RIGHT', - joinTable: 'enrollment', - joinCondition: { left: 'student.id', right: 'enrollment.student_id' }, - groupByFields: null, - hasAggregateWithoutGroupBy: false, - "orderByFields": null, - "limit": null - }) -}) - -test('Parse SQL Query with LEFT JOIN with a WHERE clause filtering the main table', async () => { - const query = 'SELECT student.name, enrollment.course FROM student LEFT JOIN enrollment ON student.id=enrollment.student_id WHERE student.age > 22'; - const result = await parseQuery(query); - expect(result).toEqual({ - "fields": ["student.name", "enrollment.course"], - "joinCondition": { "left": "student.id", "right": "enrollment.student_id" }, - "joinTable": "enrollment", - "joinType": "LEFT", - "table": "student", - "whereClauses": [{ "field": "student.age", "operator": ">", "value": "22" }], - groupByFields: null, - hasAggregateWithoutGroupBy: false, - "orderByFields": null, - "limit": null - }); -}); - -test('Parse SQL Query with LEFT JOIN with a WHERE clause filtering the join table', async () => { - const query = `SELECT student.name, enrollment.course FROM student LEFT JOIN enrollment ON student.id=enrollment.student_id WHERE enrollment.course = 'Physics'`; - const result = await parseQuery(query); - expect(result).toEqual({ - "fields": ["student.name", "enrollment.course"], - "joinCondition": { "left": "student.id", "right": "enrollment.student_id" }, - "joinTable": "enrollment", - "joinType": "LEFT", - "table": "student", - "whereClauses": [{ "field": "enrollment.course", "operator": "=", "value": "'Physics'" }], - groupByFields: null, - hasAggregateWithoutGroupBy: false, - "orderByFields": null, - "limit": null - }); -}); - -test('Parse SQL Query with RIGHT JOIN with a WHERE clause filtering the main table', async () => { - const query = 'SELECT student.name, enrollment.course FROM student RIGHT JOIN enrollment ON student.id=enrollment.student_id WHERE student.age < 25'; - const result = await parseQuery(query); - expect(result).toEqual({ - "fields": ["student.name", "enrollment.course"], - "joinCondition": { "left": "student.id", "right": "enrollment.student_id" }, - "joinTable": "enrollment", - "joinType": "RIGHT", - "table": "student", - "whereClauses": [{ "field": "student.age", "operator": "<", "value": "25" }], - groupByFields: null, - hasAggregateWithoutGroupBy: false, - "orderByFields": null, - "limit": null - }); -}); - -test('Parse SQL Query with RIGHT JOIN with a WHERE clause filtering the join table', async () => { - const query = `SELECT student.name, enrollment.course FROM student RIGHT JOIN enrollment ON student.id=enrollment.student_id WHERE enrollment.course = 'Chemistry'`; - const result = await parseQuery(query); - expect(result).toEqual({ - "fields": ["student.name", "enrollment.course"], - "joinCondition": { "left": "student.id", "right": "enrollment.student_id" }, - "joinTable": "enrollment", - "joinType": "RIGHT", - "table": "student", - "whereClauses": [{ "field": "enrollment.course", "operator": "=", "value": "'Chemistry'" }], - groupByFields: null, - hasAggregateWithoutGroupBy: false, - "orderByFields": null, - "limit": null - }); -}); - - -test('Parse COUNT Aggregate Query', () => { - const query = 'SELECT COUNT(*) FROM student'; - const parsed = parseQuery(query); - expect(parsed).toEqual({ - fields: ['COUNT(*)'], - table: 'student', - whereClauses: [], - groupByFields: null, - hasAggregateWithoutGroupBy: true, - "joinCondition": null, - "joinTable": null, - "joinType": null, - "orderByFields": null, - "limit": null - }); -}); - - -test('Parse SUM Aggregate Query', () => { - const query = 'SELECT SUM(age) FROM student'; - const parsed = parseQuery(query); - expect(parsed).toEqual({ - fields: ['SUM(age)'], - table: 'student', - whereClauses: [], - groupByFields: null, - hasAggregateWithoutGroupBy: true, - "joinCondition": null, - "joinTable": null, - "joinType": null, - "orderByFields": null, - "limit": null - }); -}); - -test('Parse AVG Aggregate Query', () => { - const query = 'SELECT AVG(age) FROM student'; - const parsed = parseQuery(query); - expect(parsed).toEqual({ - fields: ['AVG(age)'], - table: 'student', - whereClauses: [], - groupByFields: null, - hasAggregateWithoutGroupBy: true, - "joinCondition": null, - "joinTable": null, - "joinType": null, - "orderByFields": null, - "limit": null - }); -}); - -test('Parse MIN Aggregate Query', () => { - const query = 'SELECT MIN(age) FROM student'; - const parsed = parseQuery(query); - expect(parsed).toEqual({ - fields: ['MIN(age)'], - table: 'student', - whereClauses: [], - groupByFields: null, - hasAggregateWithoutGroupBy: true, - "joinCondition": null, - "joinTable": null, - "joinType": null, - "orderByFields": null, - "limit": null - }); -}); - -test('Parse MAX Aggregate Query', () => { - const query = 'SELECT MAX(age) FROM student'; - const parsed = parseQuery(query); - expect(parsed).toEqual({ - fields: ['MAX(age)'], - table: 'student', - whereClauses: [], - groupByFields: null, - hasAggregateWithoutGroupBy: true, - "joinCondition": null, - "joinTable": null, - "joinType": null, - "orderByFields": null, - "limit": null - }); -}); - -test('Parse basic GROUP BY query', () => { - const query = 'SELECT age, COUNT(*) FROM student GROUP BY age'; - const parsed = parseQuery(query); - expect(parsed).toEqual({ - fields: ['age', 'COUNT(*)'], - table: 'student', - whereClauses: [], - groupByFields: ['age'], - joinType: null, - joinTable: null, - joinCondition: null, - hasAggregateWithoutGroupBy: false, - orderByFields: null, - "limit": null - }); -}); - -test('Parse GROUP BY query with WHERE clause', () => { - const query = 'SELECT age, COUNT(*) FROM student WHERE age > 22 GROUP BY age'; - const parsed = parseQuery(query); - expect(parsed).toEqual({ - fields: ['age', 'COUNT(*)'], - table: 'student', - whereClauses: [{ field: 'age', operator: '>', value: '22' }], - groupByFields: ['age'], - joinType: null, - joinTable: null, - joinCondition: null, - hasAggregateWithoutGroupBy: false, - orderByFields: null, - "limit": null - }); -}); - -test('Parse GROUP BY query with multiple fields', () => { - const query = 'SELECT student_id, course, COUNT(*) FROM enrollment GROUP BY student_id, course'; - const parsed = parseQuery(query); - expect(parsed).toEqual({ - fields: ['student_id', 'course', 'COUNT(*)'], - table: 'enrollment', - whereClauses: [], - groupByFields: ['student_id', 'course'], - joinType: null, - joinTable: null, - joinCondition: null, - hasAggregateWithoutGroupBy: false, - orderByFields: null, - "limit": null - }); -}); - -test('Parse GROUP BY query with JOIN and WHERE clauses', () => { - const query = 'SELECT student.name, COUNT(*) FROM student INNER JOIN enrollment ON student.id = enrollment.student_id WHERE enrollment.course = "Mathematics" GROUP BY student.name'; - const parsed = parseQuery(query); - expect(parsed).toEqual({ - fields: ['student.name', 'COUNT(*)'], - table: 'student', - whereClauses: [{ field: 'enrollment.course', operator: '=', value: '"Mathematics"' }], - groupByFields: ['student.name'], - joinType: 'INNER', - joinTable: 'enrollment', - joinCondition: { - left: 'student.id', - right: 'enrollment.student_id' - }, - hasAggregateWithoutGroupBy: false, - orderByFields: null, - "limit": null, - }); -}); - -test('Execute SQL Query with ORDER BY', async () => { - const query = 'SELECT name FROM student ORDER BY name ASC'; - const result = await executeSELECTQuery(query); - - expect(result).toStrictEqual([ - { name: 'Alice' }, - { name: 'Bob' }, - { name: 'Jane' }, - { name: 'John' } - ]); -}); - -test('Execute SQL Query with ORDER BY and WHERE', async () => { - const query = 'SELECT name FROM student WHERE age > 24 ORDER BY name DESC'; - const result = await executeSELECTQuery(query); - - expect(result).toStrictEqual([ - { name: 'John' }, - { name: 'Jane' }, - ]); -}); -test('Execute SQL Query with ORDER BY and GROUP BY', async () => { - const query = 'SELECT COUNT(id) as count, age FROM student GROUP BY age ORDER BY age DESC'; - const result = await executeSELECTQuery(query); - - expect(result).toStrictEqual([ - { age: '30', 'COUNT(id) as count': 1 }, - { age: '25', 'COUNT(id) as count': 1 }, - { age: '24', 'COUNT(id) as count': 1 }, - { age: '22', 'COUNT(id) as count': 1 } - ]); -}); - -test('Execute SQL Query with standard LIMIT clause', async () => { - const query = 'SELECT id, name FROM student LIMIT 2'; - const result = await executeSELECTQuery(query); - expect(result.length).toEqual(2); -}); - -test('Execute SQL Query with LIMIT clause equal to total rows', async () => { - const query = 'SELECT id, name FROM student LIMIT 4'; - const result = await executeSELECTQuery(query); - expect(result.length).toEqual(4); -}); - -test('Execute SQL Query with LIMIT clause exceeding total rows', async () => { - const query = 'SELECT id, name FROM student LIMIT 10'; - const result = await executeSELECTQuery(query); - expect(result.length).toEqual(4); // Total rows in student.csv -}); - -test('Execute SQL Query with LIMIT 0', async () => { - const query = 'SELECT id, name FROM student LIMIT 0'; - const result = await executeSELECTQuery(query); - expect(result.length).toEqual(0); -}); - -test('Execute SQL Query with LIMIT and ORDER BY clause', async () => { - const query = 'SELECT id, name FROM student ORDER BY age DESC LIMIT 2'; - const result = await executeSELECTQuery(query); - expect(result.length).toEqual(2); - expect(result[0].name).toEqual('John'); - expect(result[1].name).toEqual('Jane'); -}); \ No newline at end of file diff --git a/tests/step-13/index.test.js b/tests/step-13/index.test.js index 0797faaba..52acc5bcc 100644 --- a/tests/step-13/index.test.js +++ b/tests/step-13/index.test.js @@ -1,726 +1,791 @@ -const readCSV = require('../../src/csvReader'); -const {parseQuery, parseJoinClause} = require('../../src/queryParser'); -const executeSELECTQuery = require('../../src/index'); - -test('Read CSV File', async () => { - const data = await readCSV('./student.csv'); - expect(data.length).toBeGreaterThan(0); - expect(data.length).toBe(4); - expect(data[0].name).toBe('John'); - expect(data[0].age).toBe('30'); //ignore the string type here, we will fix this later -}); - -test('Execute SQL Query', async () => { - const query = 'SELECT id, name FROM student'; - const result = await executeSELECTQuery(query); - expect(result.length).toBeGreaterThan(0); - expect(result[0]).toHaveProperty('id'); - expect(result[0]).toHaveProperty('name'); - expect(result[0]).not.toHaveProperty('age'); - expect(result[0]).toEqual({ id: '1', name: 'John' }); -}); - -test('Execute SQL Query with WHERE Clause', async () => { - const query = 'SELECT id, name FROM student WHERE age = 25'; - const result = await executeSELECTQuery(query); - expect(result.length).toBe(1); - expect(result[0]).toHaveProperty('id'); - expect(result[0]).toHaveProperty('name'); - expect(result[0].id).toBe('2'); -}); - -test('Execute SQL Query with Complex WHERE Clause', async () => { - const query = 'SELECT id, name FROM student WHERE age = 30 AND name = John'; - const result = await executeSELECTQuery(query); - expect(result.length).toBe(1); - expect(result[0]).toEqual({ id: '1', name: 'John' }); -}); - -test('Execute SQL Query with Greater Than', async () => { - const queryWithGT = 'SELECT id FROM student WHERE age > 22'; - const result = await executeSELECTQuery(queryWithGT); - expect(result.length).toEqual(3); - expect(result[0]).toHaveProperty('id'); -}); - -test('Execute SQL Query with Not Equal to', async () => { - const queryWithGT = 'SELECT name FROM student WHERE age != 25'; - const result = await executeSELECTQuery(queryWithGT); - expect(result.length).toEqual(3); - expect(result[0]).toHaveProperty('name'); -}); - -test('Execute SQL Query with INNER JOIN', async () => { - const query = 'SELECT student.name, enrollment.course FROM student INNER JOIN enrollment ON student.id=enrollment.student_id'; - const result = await executeSELECTQuery(query); - /* - result = [ - { 'student.name': 'John', 'enrollment.course': 'Mathematics' }, - { 'student.name': 'John', 'enrollment.course': 'Physics' }, - { 'student.name': 'Jane', 'enrollment.course': 'Chemistry' }, - { 'student.name': 'Bob', 'enrollment.course': 'Mathematics' } - ] - */ - expect(result.length).toEqual(4); - // toHaveProperty is not working here due to dot in the property name - expect(result[0]).toEqual(expect.objectContaining({ - "enrollment.course": "Mathematics", - "student.name": "John" - })); +const { readCSV } = require("../../src/csvReader"); +const { parseSelectQuery, parseJoinClause } = require("../../src/queryParser"); +const { executeSELECTQuery } = require("../../src/queryExecutor"); + +test("Read CSV File", async () => { + const data = await readCSV("./student.csv"); + expect(data.length).toBeGreaterThan(0); + expect(data.length).toBe(4); + expect(data[0].name).toBe("John"); + expect(data[0].age).toBe("30"); +}); + +test("Execute SQL Query", async () => { + const query = "SELECT id, name FROM student"; + const result = await executeSELECTQuery(query); + expect(result.length).toBeGreaterThan(0); + expect(result[0]).toHaveProperty("id"); + expect(result[0]).toHaveProperty("name"); + expect(result[0]).not.toHaveProperty("age"); + expect(result[0]).toEqual({ id: "1", name: "John" }); +}); + +test("Execute SQL Query with WHERE Clause", async () => { + const query = "SELECT id, name FROM student WHERE age = 25"; + const result = await executeSELECTQuery(query); + expect(result.length).toBe(1); + expect(result[0]).toHaveProperty("id"); + expect(result[0]).toHaveProperty("name"); + expect(result[0].id).toBe("2"); +}); + +test("Execute SQL Query with Complex WHERE Clause", async () => { + const query = "SELECT id, name FROM student WHERE age = 30 AND name = John"; + const result = await executeSELECTQuery(query); + expect(result.length).toBe(1); + expect(result[0]).toEqual({ id: "1", name: "John" }); +}); + +test("Execute SQL Query with Greater Than", async () => { + const queryWithGT = "SELECT id FROM student WHERE age > 22"; + const result = await executeSELECTQuery(queryWithGT); + expect(result.length).toEqual(3); + expect(result[0]).toHaveProperty("id"); +}); + +test("Execute SQL Query with Not Equal to", async () => { + const queryWithGT = "SELECT name FROM student WHERE age != 25"; + const result = await executeSELECTQuery(queryWithGT); + expect(result.length).toEqual(3); + expect(result[0]).toHaveProperty("name"); +}); + +test("Execute SQL Query with INNER JOIN", async () => { + const query = + "SELECT student.name, enrollment.course FROM student INNER JOIN enrollment ON student.id=enrollment.student_id"; + const result = await executeSELECTQuery(query); + + expect(result.length).toEqual(4); + expect(result[0]).toEqual( + expect.objectContaining({ + "enrollment.course": "Mathematics", + "student.name": "John", + }) + ); }); -test('Execute SQL Query with INNER JOIN and a WHERE Clause', async () => { - const query = 'SELECT student.name, enrollment.course, student.age FROM student INNER JOIN enrollment ON student.id = enrollment.student_id WHERE student.age > 25'; - const result = await executeSELECTQuery(query); - /* - result = [ +test("Execute SQL Query with INNER JOIN and a WHERE Clause", async () => { + const query = + "SELECT student.name, enrollment.course, student.age FROM student INNER JOIN enrollment ON student.id = enrollment.student_id WHERE student.age > 25"; + const result = await executeSELECTQuery(query); + expect(result.length).toEqual(2); + + expect(result[0]).toEqual( + expect.objectContaining({ + "enrollment.course": "Mathematics", + "student.name": "John", + }) + ); +}); + +test("Execute SQL Query with LEFT JOIN", async () => { + const query = + "SELECT student.name, enrollment.course FROM student LEFT JOIN enrollment ON student.id=enrollment.student_id"; + const result = await executeSELECTQuery(query); + expect(result).toEqual( + expect.arrayContaining([ + expect.objectContaining({ + "student.name": "Alice", + "enrollment.course": null, + }), + expect.objectContaining({ + "student.name": "John", + "enrollment.course": "Mathematics", + }), + ]) + ); + expect(result.length).toEqual(5); +}); + +test("Execute SQL Query with RIGHT JOIN", async () => { + const query = + "SELECT student.name, enrollment.course FROM student RIGHT JOIN enrollment ON student.id=enrollment.student_id"; + const result = await executeSELECTQuery(query); + expect(result).toEqual( + expect.arrayContaining([ + expect.objectContaining({ + "student.name": null, + "enrollment.course": "Biology", + }), + expect.objectContaining({ + "student.name": "John", + "enrollment.course": "Mathematics", + }), + ]) + ); + expect(result.length).toEqual(5); +}); + +test("Execute SQL Query with LEFT JOIN with a WHERE clause filtering the main table", async () => { + const query = + "SELECT student.name, enrollment.course FROM student LEFT JOIN enrollment ON student.id=enrollment.student_id WHERE student.age > 22"; + const result = await executeSELECTQuery(query); + expect(result).toEqual( + expect.arrayContaining([ + expect.objectContaining({ + "enrollment.course": "Mathematics", + "student.name": "John", + }), + expect.objectContaining({ + "enrollment.course": "Physics", + "student.name": "John", + }), + ]) + ); + expect(result.length).toEqual(4); +}); + +test("Execute SQL Query with LEFT JOIN with a WHERE clause filtering the join table", async () => { + const query = `SELECT student.name, enrollment.course FROM student LEFT JOIN enrollment ON student.id=enrollment.student_id WHERE enrollment.course = 'Physics'`; + const result = await executeSELECTQuery(query); + expect(result).toEqual( + expect.arrayContaining([ + expect.objectContaining({ + "student.name": "John", + "enrollment.course": "Physics", + }), + ]) + ); + expect(result.length).toEqual(1); +}); + +test("Execute SQL Query with RIGHT JOIN with a WHERE clause filtering the main table", async () => { + const query = + "SELECT student.name, enrollment.course FROM student RIGHT JOIN enrollment ON student.id=enrollment.student_id WHERE student.age < 25"; + const result = await executeSELECTQuery(query); + expect(result).toEqual( + expect.arrayContaining([ + expect.objectContaining({ + "enrollment.course": "Mathematics", + "student.name": "Bob", + }), + expect.objectContaining({ + "enrollment.course": "Biology", + "student.name": null, + }), + ]) + ); + expect(result.length).toEqual(2); +}); + +test("Execute SQL Query with RIGHT JOIN with a WHERE clause filtering the join table", async () => { + const query = `SELECT student.name, enrollment.course FROM student RIGHT JOIN enrollment ON student.id=enrollment.student_id WHERE enrollment.course = 'Chemistry'`; + const result = await executeSELECTQuery(query); + expect(result).toEqual( + expect.arrayContaining([ + expect.objectContaining({ + "enrollment.course": "Chemistry", + "student.name": "Jane", + }), + ]) + ); + expect(result.length).toEqual(1); +}); + +test("Execute SQL Query with RIGHT JOIN with a multiple WHERE clauses filtering the join table and main table", async () => { + const query = `SELECT student.name, enrollment.course FROM student RIGHT JOIN enrollment ON student.id=enrollment.student_id WHERE enrollment.course = 'Chemistry' AND student.age = 26`; + const result = await executeSELECTQuery(query); + expect(result).toEqual([]); +}); + +test("Execute COUNT Aggregate Query", async () => { + const query = "SELECT COUNT(*) FROM student"; + const result = await executeSELECTQuery(query); + expect(result).toEqual([{ "COUNT(*)": 4 }]); +}); + +test("Execute SUM Aggregate Query", async () => { + const query = "SELECT SUM(age) FROM student"; + const result = await executeSELECTQuery(query); + expect(result).toEqual([{ "SUM(age)": 101 }]); +}); + +test("Execute AVG Aggregate Query", async () => { + const query = "SELECT AVG(age) FROM student"; + const result = await executeSELECTQuery(query); + expect(result).toEqual([{ "AVG(age)": 25.25 }]); +}); + +test("Execute MIN Aggregate Query", async () => { + const query = "SELECT MIN(age) FROM student"; + const result = await executeSELECTQuery(query); + expect(result).toEqual([{ "MIN(age)": 22 }]); +}); + +test("Execute MAX Aggregate Query", async () => { + const query = "SELECT MAX(age) FROM student"; + const result = await executeSELECTQuery(query); + expect(result).toEqual([{ "MAX(age)": 30 }]); +}); + +test("Count students per age", async () => { + const query = "SELECT age, COUNT(*) FROM student GROUP BY age"; + const result = await executeSELECTQuery(query); + expect(result).toEqual([ + { age: "22", "COUNT(*)": 1 }, + { age: "24", "COUNT(*)": 1 }, + { age: "25", "COUNT(*)": 1 }, + { age: "30", "COUNT(*)": 1 }, + ]); +}); + +test("Count enrollments per course", async () => { + const query = "SELECT course, COUNT(*) FROM enrollment GROUP BY course"; + const result = await executeSELECTQuery(query); + expect(result).toEqual([ + { course: "Mathematics", "COUNT(*)": 2 }, + { course: "Physics", "COUNT(*)": 1 }, + { course: "Chemistry", "COUNT(*)": 1 }, + { course: "Biology", "COUNT(*)": 1 }, + ]); +}); + +test("Count courses per student", async () => { + const query = + "SELECT student_id, COUNT(*) FROM enrollment GROUP BY student_id"; + const result = await executeSELECTQuery(query); + expect(result).toEqual([ + { student_id: "1", "COUNT(*)": 2 }, + { student_id: "2", "COUNT(*)": 1 }, + { student_id: "3", "COUNT(*)": 1 }, + { student_id: "5", "COUNT(*)": 1 }, + ]); +}); + +test("Count students within a specific age range", async () => { + const query = "SELECT age, COUNT(*) FROM student WHERE age > 22 GROUP BY age"; + const result = await executeSELECTQuery(query); + expect(result).toEqual([ + { age: "24", "COUNT(*)": 1 }, + { age: "25", "COUNT(*)": 1 }, + { age: "30", "COUNT(*)": 1 }, + ]); +}); + +test("Count enrollments for a specific course", async () => { + const query = + 'SELECT course, COUNT(*) FROM enrollment WHERE course = "Mathematics" GROUP BY course'; + const result = await executeSELECTQuery(query); + expect(result).toEqual([{ course: "Mathematics", "COUNT(*)": 2 }]); +}); + +test("Count courses for a specific student", async () => { + const query = + "SELECT student_id, COUNT(*) FROM enrollment WHERE student_id = 1 GROUP BY student_id"; + const result = await executeSELECTQuery(query); + expect(result).toEqual([{ student_id: "1", "COUNT(*)": 2 }]); +}); + +test("Average age of students above a certain age", async () => { + const query = "SELECT AVG(age) FROM student WHERE age > 22"; + const result = await executeSELECTQuery(query); + const expectedAverage = (25 + 30 + 24) / 3; // Average age of students older than 22 + expect(result).toEqual([{ "AVG(age)": expectedAverage }]); +}); + +test("Parse SQL Query", () => { + const query = "SELECT id, name FROM student"; + const parsed = parseSelectQuery(query); + expect(parsed).toEqual({ + fields: ["id", "name"], + table: "student", + whereClauses: [], + joinCondition: null, + joinTable: null, + joinType: null, + groupByFields: null, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse SQL Query with WHERE Clause", () => { + const query = "SELECT id, name FROM student WHERE age = 25"; + const parsed = parseSelectQuery(query); + expect(parsed).toEqual({ + fields: ["id", "name"], + table: "student", + whereClauses: [ { - 'student.name': 'John', - 'enrollment.course': 'Mathematics', - 'student.age': '30' + field: "age", + operator: "=", + value: "25", }, + ], + joinCondition: null, + joinTable: null, + joinType: null, + groupByFields: null, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse SQL Query with Multiple WHERE Clauses", () => { + const query = "SELECT id, name FROM student WHERE age = 30 AND name = John"; + const parsed = parseSelectQuery(query); + expect(parsed).toEqual({ + fields: ["id", "name"], + table: "student", + whereClauses: [ { - 'student.name': 'John', - 'enrollment.course': 'Physics', - 'student.age': '30' - } - ] - */ - expect(result.length).toEqual(2); - // toHaveProperty is not working here due to dot in the property name - expect(result[0]).toEqual(expect.objectContaining({ - "enrollment.course": "Mathematics", - "student.name": "John" - })); -}); - -test('Execute SQL Query with LEFT JOIN', async () => { - const query = 'SELECT student.name, enrollment.course FROM student LEFT JOIN enrollment ON student.id=enrollment.student_id'; - const result = await executeSELECTQuery(query); - expect(result).toEqual(expect.arrayContaining([ - expect.objectContaining({ "student.name": "Alice", "enrollment.course": null }), - expect.objectContaining({ "student.name": "John", "enrollment.course": "Mathematics" }) - ])); - expect(result.length).toEqual(5); // 4 students, but John appears twice -}); - -test('Execute SQL Query with RIGHT JOIN', async () => { - const query = 'SELECT student.name, enrollment.course FROM student RIGHT JOIN enrollment ON student.id=enrollment.student_id'; - const result = await executeSELECTQuery(query); - expect(result).toEqual(expect.arrayContaining([ - expect.objectContaining({ "student.name": null, "enrollment.course": "Biology" }), - expect.objectContaining({ "student.name": "John", "enrollment.course": "Mathematics" }) - ])); - expect(result.length).toEqual(5); // 4 courses, but Mathematics appears twice -}); - -test('Execute SQL Query with LEFT JOIN with a WHERE clause filtering the main table', async () => { - const query = 'SELECT student.name, enrollment.course FROM student LEFT JOIN enrollment ON student.id=enrollment.student_id WHERE student.age > 22'; - const result = await executeSELECTQuery(query); - expect(result).toEqual(expect.arrayContaining([ - expect.objectContaining({ "enrollment.course": "Mathematics", "student.name": "John" }), - expect.objectContaining({ "enrollment.course": "Physics", "student.name": "John" }) - ])); - expect(result.length).toEqual(4); -}); - -test('Execute SQL Query with LEFT JOIN with a WHERE clause filtering the join table', async () => { - const query = `SELECT student.name, enrollment.course FROM student LEFT JOIN enrollment ON student.id=enrollment.student_id WHERE enrollment.course = 'Physics'`; - const result = await executeSELECTQuery(query); - expect(result).toEqual(expect.arrayContaining([ - expect.objectContaining({ "student.name": "John", "enrollment.course": "Physics" }) - ])); - expect(result.length).toEqual(1); -}); - -test('Execute SQL Query with RIGHT JOIN with a WHERE clause filtering the main table', async () => { - const query = 'SELECT student.name, enrollment.course FROM student RIGHT JOIN enrollment ON student.id=enrollment.student_id WHERE student.age < 25'; - const result = await executeSELECTQuery(query); - expect(result).toEqual(expect.arrayContaining([ - expect.objectContaining({ "enrollment.course": "Mathematics", "student.name": "Bob" }), - expect.objectContaining({ "enrollment.course": "Biology", "student.name": null }) - ])); - expect(result.length).toEqual(2); -}); - -test('Execute SQL Query with RIGHT JOIN with a WHERE clause filtering the join table', async () => { - const query = `SELECT student.name, enrollment.course FROM student RIGHT JOIN enrollment ON student.id=enrollment.student_id WHERE enrollment.course = 'Chemistry'`; - const result = await executeSELECTQuery(query); - expect(result).toEqual(expect.arrayContaining([ - expect.objectContaining({ "enrollment.course": "Chemistry", "student.name": "Jane" }), - ])); - expect(result.length).toEqual(1); -}); - -test('Execute SQL Query with RIGHT JOIN with a multiple WHERE clauses filtering the join table and main table', async () => { - const query = `SELECT student.name, enrollment.course FROM student RIGHT JOIN enrollment ON student.id=enrollment.student_id WHERE enrollment.course = 'Chemistry' AND student.age = 26`; - const result = await executeSELECTQuery(query); - expect(result).toEqual([]); -}); - -test('Execute COUNT Aggregate Query', async () => { - const query = 'SELECT COUNT(*) FROM student'; - const result = await executeSELECTQuery(query); - expect(result).toEqual([{ 'COUNT(*)': 4 }]); -}); - -test('Execute SUM Aggregate Query', async () => { - const query = 'SELECT SUM(age) FROM student'; - const result = await executeSELECTQuery(query); - expect(result).toEqual([{ 'SUM(age)': 101 }]); -}); - -test('Execute AVG Aggregate Query', async () => { - const query = 'SELECT AVG(age) FROM student'; - const result = await executeSELECTQuery(query); - // Assuming AVG returns a single decimal point value - expect(result).toEqual([{ 'AVG(age)': 25.25 }]); -}); - -test('Execute MIN Aggregate Query', async () => { - const query = 'SELECT MIN(age) FROM student'; - const result = await executeSELECTQuery(query); - expect(result).toEqual([{ 'MIN(age)': 22 }]); -}); - -test('Execute MAX Aggregate Query', async () => { - const query = 'SELECT MAX(age) FROM student'; - const result = await executeSELECTQuery(query); - expect(result).toEqual([{ 'MAX(age)': 30 }]); -}); - -test('Count students per age', async () => { - const query = 'SELECT age, COUNT(*) FROM student GROUP BY age'; - const result = await executeSELECTQuery(query); - expect(result).toEqual([ - { age: '22', 'COUNT(*)': 1 }, - { age: '24', 'COUNT(*)': 1 }, - { age: '25', 'COUNT(*)': 1 }, - { age: '30', 'COUNT(*)': 1 } - ]); -}); - -test('Count enrollments per course', async () => { - const query = 'SELECT course, COUNT(*) FROM enrollment GROUP BY course'; - const result = await executeSELECTQuery(query); - expect(result).toEqual([ - { course: 'Mathematics', 'COUNT(*)': 2 }, - { course: 'Physics', 'COUNT(*)': 1 }, - { course: 'Chemistry', 'COUNT(*)': 1 }, - { course: 'Biology', 'COUNT(*)': 1 } - ]); -}); - - -test('Count courses per student', async () => { - const query = 'SELECT student_id, COUNT(*) FROM enrollment GROUP BY student_id'; - const result = await executeSELECTQuery(query); - expect(result).toEqual([ - { student_id: '1', 'COUNT(*)': 2 }, - { student_id: '2', 'COUNT(*)': 1 }, - { student_id: '3', 'COUNT(*)': 1 }, - { student_id: '5', 'COUNT(*)': 1 } - ]); -}); - -test('Count students within a specific age range', async () => { - const query = 'SELECT age, COUNT(*) FROM student WHERE age > 22 GROUP BY age'; - const result = await executeSELECTQuery(query); - expect(result).toEqual([ - { age: '24', 'COUNT(*)': 1 }, - { age: '25', 'COUNT(*)': 1 }, - { age: '30', 'COUNT(*)': 1 } - ]); -}); - -test('Count enrollments for a specific course', async () => { - const query = 'SELECT course, COUNT(*) FROM enrollment WHERE course = "Mathematics" GROUP BY course'; - const result = await executeSELECTQuery(query); - expect(result).toEqual([ - { course: 'Mathematics', 'COUNT(*)': 2 } - ]); -}); - -test('Count courses for a specific student', async () => { - const query = 'SELECT student_id, COUNT(*) FROM enrollment WHERE student_id = 1 GROUP BY student_id'; - const result = await executeSELECTQuery(query); - expect(result).toEqual([ - { student_id: '1', 'COUNT(*)': 2 } - ]); -}); - -test('Average age of students above a certain age', async () => { - const query = 'SELECT AVG(age) FROM student WHERE age > 22'; - const result = await executeSELECTQuery(query); - const expectedAverage = (25 + 30 + 24) / 3; // Average age of students older than 22 - expect(result).toEqual([{ 'AVG(age)': expectedAverage }]); -}); - -test('Parse SQL Query', () => { - const query = 'SELECT id, name FROM student'; - const parsed = parseQuery(query); - expect(parsed).toEqual({ - fields: ['id', 'name'], - table: 'student', - whereClauses: [], - joinCondition: null, - joinTable: null, - joinType: null, - groupByFields: null, - hasAggregateWithoutGroupBy: false, - "orderByFields": null, - "limit": null - }); -}); - -test('Parse SQL Query with WHERE Clause', () => { - const query = 'SELECT id, name FROM student WHERE age = 25'; - const parsed = parseQuery(query); - expect(parsed).toEqual({ - fields: ['id', 'name'], - table: 'student', - whereClauses: [{ - "field": "age", - "operator": "=", - "value": "25", - }], - joinCondition: null, - joinTable: null, - joinType: null, - groupByFields: null, - hasAggregateWithoutGroupBy: false, - "orderByFields": null, - "limit": null - }); -}); - -test('Parse SQL Query with Multiple WHERE Clauses', () => { - const query = 'SELECT id, name FROM student WHERE age = 30 AND name = John'; - const parsed = parseQuery(query); - expect(parsed).toEqual({ - fields: ['id', 'name'], - table: 'student', - whereClauses: [{ - "field": "age", - "operator": "=", - "value": "30", - }, { - "field": "name", - "operator": "=", - "value": "John", - }], - joinCondition: null, - joinTable: null, - joinType: null, - groupByFields: null, - hasAggregateWithoutGroupBy: false, - "orderByFields": null, - "limit": null - }); -}); - -test('Parse SQL Query with INNER JOIN', async () => { - const query = 'SELECT student.name, enrollment.course FROM student INNER JOIN enrollment ON student.id=enrollment.student_id'; - const result = await parseQuery(query); - expect(result).toEqual({ - fields: ['student.name', 'enrollment.course'], - table: 'student', - whereClauses: [], - joinTable: 'enrollment', - joinType: "INNER", - joinCondition: { left: 'student.id', right: 'enrollment.student_id' }, - groupByFields: null, - hasAggregateWithoutGroupBy: false, - "orderByFields": null, - "limit": null - }) -}); - -test('Parse SQL Query with INNER JOIN and WHERE Clause', async () => { - const query = 'SELECT student.name, enrollment.course FROM student INNER JOIN enrollment ON student.id = enrollment.student_id WHERE student.age > 20'; - const result = await parseQuery(query); - expect(result).toEqual({ - fields: ['student.name', 'enrollment.course'], - table: 'student', - whereClauses: [{ field: 'student.age', operator: '>', value: '20' }], - joinTable: 'enrollment', - joinType: "INNER", - joinCondition: { left: 'student.id', right: 'enrollment.student_id' }, - groupByFields: null, - hasAggregateWithoutGroupBy: false, - "orderByFields": null, - "limit": null - }) + field: "age", + operator: "=", + value: "30", + }, + { + field: "name", + operator: "=", + value: "John", + }, + ], + joinCondition: null, + joinTable: null, + joinType: null, + groupByFields: null, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse SQL Query with INNER JOIN", async () => { + const query = + "SELECT student.name, enrollment.course FROM student INNER JOIN enrollment ON student.id=enrollment.student_id"; + const result = await parseSelectQuery(query); + expect(result).toEqual({ + fields: ["student.name", "enrollment.course"], + table: "student", + whereClauses: [], + joinTable: "enrollment", + joinType: "INNER", + joinCondition: { left: "student.id", right: "enrollment.student_id" }, + groupByFields: null, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse SQL Query with INNER JOIN and WHERE Clause", async () => { + const query = + "SELECT student.name, enrollment.course FROM student INNER JOIN enrollment ON student.id = enrollment.student_id WHERE student.age > 20"; + const result = await parseSelectQuery(query); + expect(result).toEqual({ + fields: ["student.name", "enrollment.course"], + table: "student", + whereClauses: [{ field: "student.age", operator: ">", value: "20" }], + joinTable: "enrollment", + joinType: "INNER", + joinCondition: { left: "student.id", right: "enrollment.student_id" }, + groupByFields: null, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse INNER JOIN clause", () => { + const query = + "SELECT * FROM table1 INNER JOIN table2 ON table1.id = table2.ref_id"; + const result = parseJoinClause(query); + expect(result).toEqual({ + joinType: "INNER", + joinTable: "table2", + joinCondition: { left: "table1.id", right: "table2.ref_id" }, + }); +}); + +test("Parse LEFT JOIN clause", () => { + const query = + "SELECT * FROM table1 LEFT JOIN table2 ON table1.id = table2.ref_id"; + const result = parseJoinClause(query); + expect(result).toEqual({ + joinType: "LEFT", + joinTable: "table2", + joinCondition: { left: "table1.id", right: "table2.ref_id" }, + }); +}); + +test("Parse RIGHT JOIN clause", () => { + const query = + "SELECT * FROM table1 RIGHT JOIN table2 ON table1.id = table2.ref_id"; + const result = parseJoinClause(query); + expect(result).toEqual({ + joinType: "RIGHT", + joinTable: "table2", + joinCondition: { left: "table1.id", right: "table2.ref_id" }, + }); +}); + +test("Returns null for queries without JOIN", () => { + const query = "SELECT * FROM table1"; + const result = parseJoinClause(query); + expect(result).toEqual({ + joinType: null, + joinTable: null, + joinCondition: null, + }); +}); + +test("Parse LEFT Join Query Completely", () => { + const query = + "SELECT student.name, enrollment.course FROM student LEFT JOIN enrollment ON student.id=enrollment.student_id"; + const result = parseSelectQuery(query); + expect(result).toEqual({ + fields: ["student.name", "enrollment.course"], + table: "student", + whereClauses: [], + joinType: "LEFT", + joinTable: "enrollment", + joinCondition: { left: "student.id", right: "enrollment.student_id" }, + groupByFields: null, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse LEFT Join Query Completely", () => { + const query = + "SELECT student.name, enrollment.course FROM student RIGHT JOIN enrollment ON student.id=enrollment.student_id"; + const result = parseSelectQuery(query); + expect(result).toEqual({ + fields: ["student.name", "enrollment.course"], + table: "student", + whereClauses: [], + joinType: "RIGHT", + joinTable: "enrollment", + joinCondition: { left: "student.id", right: "enrollment.student_id" }, + groupByFields: null, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse SQL Query with LEFT JOIN with a WHERE clause filtering the main table", async () => { + const query = + "SELECT student.name, enrollment.course FROM student LEFT JOIN enrollment ON student.id=enrollment.student_id WHERE student.age > 22"; + const result = await parseSelectQuery(query); + expect(result).toEqual({ + fields: ["student.name", "enrollment.course"], + joinCondition: { left: "student.id", right: "enrollment.student_id" }, + joinTable: "enrollment", + joinType: "LEFT", + table: "student", + whereClauses: [{ field: "student.age", operator: ">", value: "22" }], + groupByFields: null, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse SQL Query with LEFT JOIN with a WHERE clause filtering the join table", async () => { + const query = `SELECT student.name, enrollment.course FROM student LEFT JOIN enrollment ON student.id=enrollment.student_id WHERE enrollment.course = 'Physics'`; + const result = await parseSelectQuery(query); + expect(result).toEqual({ + fields: ["student.name", "enrollment.course"], + joinCondition: { left: "student.id", right: "enrollment.student_id" }, + joinTable: "enrollment", + joinType: "LEFT", + table: "student", + whereClauses: [ + { field: "enrollment.course", operator: "=", value: "'Physics'" }, + ], + groupByFields: null, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse SQL Query with RIGHT JOIN with a WHERE clause filtering the main table", async () => { + const query = + "SELECT student.name, enrollment.course FROM student RIGHT JOIN enrollment ON student.id=enrollment.student_id WHERE student.age < 25"; + const result = await parseSelectQuery(query); + expect(result).toEqual({ + fields: ["student.name", "enrollment.course"], + joinCondition: { left: "student.id", right: "enrollment.student_id" }, + joinTable: "enrollment", + joinType: "RIGHT", + table: "student", + whereClauses: [{ field: "student.age", operator: "<", value: "25" }], + groupByFields: null, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse SQL Query with RIGHT JOIN with a WHERE clause filtering the join table", async () => { + const query = `SELECT student.name, enrollment.course FROM student RIGHT JOIN enrollment ON student.id=enrollment.student_id WHERE enrollment.course = 'Chemistry'`; + const result = await parseSelectQuery(query); + expect(result).toEqual({ + fields: ["student.name", "enrollment.course"], + joinCondition: { left: "student.id", right: "enrollment.student_id" }, + joinTable: "enrollment", + joinType: "RIGHT", + table: "student", + whereClauses: [ + { field: "enrollment.course", operator: "=", value: "'Chemistry'" }, + ], + groupByFields: null, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse COUNT Aggregate Query", () => { + const query = "SELECT COUNT(*) FROM student"; + const parsed = parseSelectQuery(query); + expect(parsed).toEqual({ + fields: ["COUNT(*)"], + table: "student", + whereClauses: [], + groupByFields: null, + hasAggregateWithoutGroupBy: true, + joinCondition: null, + joinTable: null, + joinType: null, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse SUM Aggregate Query", () => { + const query = "SELECT SUM(age) FROM student"; + const parsed = parseSelectQuery(query); + expect(parsed).toEqual({ + fields: ["SUM(age)"], + table: "student", + whereClauses: [], + groupByFields: null, + hasAggregateWithoutGroupBy: true, + joinCondition: null, + joinTable: null, + joinType: null, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse AVG Aggregate Query", () => { + const query = "SELECT AVG(age) FROM student"; + const parsed = parseSelectQuery(query); + expect(parsed).toEqual({ + fields: ["AVG(age)"], + table: "student", + whereClauses: [], + groupByFields: null, + hasAggregateWithoutGroupBy: true, + joinCondition: null, + joinTable: null, + joinType: null, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse MIN Aggregate Query", () => { + const query = "SELECT MIN(age) FROM student"; + const parsed = parseSelectQuery(query); + expect(parsed).toEqual({ + fields: ["MIN(age)"], + table: "student", + whereClauses: [], + groupByFields: null, + hasAggregateWithoutGroupBy: true, + joinCondition: null, + joinTable: null, + joinType: null, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse MAX Aggregate Query", () => { + const query = "SELECT MAX(age) FROM student"; + const parsed = parseSelectQuery(query); + expect(parsed).toEqual({ + fields: ["MAX(age)"], + table: "student", + whereClauses: [], + groupByFields: null, + hasAggregateWithoutGroupBy: true, + joinCondition: null, + joinTable: null, + joinType: null, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse basic GROUP BY query", () => { + const query = "SELECT age, COUNT(*) FROM student GROUP BY age"; + const parsed = parseSelectQuery(query); + expect(parsed).toEqual({ + fields: ["age", "COUNT(*)"], + table: "student", + whereClauses: [], + groupByFields: ["age"], + joinType: null, + joinTable: null, + joinCondition: null, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse GROUP BY query with WHERE clause", () => { + const query = "SELECT age, COUNT(*) FROM student WHERE age > 22 GROUP BY age"; + const parsed = parseSelectQuery(query); + expect(parsed).toEqual({ + fields: ["age", "COUNT(*)"], + table: "student", + whereClauses: [{ field: "age", operator: ">", value: "22" }], + groupByFields: ["age"], + joinType: null, + joinTable: null, + joinCondition: null, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse GROUP BY query with multiple fields", () => { + const query = + "SELECT student_id, course, COUNT(*) FROM enrollment GROUP BY student_id, course"; + const parsed = parseSelectQuery(query); + expect(parsed).toEqual({ + fields: ["student_id", "course", "COUNT(*)"], + table: "enrollment", + whereClauses: [], + groupByFields: ["student_id", "course"], + joinType: null, + joinTable: null, + joinCondition: null, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse GROUP BY query with JOIN and WHERE clauses", () => { + const query = + 'SELECT student.name, COUNT(*) FROM student INNER JOIN enrollment ON student.id = enrollment.student_id WHERE enrollment.course = "Mathematics" GROUP BY student.name'; + const parsed = parseSelectQuery(query); + expect(parsed).toEqual({ + fields: ["student.name", "COUNT(*)"], + table: "student", + whereClauses: [ + { field: "enrollment.course", operator: "=", value: '"Mathematics"' }, + ], + groupByFields: ["student.name"], + joinType: "INNER", + joinTable: "enrollment", + joinCondition: { + left: "student.id", + right: "enrollment.student_id", + }, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Execute SQL Query with ORDER BY", async () => { + const query = "SELECT name FROM student ORDER BY name ASC"; + const result = await executeSELECTQuery(query); + + expect(result).toStrictEqual([ + { name: "Alice" }, + { name: "Bob" }, + { name: "Jane" }, + { name: "John" }, + ]); +}); + +test("Execute SQL Query with ORDER BY and WHERE", async () => { + const query = "SELECT name FROM student WHERE age > 24 ORDER BY name DESC"; + const result = await executeSELECTQuery(query); + + expect(result).toStrictEqual([{ name: "John" }, { name: "Jane" }]); +}); +test("Execute SQL Query with ORDER BY and GROUP BY", async () => { + const query = + "SELECT COUNT(id) as count, age FROM student GROUP BY age ORDER BY age DESC"; + const result = await executeSELECTQuery(query); + + expect(result).toStrictEqual([ + { age: "30", "COUNT(id) as count": 1 }, + { age: "25", "COUNT(id) as count": 1 }, + { age: "24", "COUNT(id) as count": 1 }, + { age: "22", "COUNT(id) as count": 1 }, + ]); +}); + +test("Execute SQL Query with standard LIMIT clause", async () => { + const query = "SELECT id, name FROM student LIMIT 2"; + const result = await executeSELECTQuery(query); + expect(result.length).toEqual(2); +}); + +test("Execute SQL Query with LIMIT clause equal to total rows", async () => { + const query = "SELECT id, name FROM student LIMIT 4"; + const result = await executeSELECTQuery(query); + expect(result.length).toEqual(4); +}); + +test("Execute SQL Query with LIMIT clause exceeding total rows", async () => { + const query = "SELECT id, name FROM student LIMIT 10"; + const result = await executeSELECTQuery(query); + expect(result.length).toEqual(4); // Total rows in student.csv +}); + +test("Execute SQL Query with LIMIT 0", async () => { + const query = "SELECT id, name FROM student LIMIT 0"; + const result = await executeSELECTQuery(query); + expect(result.length).toEqual(0); +}); + +test("Execute SQL Query with LIMIT and ORDER BY clause", async () => { + const query = "SELECT id, name FROM student ORDER BY age DESC LIMIT 2"; + const result = await executeSELECTQuery(query); + expect(result.length).toEqual(2); + expect(result[0].name).toEqual("John"); + expect(result[1].name).toEqual("Jane"); +}); + +test("Error Handling with Malformed Query", async () => { + const query = "SELECT FROM table"; // intentionally malformed + await expect(executeSELECTQuery(query)).rejects.toThrow( + "Error executing query: Query parsing error: Invalid SELECT format" + ); }); - -test('Parse INNER JOIN clause', () => { - const query = 'SELECT * FROM table1 INNER JOIN table2 ON table1.id = table2.ref_id'; - const result = parseJoinClause(query); - expect(result).toEqual({ - joinType: 'INNER', - joinTable: 'table2', - joinCondition: { left: 'table1.id', right: 'table2.ref_id' }, - }); -}); - -test('Parse LEFT JOIN clause', () => { - const query = 'SELECT * FROM table1 LEFT JOIN table2 ON table1.id = table2.ref_id'; - const result = parseJoinClause(query); - expect(result).toEqual({ - joinType: 'LEFT', - joinTable: 'table2', - joinCondition: { left: 'table1.id', right: 'table2.ref_id' } - }); -}); - -test('Parse RIGHT JOIN clause', () => { - const query = 'SELECT * FROM table1 RIGHT JOIN table2 ON table1.id = table2.ref_id'; - const result = parseJoinClause(query); - expect(result).toEqual({ - joinType: 'RIGHT', - joinTable: 'table2', - joinCondition: { left: 'table1.id', right: 'table2.ref_id' } - }); -}); - -test('Returns null for queries without JOIN', () => { - const query = 'SELECT * FROM table1'; - const result = parseJoinClause(query); - expect(result).toEqual( - { - joinType: null, - joinTable: null, - joinCondition: null - } - ); -}); - -test('Parse LEFT Join Query Completely', () => { - const query = 'SELECT student.name, enrollment.course FROM student LEFT JOIN enrollment ON student.id=enrollment.student_id'; - const result = parseQuery(query); - expect(result).toEqual({ - fields: ['student.name', 'enrollment.course'], - table: 'student', - whereClauses: [], - joinType: 'LEFT', - joinTable: 'enrollment', - joinCondition: { left: 'student.id', right: 'enrollment.student_id' }, - groupByFields: null, - hasAggregateWithoutGroupBy: false, - "orderByFields": null, - "limit": null - }) -}) - -test('Parse LEFT Join Query Completely', () => { - const query = 'SELECT student.name, enrollment.course FROM student RIGHT JOIN enrollment ON student.id=enrollment.student_id'; - const result = parseQuery(query); - expect(result).toEqual({ - fields: ['student.name', 'enrollment.course'], - table: 'student', - whereClauses: [], - joinType: 'RIGHT', - joinTable: 'enrollment', - joinCondition: { left: 'student.id', right: 'enrollment.student_id' }, - groupByFields: null, - hasAggregateWithoutGroupBy: false, - "orderByFields": null, - "limit": null - }) -}) - -test('Parse SQL Query with LEFT JOIN with a WHERE clause filtering the main table', async () => { - const query = 'SELECT student.name, enrollment.course FROM student LEFT JOIN enrollment ON student.id=enrollment.student_id WHERE student.age > 22'; - const result = await parseQuery(query); - expect(result).toEqual({ - "fields": ["student.name", "enrollment.course"], - "joinCondition": { "left": "student.id", "right": "enrollment.student_id" }, - "joinTable": "enrollment", - "joinType": "LEFT", - "table": "student", - "whereClauses": [{ "field": "student.age", "operator": ">", "value": "22" }], - groupByFields: null, - hasAggregateWithoutGroupBy: false, - "orderByFields": null, - "limit": null - }); -}); - -test('Parse SQL Query with LEFT JOIN with a WHERE clause filtering the join table', async () => { - const query = `SELECT student.name, enrollment.course FROM student LEFT JOIN enrollment ON student.id=enrollment.student_id WHERE enrollment.course = 'Physics'`; - const result = await parseQuery(query); - expect(result).toEqual({ - "fields": ["student.name", "enrollment.course"], - "joinCondition": { "left": "student.id", "right": "enrollment.student_id" }, - "joinTable": "enrollment", - "joinType": "LEFT", - "table": "student", - "whereClauses": [{ "field": "enrollment.course", "operator": "=", "value": "'Physics'" }], - groupByFields: null, - hasAggregateWithoutGroupBy: false, - "orderByFields": null, - "limit": null - }); -}); - -test('Parse SQL Query with RIGHT JOIN with a WHERE clause filtering the main table', async () => { - const query = 'SELECT student.name, enrollment.course FROM student RIGHT JOIN enrollment ON student.id=enrollment.student_id WHERE student.age < 25'; - const result = await parseQuery(query); - expect(result).toEqual({ - "fields": ["student.name", "enrollment.course"], - "joinCondition": { "left": "student.id", "right": "enrollment.student_id" }, - "joinTable": "enrollment", - "joinType": "RIGHT", - "table": "student", - "whereClauses": [{ "field": "student.age", "operator": "<", "value": "25" }], - groupByFields: null, - hasAggregateWithoutGroupBy: false, - "orderByFields": null, - "limit": null - }); -}); - -test('Parse SQL Query with RIGHT JOIN with a WHERE clause filtering the join table', async () => { - const query = `SELECT student.name, enrollment.course FROM student RIGHT JOIN enrollment ON student.id=enrollment.student_id WHERE enrollment.course = 'Chemistry'`; - const result = await parseQuery(query); - expect(result).toEqual({ - "fields": ["student.name", "enrollment.course"], - "joinCondition": { "left": "student.id", "right": "enrollment.student_id" }, - "joinTable": "enrollment", - "joinType": "RIGHT", - "table": "student", - "whereClauses": [{ "field": "enrollment.course", "operator": "=", "value": "'Chemistry'" }], - groupByFields: null, - hasAggregateWithoutGroupBy: false, - "orderByFields": null, - "limit": null - }); -}); - - -test('Parse COUNT Aggregate Query', () => { - const query = 'SELECT COUNT(*) FROM student'; - const parsed = parseQuery(query); - expect(parsed).toEqual({ - fields: ['COUNT(*)'], - table: 'student', - whereClauses: [], - groupByFields: null, - hasAggregateWithoutGroupBy: true, - "joinCondition": null, - "joinTable": null, - "joinType": null, - "orderByFields": null, - "limit": null - }); -}); - - -test('Parse SUM Aggregate Query', () => { - const query = 'SELECT SUM(age) FROM student'; - const parsed = parseQuery(query); - expect(parsed).toEqual({ - fields: ['SUM(age)'], - table: 'student', - whereClauses: [], - groupByFields: null, - hasAggregateWithoutGroupBy: true, - "joinCondition": null, - "joinTable": null, - "joinType": null, - "orderByFields": null, - "limit": null - }); -}); - -test('Parse AVG Aggregate Query', () => { - const query = 'SELECT AVG(age) FROM student'; - const parsed = parseQuery(query); - expect(parsed).toEqual({ - fields: ['AVG(age)'], - table: 'student', - whereClauses: [], - groupByFields: null, - hasAggregateWithoutGroupBy: true, - "joinCondition": null, - "joinTable": null, - "joinType": null, - "orderByFields": null, - "limit": null - }); -}); - -test('Parse MIN Aggregate Query', () => { - const query = 'SELECT MIN(age) FROM student'; - const parsed = parseQuery(query); - expect(parsed).toEqual({ - fields: ['MIN(age)'], - table: 'student', - whereClauses: [], - groupByFields: null, - hasAggregateWithoutGroupBy: true, - "joinCondition": null, - "joinTable": null, - "joinType": null, - "orderByFields": null, - "limit": null - }); -}); - -test('Parse MAX Aggregate Query', () => { - const query = 'SELECT MAX(age) FROM student'; - const parsed = parseQuery(query); - expect(parsed).toEqual({ - fields: ['MAX(age)'], - table: 'student', - whereClauses: [], - groupByFields: null, - hasAggregateWithoutGroupBy: true, - "joinCondition": null, - "joinTable": null, - "joinType": null, - "orderByFields": null, - "limit": null - }); -}); - -test('Parse basic GROUP BY query', () => { - const query = 'SELECT age, COUNT(*) FROM student GROUP BY age'; - const parsed = parseQuery(query); - expect(parsed).toEqual({ - fields: ['age', 'COUNT(*)'], - table: 'student', - whereClauses: [], - groupByFields: ['age'], - joinType: null, - joinTable: null, - joinCondition: null, - hasAggregateWithoutGroupBy: false, - orderByFields: null, - "limit": null - }); -}); - -test('Parse GROUP BY query with WHERE clause', () => { - const query = 'SELECT age, COUNT(*) FROM student WHERE age > 22 GROUP BY age'; - const parsed = parseQuery(query); - expect(parsed).toEqual({ - fields: ['age', 'COUNT(*)'], - table: 'student', - whereClauses: [{ field: 'age', operator: '>', value: '22' }], - groupByFields: ['age'], - joinType: null, - joinTable: null, - joinCondition: null, - hasAggregateWithoutGroupBy: false, - orderByFields: null, - "limit": null - }); -}); - -test('Parse GROUP BY query with multiple fields', () => { - const query = 'SELECT student_id, course, COUNT(*) FROM enrollment GROUP BY student_id, course'; - const parsed = parseQuery(query); - expect(parsed).toEqual({ - fields: ['student_id', 'course', 'COUNT(*)'], - table: 'enrollment', - whereClauses: [], - groupByFields: ['student_id', 'course'], - joinType: null, - joinTable: null, - joinCondition: null, - hasAggregateWithoutGroupBy: false, - orderByFields: null, - "limit": null - }); -}); - -test('Parse GROUP BY query with JOIN and WHERE clauses', () => { - const query = 'SELECT student.name, COUNT(*) FROM student INNER JOIN enrollment ON student.id = enrollment.student_id WHERE enrollment.course = "Mathematics" GROUP BY student.name'; - const parsed = parseQuery(query); - expect(parsed).toEqual({ - fields: ['student.name', 'COUNT(*)'], - table: 'student', - whereClauses: [{ field: 'enrollment.course', operator: '=', value: '"Mathematics"' }], - groupByFields: ['student.name'], - joinType: 'INNER', - joinTable: 'enrollment', - joinCondition: { - left: 'student.id', - right: 'enrollment.student_id' - }, - hasAggregateWithoutGroupBy: false, - orderByFields: null, - "limit": null, - }); -}); - -test('Execute SQL Query with ORDER BY', async () => { - const query = 'SELECT name FROM student ORDER BY name ASC'; - const result = await executeSELECTQuery(query); - - expect(result).toStrictEqual([ - { name: 'Alice' }, - { name: 'Bob' }, - { name: 'Jane' }, - { name: 'John' } - ]); -}); - -test('Execute SQL Query with ORDER BY and WHERE', async () => { - const query = 'SELECT name FROM student WHERE age > 24 ORDER BY name DESC'; - const result = await executeSELECTQuery(query); - - expect(result).toStrictEqual([ - { name: 'John' }, - { name: 'Jane' }, - ]); -}); -test('Execute SQL Query with ORDER BY and GROUP BY', async () => { - const query = 'SELECT COUNT(id) as count, age FROM student GROUP BY age ORDER BY age DESC'; - const result = await executeSELECTQuery(query); - - expect(result).toStrictEqual([ - { age: '30', 'COUNT(id) as count': 1 }, - { age: '25', 'COUNT(id) as count': 1 }, - { age: '24', 'COUNT(id) as count': 1 }, - { age: '22', 'COUNT(id) as count': 1 } - ]); -}); - -test('Execute SQL Query with standard LIMIT clause', async () => { - const query = 'SELECT id, name FROM student LIMIT 2'; - const result = await executeSELECTQuery(query); - expect(result.length).toEqual(2); -}); - -test('Execute SQL Query with LIMIT clause equal to total rows', async () => { - const query = 'SELECT id, name FROM student LIMIT 4'; - const result = await executeSELECTQuery(query); - expect(result.length).toEqual(4); -}); - -test('Execute SQL Query with LIMIT clause exceeding total rows', async () => { - const query = 'SELECT id, name FROM student LIMIT 10'; - const result = await executeSELECTQuery(query); - expect(result.length).toEqual(4); // Total rows in student.csv -}); - -test('Execute SQL Query with LIMIT 0', async () => { - const query = 'SELECT id, name FROM student LIMIT 0'; - const result = await executeSELECTQuery(query); - expect(result.length).toEqual(0); -}); - -test('Execute SQL Query with LIMIT and ORDER BY clause', async () => { - const query = 'SELECT id, name FROM student ORDER BY age DESC LIMIT 2'; - const result = await executeSELECTQuery(query); - expect(result.length).toEqual(2); - expect(result[0].name).toEqual('John'); - expect(result[1].name).toEqual('Jane'); -}); - -test('Error Handling with Malformed Query', async () => { - const query = 'SELECT FROM table'; // intentionally malformed - await expect(executeSELECTQuery(query)).rejects.toThrow("Error executing query: Query parsing error: Invalid SELECT format"); -}); \ No newline at end of file diff --git a/tests/step-14/index.test.js b/tests/step-14/index.test.js index 502411fa7..fa3a7ae5b 100644 --- a/tests/step-14/index.test.js +++ b/tests/step-14/index.test.js @@ -1,787 +1,836 @@ -const readCSV = require('../../src/csvReader'); -const {parseQuery, parseJoinClause} = require('../../src/queryParser'); -const executeSELECTQuery = require('../../src/index'); - -test('Read CSV File', async () => { - const data = await readCSV('./student.csv'); - expect(data.length).toBeGreaterThan(0); - expect(data.length).toBe(4); - expect(data[0].name).toBe('John'); - expect(data[0].age).toBe('30'); //ignore the string type here, we will fix this later -}); - -test('Execute SQL Query', async () => { - const query = 'SELECT id, name FROM student'; - const result = await executeSELECTQuery(query); - expect(result.length).toBeGreaterThan(0); - expect(result[0]).toHaveProperty('id'); - expect(result[0]).toHaveProperty('name'); - expect(result[0]).not.toHaveProperty('age'); - expect(result[0]).toEqual({ id: '1', name: 'John' }); -}); - -test('Execute SQL Query with WHERE Clause', async () => { - const query = 'SELECT id, name FROM student WHERE age = 25'; - const result = await executeSELECTQuery(query); - expect(result.length).toBe(1); - expect(result[0]).toHaveProperty('id'); - expect(result[0]).toHaveProperty('name'); - expect(result[0].id).toBe('2'); -}); - -test('Execute SQL Query with Complex WHERE Clause', async () => { - const query = 'SELECT id, name FROM student WHERE age = 30 AND name = John'; - const result = await executeSELECTQuery(query); - expect(result.length).toBe(1); - expect(result[0]).toEqual({ id: '1', name: 'John' }); -}); - -test('Execute SQL Query with Greater Than', async () => { - const queryWithGT = 'SELECT id FROM student WHERE age > 22'; - const result = await executeSELECTQuery(queryWithGT); - expect(result.length).toEqual(3); - expect(result[0]).toHaveProperty('id'); -}); - -test('Execute SQL Query with Not Equal to', async () => { - const queryWithGT = 'SELECT name FROM student WHERE age != 25'; - const result = await executeSELECTQuery(queryWithGT); - expect(result.length).toEqual(3); - expect(result[0]).toHaveProperty('name'); -}); - -test('Execute SQL Query with INNER JOIN', async () => { - const query = 'SELECT student.name, enrollment.course FROM student INNER JOIN enrollment ON student.id=enrollment.student_id'; - const result = await executeSELECTQuery(query); - /* - result = [ - { 'student.name': 'John', 'enrollment.course': 'Mathematics' }, - { 'student.name': 'John', 'enrollment.course': 'Physics' }, - { 'student.name': 'Jane', 'enrollment.course': 'Chemistry' }, - { 'student.name': 'Bob', 'enrollment.course': 'Mathematics' } - ] - */ - expect(result.length).toEqual(4); - // toHaveProperty is not working here due to dot in the property name - expect(result[0]).toEqual(expect.objectContaining({ - "enrollment.course": "Mathematics", - "student.name": "John" - })); +const { readCSV } = require("../../src/csvReader"); +const { parseSelectQuery, parseJoinClause } = require("../../src/queryParser"); +const { executeSELECTQuery } = require("../../src/queryExecutor"); + +test("Read CSV File", async () => { + const data = await readCSV("./student.csv"); + expect(data.length).toBeGreaterThan(0); + expect(data.length).toBe(4); + expect(data[0].name).toBe("John"); + expect(data[0].age).toBe("30"); +}); + +test("Execute SQL Query", async () => { + const query = "SELECT id, name FROM student"; + const result = await executeSELECTQuery(query); + expect(result.length).toBeGreaterThan(0); + expect(result[0]).toHaveProperty("id"); + expect(result[0]).toHaveProperty("name"); + expect(result[0]).not.toHaveProperty("age"); + expect(result[0]).toEqual({ id: "1", name: "John" }); +}); + +test("Execute SQL Query with WHERE Clause", async () => { + const query = "SELECT id, name FROM student WHERE age = 25"; + const result = await executeSELECTQuery(query); + expect(result.length).toBe(1); + expect(result[0]).toHaveProperty("id"); + expect(result[0]).toHaveProperty("name"); + expect(result[0].id).toBe("2"); +}); + +test("Execute SQL Query with Complex WHERE Clause", async () => { + const query = "SELECT id, name FROM student WHERE age = 30 AND name = John"; + const result = await executeSELECTQuery(query); + expect(result.length).toBe(1); + expect(result[0]).toEqual({ id: "1", name: "John" }); +}); + +test("Execute SQL Query with Greater Than", async () => { + const queryWithGT = "SELECT id FROM student WHERE age > 22"; + const result = await executeSELECTQuery(queryWithGT); + expect(result.length).toEqual(3); + expect(result[0]).toHaveProperty("id"); +}); + +test("Execute SQL Query with Not Equal to", async () => { + const queryWithGT = "SELECT name FROM student WHERE age != 25"; + const result = await executeSELECTQuery(queryWithGT); + expect(result.length).toEqual(3); + expect(result[0]).toHaveProperty("name"); +}); + +test("Execute SQL Query with INNER JOIN", async () => { + const query = + "SELECT student.name, enrollment.course FROM student INNER JOIN enrollment ON student.id=enrollment.student_id"; + const result = await executeSELECTQuery(query); + expect(result.length).toEqual(4); + expect(result[0]).toEqual( + expect.objectContaining({ + "enrollment.course": "Mathematics", + "student.name": "John", + }) + ); }); -test('Execute SQL Query with INNER JOIN and a WHERE Clause', async () => { - const query = 'SELECT student.name, enrollment.course, student.age FROM student INNER JOIN enrollment ON student.id = enrollment.student_id WHERE student.age > 25'; - const result = await executeSELECTQuery(query); - /* - result = [ +test("Execute SQL Query with INNER JOIN and a WHERE Clause", async () => { + const query = + "SELECT student.name, enrollment.course, student.age FROM student INNER JOIN enrollment ON student.id = enrollment.student_id WHERE student.age > 25"; + const result = await executeSELECTQuery(query); + + expect(result.length).toEqual(2); + expect(result[0]).toEqual( + expect.objectContaining({ + "enrollment.course": "Mathematics", + "student.name": "John", + }) + ); +}); + +test("Execute SQL Query with LEFT JOIN", async () => { + const query = + "SELECT student.name, enrollment.course FROM student LEFT JOIN enrollment ON student.id=enrollment.student_id"; + const result = await executeSELECTQuery(query); + expect(result).toEqual( + expect.arrayContaining([ + expect.objectContaining({ + "student.name": "Alice", + "enrollment.course": null, + }), + expect.objectContaining({ + "student.name": "John", + "enrollment.course": "Mathematics", + }), + ]) + ); + expect(result.length).toEqual(5); +}); + +test("Execute SQL Query with RIGHT JOIN", async () => { + const query = + "SELECT student.name, enrollment.course FROM student RIGHT JOIN enrollment ON student.id=enrollment.student_id"; + const result = await executeSELECTQuery(query); + expect(result).toEqual( + expect.arrayContaining([ + expect.objectContaining({ + "student.name": null, + "enrollment.course": "Biology", + }), + expect.objectContaining({ + "student.name": "John", + "enrollment.course": "Mathematics", + }), + ]) + ); + expect(result.length).toEqual(5); +}); + +test("Execute SQL Query with LEFT JOIN with a WHERE clause filtering the main table", async () => { + const query = + "SELECT student.name, enrollment.course FROM student LEFT JOIN enrollment ON student.id=enrollment.student_id WHERE student.age > 22"; + const result = await executeSELECTQuery(query); + expect(result).toEqual( + expect.arrayContaining([ + expect.objectContaining({ + "enrollment.course": "Mathematics", + "student.name": "John", + }), + expect.objectContaining({ + "enrollment.course": "Physics", + "student.name": "John", + }), + ]) + ); + expect(result.length).toEqual(4); +}); + +test("Execute SQL Query with LEFT JOIN with a WHERE clause filtering the join table", async () => { + const query = `SELECT student.name, enrollment.course FROM student LEFT JOIN enrollment ON student.id=enrollment.student_id WHERE enrollment.course = 'Physics'`; + const result = await executeSELECTQuery(query); + expect(result).toEqual( + expect.arrayContaining([ + expect.objectContaining({ + "student.name": "John", + "enrollment.course": "Physics", + }), + ]) + ); + expect(result.length).toEqual(1); +}); + +test("Execute SQL Query with RIGHT JOIN with a WHERE clause filtering the main table", async () => { + const query = + "SELECT student.name, enrollment.course FROM student RIGHT JOIN enrollment ON student.id=enrollment.student_id WHERE student.age < 25"; + const result = await executeSELECTQuery(query); + expect(result).toEqual( + expect.arrayContaining([ + expect.objectContaining({ + "enrollment.course": "Mathematics", + "student.name": "Bob", + }), + expect.objectContaining({ + "enrollment.course": "Biology", + "student.name": null, + }), + ]) + ); + expect(result.length).toEqual(2); +}); + +test("Execute SQL Query with RIGHT JOIN with a WHERE clause filtering the join table", async () => { + const query = `SELECT student.name, enrollment.course FROM student RIGHT JOIN enrollment ON student.id=enrollment.student_id WHERE enrollment.course = 'Chemistry'`; + const result = await executeSELECTQuery(query); + expect(result).toEqual( + expect.arrayContaining([ + expect.objectContaining({ + "enrollment.course": "Chemistry", + "student.name": "Jane", + }), + ]) + ); + expect(result.length).toEqual(1); +}); + +test("Execute SQL Query with RIGHT JOIN with a multiple WHERE clauses filtering the join table and main table", async () => { + const query = `SELECT student.name, enrollment.course FROM student RIGHT JOIN enrollment ON student.id=enrollment.student_id WHERE enrollment.course = 'Chemistry' AND student.age = 26`; + const result = await executeSELECTQuery(query); + expect(result).toEqual([]); +}); + +test("Execute COUNT Aggregate Query", async () => { + const query = "SELECT COUNT(*) FROM student"; + const result = await executeSELECTQuery(query); + expect(result).toEqual([{ "COUNT(*)": 4 }]); +}); + +test("Execute SUM Aggregate Query", async () => { + const query = "SELECT SUM(age) FROM student"; + const result = await executeSELECTQuery(query); + expect(result).toEqual([{ "SUM(age)": 101 }]); +}); + +test("Execute AVG Aggregate Query", async () => { + const query = "SELECT AVG(age) FROM student"; + const result = await executeSELECTQuery(query); + expect(result).toEqual([{ "AVG(age)": 25.25 }]); +}); + +test("Execute MIN Aggregate Query", async () => { + const query = "SELECT MIN(age) FROM student"; + const result = await executeSELECTQuery(query); + expect(result).toEqual([{ "MIN(age)": 22 }]); +}); + +test("Execute MAX Aggregate Query", async () => { + const query = "SELECT MAX(age) FROM student"; + const result = await executeSELECTQuery(query); + expect(result).toEqual([{ "MAX(age)": 30 }]); +}); + +test("Count students per age", async () => { + const query = "SELECT age, COUNT(*) FROM student GROUP BY age"; + const result = await executeSELECTQuery(query); + expect(result).toEqual([ + { age: "22", "COUNT(*)": 1 }, + { age: "24", "COUNT(*)": 1 }, + { age: "25", "COUNT(*)": 1 }, + { age: "30", "COUNT(*)": 1 }, + ]); +}); + +test("Count enrollments per course", async () => { + const query = "SELECT course, COUNT(*) FROM enrollment GROUP BY course"; + const result = await executeSELECTQuery(query); + expect(result).toEqual([ + { course: "Mathematics", "COUNT(*)": 2 }, + { course: "Physics", "COUNT(*)": 1 }, + { course: "Chemistry", "COUNT(*)": 1 }, + { course: "Biology", "COUNT(*)": 1 }, + ]); +}); + +test("Count courses per student", async () => { + const query = + "SELECT student_id, COUNT(*) FROM enrollment GROUP BY student_id"; + const result = await executeSELECTQuery(query); + expect(result).toEqual([ + { student_id: "1", "COUNT(*)": 2 }, + { student_id: "2", "COUNT(*)": 1 }, + { student_id: "3", "COUNT(*)": 1 }, + { student_id: "5", "COUNT(*)": 1 }, + ]); +}); + +test("Count students within a specific age range", async () => { + const query = "SELECT age, COUNT(*) FROM student WHERE age > 22 GROUP BY age"; + const result = await executeSELECTQuery(query); + expect(result).toEqual([ + { age: "24", "COUNT(*)": 1 }, + { age: "25", "COUNT(*)": 1 }, + { age: "30", "COUNT(*)": 1 }, + ]); +}); + +test("Count enrollments for a specific course", async () => { + const query = + 'SELECT course, COUNT(*) FROM enrollment WHERE course = "Mathematics" GROUP BY course'; + const result = await executeSELECTQuery(query); + expect(result).toEqual([{ course: "Mathematics", "COUNT(*)": 2 }]); +}); + +test("Count courses for a specific student", async () => { + const query = + "SELECT student_id, COUNT(*) FROM enrollment WHERE student_id = 1 GROUP BY student_id"; + const result = await executeSELECTQuery(query); + expect(result).toEqual([{ student_id: "1", "COUNT(*)": 2 }]); +}); + +test("Average age of students above a certain age", async () => { + const query = "SELECT AVG(age) FROM student WHERE age > 22"; + const result = await executeSELECTQuery(query); + const expectedAverage = (25 + 30 + 24) / 3; // Average age of students older than 22 + expect(result).toEqual([{ "AVG(age)": expectedAverage }]); +}); + +test("Parse SQL Query", () => { + const query = "SELECT id, name FROM student"; + const parsed = parseSelectQuery(query); + expect(parsed).toEqual({ + fields: ["id", "name"], + table: "student", + whereClauses: [], + joinCondition: null, + joinTable: null, + joinType: null, + groupByFields: null, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse SQL Query with WHERE Clause", () => { + const query = "SELECT id, name FROM student WHERE age = 25"; + const parsed = parseSelectQuery(query); + expect(parsed).toEqual({ + fields: ["id", "name"], + table: "student", + whereClauses: [ { - 'student.name': 'John', - 'enrollment.course': 'Mathematics', - 'student.age': '30' + field: "age", + operator: "=", + value: "25", }, + ], + joinCondition: null, + joinTable: null, + joinType: null, + groupByFields: null, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse SQL Query with Multiple WHERE Clauses", () => { + const query = "SELECT id, name FROM student WHERE age = 30 AND name = John"; + const parsed = parseSelectQuery(query); + expect(parsed).toEqual({ + fields: ["id", "name"], + table: "student", + whereClauses: [ { - 'student.name': 'John', - 'enrollment.course': 'Physics', - 'student.age': '30' - } - ] - */ - expect(result.length).toEqual(2); - // toHaveProperty is not working here due to dot in the property name - expect(result[0]).toEqual(expect.objectContaining({ - "enrollment.course": "Mathematics", - "student.name": "John" - })); -}); - -test('Execute SQL Query with LEFT JOIN', async () => { - const query = 'SELECT student.name, enrollment.course FROM student LEFT JOIN enrollment ON student.id=enrollment.student_id'; - const result = await executeSELECTQuery(query); - expect(result).toEqual(expect.arrayContaining([ - expect.objectContaining({ "student.name": "Alice", "enrollment.course": null }), - expect.objectContaining({ "student.name": "John", "enrollment.course": "Mathematics" }) - ])); - expect(result.length).toEqual(5); // 4 students, but John appears twice -}); - -test('Execute SQL Query with RIGHT JOIN', async () => { - const query = 'SELECT student.name, enrollment.course FROM student RIGHT JOIN enrollment ON student.id=enrollment.student_id'; - const result = await executeSELECTQuery(query); - expect(result).toEqual(expect.arrayContaining([ - expect.objectContaining({ "student.name": null, "enrollment.course": "Biology" }), - expect.objectContaining({ "student.name": "John", "enrollment.course": "Mathematics" }) - ])); - expect(result.length).toEqual(5); // 4 courses, but Mathematics appears twice -}); - -test('Execute SQL Query with LEFT JOIN with a WHERE clause filtering the main table', async () => { - const query = 'SELECT student.name, enrollment.course FROM student LEFT JOIN enrollment ON student.id=enrollment.student_id WHERE student.age > 22'; - const result = await executeSELECTQuery(query); - expect(result).toEqual(expect.arrayContaining([ - expect.objectContaining({ "enrollment.course": "Mathematics", "student.name": "John" }), - expect.objectContaining({ "enrollment.course": "Physics", "student.name": "John" }) - ])); - expect(result.length).toEqual(4); -}); - -test('Execute SQL Query with LEFT JOIN with a WHERE clause filtering the join table', async () => { - const query = `SELECT student.name, enrollment.course FROM student LEFT JOIN enrollment ON student.id=enrollment.student_id WHERE enrollment.course = 'Physics'`; - const result = await executeSELECTQuery(query); - expect(result).toEqual(expect.arrayContaining([ - expect.objectContaining({ "student.name": "John", "enrollment.course": "Physics" }) - ])); - expect(result.length).toEqual(1); -}); - -test('Execute SQL Query with RIGHT JOIN with a WHERE clause filtering the main table', async () => { - const query = 'SELECT student.name, enrollment.course FROM student RIGHT JOIN enrollment ON student.id=enrollment.student_id WHERE student.age < 25'; - const result = await executeSELECTQuery(query); - expect(result).toEqual(expect.arrayContaining([ - expect.objectContaining({ "enrollment.course": "Mathematics", "student.name": "Bob" }), - expect.objectContaining({ "enrollment.course": "Biology", "student.name": null }) - ])); - expect(result.length).toEqual(2); -}); - -test('Execute SQL Query with RIGHT JOIN with a WHERE clause filtering the join table', async () => { - const query = `SELECT student.name, enrollment.course FROM student RIGHT JOIN enrollment ON student.id=enrollment.student_id WHERE enrollment.course = 'Chemistry'`; - const result = await executeSELECTQuery(query); - expect(result).toEqual(expect.arrayContaining([ - expect.objectContaining({ "enrollment.course": "Chemistry", "student.name": "Jane" }), - ])); - expect(result.length).toEqual(1); -}); - -test('Execute SQL Query with RIGHT JOIN with a multiple WHERE clauses filtering the join table and main table', async () => { - const query = `SELECT student.name, enrollment.course FROM student RIGHT JOIN enrollment ON student.id=enrollment.student_id WHERE enrollment.course = 'Chemistry' AND student.age = 26`; - const result = await executeSELECTQuery(query); - expect(result).toEqual([]); -}); - -test('Execute COUNT Aggregate Query', async () => { - const query = 'SELECT COUNT(*) FROM student'; - const result = await executeSELECTQuery(query); - expect(result).toEqual([{ 'COUNT(*)': 4 }]); -}); - -test('Execute SUM Aggregate Query', async () => { - const query = 'SELECT SUM(age) FROM student'; - const result = await executeSELECTQuery(query); - expect(result).toEqual([{ 'SUM(age)': 101 }]); -}); - -test('Execute AVG Aggregate Query', async () => { - const query = 'SELECT AVG(age) FROM student'; - const result = await executeSELECTQuery(query); - // Assuming AVG returns a single decimal point value - expect(result).toEqual([{ 'AVG(age)': 25.25 }]); -}); - -test('Execute MIN Aggregate Query', async () => { - const query = 'SELECT MIN(age) FROM student'; - const result = await executeSELECTQuery(query); - expect(result).toEqual([{ 'MIN(age)': 22 }]); -}); - -test('Execute MAX Aggregate Query', async () => { - const query = 'SELECT MAX(age) FROM student'; - const result = await executeSELECTQuery(query); - expect(result).toEqual([{ 'MAX(age)': 30 }]); -}); - -test('Count students per age', async () => { - const query = 'SELECT age, COUNT(*) FROM student GROUP BY age'; - const result = await executeSELECTQuery(query); - expect(result).toEqual([ - { age: '22', 'COUNT(*)': 1 }, - { age: '24', 'COUNT(*)': 1 }, - { age: '25', 'COUNT(*)': 1 }, - { age: '30', 'COUNT(*)': 1 } - ]); -}); - -test('Count enrollments per course', async () => { - const query = 'SELECT course, COUNT(*) FROM enrollment GROUP BY course'; - const result = await executeSELECTQuery(query); - expect(result).toEqual([ - { course: 'Mathematics', 'COUNT(*)': 2 }, - { course: 'Physics', 'COUNT(*)': 1 }, - { course: 'Chemistry', 'COUNT(*)': 1 }, - { course: 'Biology', 'COUNT(*)': 1 } - ]); -}); - - -test('Count courses per student', async () => { - const query = 'SELECT student_id, COUNT(*) FROM enrollment GROUP BY student_id'; - const result = await executeSELECTQuery(query); - expect(result).toEqual([ - { student_id: '1', 'COUNT(*)': 2 }, - { student_id: '2', 'COUNT(*)': 1 }, - { student_id: '3', 'COUNT(*)': 1 }, - { student_id: '5', 'COUNT(*)': 1 } - ]); -}); - -test('Count students within a specific age range', async () => { - const query = 'SELECT age, COUNT(*) FROM student WHERE age > 22 GROUP BY age'; - const result = await executeSELECTQuery(query); - expect(result).toEqual([ - { age: '24', 'COUNT(*)': 1 }, - { age: '25', 'COUNT(*)': 1 }, - { age: '30', 'COUNT(*)': 1 } - ]); -}); - -test('Count enrollments for a specific course', async () => { - const query = 'SELECT course, COUNT(*) FROM enrollment WHERE course = "Mathematics" GROUP BY course'; - const result = await executeSELECTQuery(query); - expect(result).toEqual([ - { course: 'Mathematics', 'COUNT(*)': 2 } - ]); -}); - -test('Count courses for a specific student', async () => { - const query = 'SELECT student_id, COUNT(*) FROM enrollment WHERE student_id = 1 GROUP BY student_id'; - const result = await executeSELECTQuery(query); - expect(result).toEqual([ - { student_id: '1', 'COUNT(*)': 2 } - ]); -}); - -test('Average age of students above a certain age', async () => { - const query = 'SELECT AVG(age) FROM student WHERE age > 22'; - const result = await executeSELECTQuery(query); - const expectedAverage = (25 + 30 + 24) / 3; // Average age of students older than 22 - expect(result).toEqual([{ 'AVG(age)': expectedAverage }]); -}); - -test('Parse SQL Query', () => { - const query = 'SELECT id, name FROM student'; - const parsed = parseQuery(query); - expect(parsed).toEqual({ - fields: ['id', 'name'], - table: 'student', - whereClauses: [], - joinCondition: null, - joinTable: null, - joinType: null, - groupByFields: null, - hasAggregateWithoutGroupBy: false, - "orderByFields": null, - "limit": null, - isDistinct: false - }); -}); - -test('Parse SQL Query with WHERE Clause', () => { - const query = 'SELECT id, name FROM student WHERE age = 25'; - const parsed = parseQuery(query); - expect(parsed).toEqual({ - fields: ['id', 'name'], - table: 'student', - whereClauses: [{ - "field": "age", - "operator": "=", - "value": "25", - }], - joinCondition: null, - joinTable: null, - joinType: null, - groupByFields: null, - hasAggregateWithoutGroupBy: false, - "orderByFields": null, - "limit": null, - isDistinct: false - }); -}); - -test('Parse SQL Query with Multiple WHERE Clauses', () => { - const query = 'SELECT id, name FROM student WHERE age = 30 AND name = John'; - const parsed = parseQuery(query); - expect(parsed).toEqual({ - fields: ['id', 'name'], - table: 'student', - whereClauses: [{ - "field": "age", - "operator": "=", - "value": "30", - }, { - "field": "name", - "operator": "=", - "value": "John", - }], - joinCondition: null, - joinTable: null, - joinType: null, - groupByFields: null, - hasAggregateWithoutGroupBy: false, - "orderByFields": null, - "limit": null, - isDistinct: false - }); -}); - -test('Parse SQL Query with INNER JOIN', async () => { - const query = 'SELECT student.name, enrollment.course FROM student INNER JOIN enrollment ON student.id=enrollment.student_id'; - const result = await parseQuery(query); - expect(result).toEqual({ - fields: ['student.name', 'enrollment.course'], - table: 'student', - whereClauses: [], - joinTable: 'enrollment', - joinType: "INNER", - joinCondition: { left: 'student.id', right: 'enrollment.student_id' }, - groupByFields: null, - hasAggregateWithoutGroupBy: false, - "orderByFields": null, - "limit": null, - isDistinct: false - }) -}); - -test('Parse SQL Query with INNER JOIN and WHERE Clause', async () => { - const query = 'SELECT student.name, enrollment.course FROM student INNER JOIN enrollment ON student.id = enrollment.student_id WHERE student.age > 20'; - const result = await parseQuery(query); - expect(result).toEqual({ - fields: ['student.name', 'enrollment.course'], - table: 'student', - whereClauses: [{ field: 'student.age', operator: '>', value: '20' }], - joinTable: 'enrollment', - joinType: "INNER", - joinCondition: { left: 'student.id', right: 'enrollment.student_id' }, - groupByFields: null, - hasAggregateWithoutGroupBy: false, - "orderByFields": null, - "limit": null, - isDistinct: false - }) + field: "age", + operator: "=", + value: "30", + }, + { + field: "name", + operator: "=", + value: "John", + }, + ], + joinCondition: null, + joinTable: null, + joinType: null, + groupByFields: null, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse SQL Query with INNER JOIN", async () => { + const query = + "SELECT student.name, enrollment.course FROM student INNER JOIN enrollment ON student.id=enrollment.student_id"; + const result = await parseSelectQuery(query); + expect(result).toEqual({ + fields: ["student.name", "enrollment.course"], + table: "student", + whereClauses: [], + joinTable: "enrollment", + joinType: "INNER", + joinCondition: { left: "student.id", right: "enrollment.student_id" }, + groupByFields: null, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse SQL Query with INNER JOIN and WHERE Clause", async () => { + const query = + "SELECT student.name, enrollment.course FROM student INNER JOIN enrollment ON student.id = enrollment.student_id WHERE student.age > 20"; + const result = await parseSelectQuery(query); + expect(result).toEqual({ + fields: ["student.name", "enrollment.course"], + table: "student", + whereClauses: [{ field: "student.age", operator: ">", value: "20" }], + joinTable: "enrollment", + joinType: "INNER", + joinCondition: { left: "student.id", right: "enrollment.student_id" }, + groupByFields: null, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse INNER JOIN clause", () => { + const query = + "SELECT * FROM table1 INNER JOIN table2 ON table1.id = table2.ref_id"; + const result = parseJoinClause(query); + expect(result).toEqual({ + joinType: "INNER", + joinTable: "table2", + joinCondition: { left: "table1.id", right: "table2.ref_id" }, + }); +}); + +test("Parse LEFT JOIN clause", () => { + const query = + "SELECT * FROM table1 LEFT JOIN table2 ON table1.id = table2.ref_id"; + const result = parseJoinClause(query); + expect(result).toEqual({ + joinType: "LEFT", + joinTable: "table2", + joinCondition: { left: "table1.id", right: "table2.ref_id" }, + }); +}); + +test("Parse RIGHT JOIN clause", () => { + const query = + "SELECT * FROM table1 RIGHT JOIN table2 ON table1.id = table2.ref_id"; + const result = parseJoinClause(query); + expect(result).toEqual({ + joinType: "RIGHT", + joinTable: "table2", + joinCondition: { left: "table1.id", right: "table2.ref_id" }, + }); +}); + +test("Returns null for queries without JOIN", () => { + const query = "SELECT * FROM table1"; + const result = parseJoinClause(query); + expect(result).toEqual({ + joinType: null, + joinTable: null, + joinCondition: null, + }); +}); + +test("Parse LEFT Join Query Completely", () => { + const query = + "SELECT student.name, enrollment.course FROM student LEFT JOIN enrollment ON student.id=enrollment.student_id"; + const result = parseSelectQuery(query); + expect(result).toEqual({ + fields: ["student.name", "enrollment.course"], + table: "student", + whereClauses: [], + joinType: "LEFT", + joinTable: "enrollment", + joinCondition: { left: "student.id", right: "enrollment.student_id" }, + groupByFields: null, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse LEFT Join Query Completely", () => { + const query = + "SELECT student.name, enrollment.course FROM student RIGHT JOIN enrollment ON student.id=enrollment.student_id"; + const result = parseSelectQuery(query); + expect(result).toEqual({ + fields: ["student.name", "enrollment.course"], + table: "student", + whereClauses: [], + joinType: "RIGHT", + joinTable: "enrollment", + joinCondition: { left: "student.id", right: "enrollment.student_id" }, + groupByFields: null, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse SQL Query with LEFT JOIN with a WHERE clause filtering the main table", async () => { + const query = + "SELECT student.name, enrollment.course FROM student LEFT JOIN enrollment ON student.id=enrollment.student_id WHERE student.age > 22"; + const result = await parseSelectQuery(query); + expect(result).toEqual({ + fields: ["student.name", "enrollment.course"], + joinCondition: { left: "student.id", right: "enrollment.student_id" }, + joinTable: "enrollment", + joinType: "LEFT", + table: "student", + whereClauses: [{ field: "student.age", operator: ">", value: "22" }], + groupByFields: null, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse SQL Query with LEFT JOIN with a WHERE clause filtering the join table", async () => { + const query = `SELECT student.name, enrollment.course FROM student LEFT JOIN enrollment ON student.id=enrollment.student_id WHERE enrollment.course = 'Physics'`; + const result = await parseSelectQuery(query); + expect(result).toEqual({ + fields: ["student.name", "enrollment.course"], + joinCondition: { left: "student.id", right: "enrollment.student_id" }, + joinTable: "enrollment", + joinType: "LEFT", + table: "student", + whereClauses: [ + { field: "enrollment.course", operator: "=", value: "'Physics'" }, + ], + groupByFields: null, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse SQL Query with RIGHT JOIN with a WHERE clause filtering the main table", async () => { + const query = + "SELECT student.name, enrollment.course FROM student RIGHT JOIN enrollment ON student.id=enrollment.student_id WHERE student.age < 25"; + const result = await parseSelectQuery(query); + expect(result).toEqual({ + fields: ["student.name", "enrollment.course"], + joinCondition: { left: "student.id", right: "enrollment.student_id" }, + joinTable: "enrollment", + joinType: "RIGHT", + table: "student", + whereClauses: [{ field: "student.age", operator: "<", value: "25" }], + groupByFields: null, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse SQL Query with RIGHT JOIN with a WHERE clause filtering the join table", async () => { + const query = `SELECT student.name, enrollment.course FROM student RIGHT JOIN enrollment ON student.id=enrollment.student_id WHERE enrollment.course = 'Chemistry'`; + const result = await parseSelectQuery(query); + expect(result).toEqual({ + fields: ["student.name", "enrollment.course"], + joinCondition: { left: "student.id", right: "enrollment.student_id" }, + joinTable: "enrollment", + joinType: "RIGHT", + table: "student", + whereClauses: [ + { field: "enrollment.course", operator: "=", value: "'Chemistry'" }, + ], + groupByFields: null, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse COUNT Aggregate Query", () => { + const query = "SELECT COUNT(*) FROM student"; + const parsed = parseSelectQuery(query); + expect(parsed).toEqual({ + fields: ["COUNT(*)"], + table: "student", + whereClauses: [], + groupByFields: null, + hasAggregateWithoutGroupBy: true, + joinCondition: null, + joinTable: null, + joinType: null, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse SUM Aggregate Query", () => { + const query = "SELECT SUM(age) FROM student"; + const parsed = parseSelectQuery(query); + expect(parsed).toEqual({ + fields: ["SUM(age)"], + table: "student", + whereClauses: [], + groupByFields: null, + hasAggregateWithoutGroupBy: true, + joinCondition: null, + joinTable: null, + joinType: null, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse AVG Aggregate Query", () => { + const query = "SELECT AVG(age) FROM student"; + const parsed = parseSelectQuery(query); + expect(parsed).toEqual({ + fields: ["AVG(age)"], + table: "student", + whereClauses: [], + groupByFields: null, + hasAggregateWithoutGroupBy: true, + joinCondition: null, + joinTable: null, + joinType: null, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse MIN Aggregate Query", () => { + const query = "SELECT MIN(age) FROM student"; + const parsed = parseSelectQuery(query); + expect(parsed).toEqual({ + fields: ["MIN(age)"], + table: "student", + whereClauses: [], + groupByFields: null, + hasAggregateWithoutGroupBy: true, + joinCondition: null, + joinTable: null, + joinType: null, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse MAX Aggregate Query", () => { + const query = "SELECT MAX(age) FROM student"; + const parsed = parseSelectQuery(query); + expect(parsed).toEqual({ + fields: ["MAX(age)"], + table: "student", + whereClauses: [], + groupByFields: null, + hasAggregateWithoutGroupBy: true, + joinCondition: null, + joinTable: null, + joinType: null, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse basic GROUP BY query", () => { + const query = "SELECT age, COUNT(*) FROM student GROUP BY age"; + const parsed = parseSelectQuery(query); + expect(parsed).toEqual({ + fields: ["age", "COUNT(*)"], + table: "student", + whereClauses: [], + groupByFields: ["age"], + joinType: null, + joinTable: null, + joinCondition: null, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse GROUP BY query with WHERE clause", () => { + const query = "SELECT age, COUNT(*) FROM student WHERE age > 22 GROUP BY age"; + const parsed = parseSelectQuery(query); + expect(parsed).toEqual({ + fields: ["age", "COUNT(*)"], + table: "student", + whereClauses: [{ field: "age", operator: ">", value: "22" }], + groupByFields: ["age"], + joinType: null, + joinTable: null, + joinCondition: null, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse GROUP BY query with multiple fields", () => { + const query = + "SELECT student_id, course, COUNT(*) FROM enrollment GROUP BY student_id, course"; + const parsed = parseSelectQuery(query); + expect(parsed).toEqual({ + fields: ["student_id", "course", "COUNT(*)"], + table: "enrollment", + whereClauses: [], + groupByFields: ["student_id", "course"], + joinType: null, + joinTable: null, + joinCondition: null, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse GROUP BY query with JOIN and WHERE clauses", () => { + const query = + 'SELECT student.name, COUNT(*) FROM student INNER JOIN enrollment ON student.id = enrollment.student_id WHERE enrollment.course = "Mathematics" GROUP BY student.name'; + const parsed = parseSelectQuery(query); + expect(parsed).toEqual({ + fields: ["student.name", "COUNT(*)"], + table: "student", + whereClauses: [ + { field: "enrollment.course", operator: "=", value: '"Mathematics"' }, + ], + groupByFields: ["student.name"], + joinType: "INNER", + joinTable: "enrollment", + joinCondition: { + left: "student.id", + right: "enrollment.student_id", + }, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Execute SQL Query with ORDER BY", async () => { + const query = "SELECT name FROM student ORDER BY name ASC"; + const result = await executeSELECTQuery(query); + + expect(result).toStrictEqual([ + { name: "Alice" }, + { name: "Bob" }, + { name: "Jane" }, + { name: "John" }, + ]); +}); + +test("Execute SQL Query with ORDER BY and WHERE", async () => { + const query = "SELECT name FROM student WHERE age > 24 ORDER BY name DESC"; + const result = await executeSELECTQuery(query); + + expect(result).toStrictEqual([{ name: "John" }, { name: "Jane" }]); +}); +test("Execute SQL Query with ORDER BY and GROUP BY", async () => { + const query = + "SELECT COUNT(id) as count, age FROM student GROUP BY age ORDER BY age DESC"; + const result = await executeSELECTQuery(query); + + expect(result).toStrictEqual([ + { age: "30", "COUNT(id) as count": 1 }, + { age: "25", "COUNT(id) as count": 1 }, + { age: "24", "COUNT(id) as count": 1 }, + { age: "22", "COUNT(id) as count": 1 }, + ]); +}); + +test("Execute SQL Query with standard LIMIT clause", async () => { + const query = "SELECT id, name FROM student LIMIT 2"; + const result = await executeSELECTQuery(query); + expect(result.length).toEqual(2); +}); + +test("Execute SQL Query with LIMIT clause equal to total rows", async () => { + const query = "SELECT id, name FROM student LIMIT 4"; + const result = await executeSELECTQuery(query); + expect(result.length).toEqual(4); +}); + +test("Execute SQL Query with LIMIT clause exceeding total rows", async () => { + const query = "SELECT id, name FROM student LIMIT 10"; + const result = await executeSELECTQuery(query); + expect(result.length).toEqual(4); +}); + +test("Execute SQL Query with LIMIT 0", async () => { + const query = "SELECT id, name FROM student LIMIT 0"; + const result = await executeSELECTQuery(query); + expect(result.length).toEqual(0); +}); + +test("Execute SQL Query with LIMIT and ORDER BY clause", async () => { + const query = "SELECT id, name FROM student ORDER BY age DESC LIMIT 2"; + const result = await executeSELECTQuery(query); + expect(result.length).toEqual(2); + expect(result[0].name).toEqual("John"); + expect(result[1].name).toEqual("Jane"); +}); + +test("Error Handling with Malformed Query", async () => { + const query = "SELECT FROM table"; + await expect(executeSELECTQuery(query)).rejects.toThrow( + "Error executing query: Query parsing error: Invalid SELECT format" + ); +}); + +test("Basic DISTINCT Usage", async () => { + const query = "SELECT DISTINCT age FROM student"; + const result = await executeSELECTQuery(query); + expect(result).toEqual([ + { age: "30" }, + { age: "25" }, + { age: "22" }, + { age: "24" }, + ]); +}); + +test("DISTINCT with Multiple Columns", async () => { + const query = "SELECT DISTINCT student_id, course FROM enrollment"; + const result = await executeSELECTQuery(query); + expect(result).toEqual([ + { student_id: "1", course: "Mathematics" }, + { student_id: "1", course: "Physics" }, + { student_id: "2", course: "Chemistry" }, + { student_id: "3", course: "Mathematics" }, + { student_id: "5", course: "Biology" }, + ]); }); -test('Parse INNER JOIN clause', () => { - const query = 'SELECT * FROM table1 INNER JOIN table2 ON table1.id = table2.ref_id'; - const result = parseJoinClause(query); - expect(result).toEqual({ - joinType: 'INNER', - joinTable: 'table2', - joinCondition: { left: 'table1.id', right: 'table2.ref_id' }, - }); -}); - -test('Parse LEFT JOIN clause', () => { - const query = 'SELECT * FROM table1 LEFT JOIN table2 ON table1.id = table2.ref_id'; - const result = parseJoinClause(query); - expect(result).toEqual({ - joinType: 'LEFT', - joinTable: 'table2', - joinCondition: { left: 'table1.id', right: 'table2.ref_id' } - }); -}); - -test('Parse RIGHT JOIN clause', () => { - const query = 'SELECT * FROM table1 RIGHT JOIN table2 ON table1.id = table2.ref_id'; - const result = parseJoinClause(query); - expect(result).toEqual({ - joinType: 'RIGHT', - joinTable: 'table2', - joinCondition: { left: 'table1.id', right: 'table2.ref_id' } - }); -}); - -test('Returns null for queries without JOIN', () => { - const query = 'SELECT * FROM table1'; - const result = parseJoinClause(query); - expect(result).toEqual( - { - joinType: null, - joinTable: null, - joinCondition: null - } - ); -}); - -test('Parse LEFT Join Query Completely', () => { - const query = 'SELECT student.name, enrollment.course FROM student LEFT JOIN enrollment ON student.id=enrollment.student_id'; - const result = parseQuery(query); - expect(result).toEqual({ - fields: ['student.name', 'enrollment.course'], - table: 'student', - whereClauses: [], - joinType: 'LEFT', - joinTable: 'enrollment', - joinCondition: { left: 'student.id', right: 'enrollment.student_id' }, - groupByFields: null, - hasAggregateWithoutGroupBy: false, - "orderByFields": null, - "limit": null, - isDistinct: false - }) -}) - -test('Parse LEFT Join Query Completely', () => { - const query = 'SELECT student.name, enrollment.course FROM student RIGHT JOIN enrollment ON student.id=enrollment.student_id'; - const result = parseQuery(query); - expect(result).toEqual({ - fields: ['student.name', 'enrollment.course'], - table: 'student', - whereClauses: [], - joinType: 'RIGHT', - joinTable: 'enrollment', - joinCondition: { left: 'student.id', right: 'enrollment.student_id' }, - groupByFields: null, - hasAggregateWithoutGroupBy: false, - "orderByFields": null, - "limit": null, - isDistinct: false - }) -}) - -test('Parse SQL Query with LEFT JOIN with a WHERE clause filtering the main table', async () => { - const query = 'SELECT student.name, enrollment.course FROM student LEFT JOIN enrollment ON student.id=enrollment.student_id WHERE student.age > 22'; - const result = await parseQuery(query); - expect(result).toEqual({ - "fields": ["student.name", "enrollment.course"], - "joinCondition": { "left": "student.id", "right": "enrollment.student_id" }, - "joinTable": "enrollment", - "joinType": "LEFT", - "table": "student", - "whereClauses": [{ "field": "student.age", "operator": ">", "value": "22" }], - groupByFields: null, - hasAggregateWithoutGroupBy: false, - "orderByFields": null, - "limit": null, - isDistinct: false - }); -}); - -test('Parse SQL Query with LEFT JOIN with a WHERE clause filtering the join table', async () => { - const query = `SELECT student.name, enrollment.course FROM student LEFT JOIN enrollment ON student.id=enrollment.student_id WHERE enrollment.course = 'Physics'`; - const result = await parseQuery(query); - expect(result).toEqual({ - "fields": ["student.name", "enrollment.course"], - "joinCondition": { "left": "student.id", "right": "enrollment.student_id" }, - "joinTable": "enrollment", - "joinType": "LEFT", - "table": "student", - "whereClauses": [{ "field": "enrollment.course", "operator": "=", "value": "'Physics'" }], - groupByFields: null, - hasAggregateWithoutGroupBy: false, - "orderByFields": null, - "limit": null, - isDistinct: false - }); -}); - -test('Parse SQL Query with RIGHT JOIN with a WHERE clause filtering the main table', async () => { - const query = 'SELECT student.name, enrollment.course FROM student RIGHT JOIN enrollment ON student.id=enrollment.student_id WHERE student.age < 25'; - const result = await parseQuery(query); - expect(result).toEqual({ - "fields": ["student.name", "enrollment.course"], - "joinCondition": { "left": "student.id", "right": "enrollment.student_id" }, - "joinTable": "enrollment", - "joinType": "RIGHT", - "table": "student", - "whereClauses": [{ "field": "student.age", "operator": "<", "value": "25" }], - groupByFields: null, - hasAggregateWithoutGroupBy: false, - "orderByFields": null, - "limit": null, - isDistinct: false - }); -}); - -test('Parse SQL Query with RIGHT JOIN with a WHERE clause filtering the join table', async () => { - const query = `SELECT student.name, enrollment.course FROM student RIGHT JOIN enrollment ON student.id=enrollment.student_id WHERE enrollment.course = 'Chemistry'`; - const result = await parseQuery(query); - expect(result).toEqual({ - "fields": ["student.name", "enrollment.course"], - "joinCondition": { "left": "student.id", "right": "enrollment.student_id" }, - "joinTable": "enrollment", - "joinType": "RIGHT", - "table": "student", - "whereClauses": [{ "field": "enrollment.course", "operator": "=", "value": "'Chemistry'" }], - groupByFields: null, - hasAggregateWithoutGroupBy: false, - "orderByFields": null, - "limit": null, - isDistinct: false - }); -}); - - -test('Parse COUNT Aggregate Query', () => { - const query = 'SELECT COUNT(*) FROM student'; - const parsed = parseQuery(query); - expect(parsed).toEqual({ - fields: ['COUNT(*)'], - table: 'student', - whereClauses: [], - groupByFields: null, - hasAggregateWithoutGroupBy: true, - "joinCondition": null, - "joinTable": null, - "joinType": null, - "orderByFields": null, - "limit": null, - isDistinct: false - }); -}); - - -test('Parse SUM Aggregate Query', () => { - const query = 'SELECT SUM(age) FROM student'; - const parsed = parseQuery(query); - expect(parsed).toEqual({ - fields: ['SUM(age)'], - table: 'student', - whereClauses: [], - groupByFields: null, - hasAggregateWithoutGroupBy: true, - "joinCondition": null, - "joinTable": null, - "joinType": null, - "orderByFields": null, - "limit": null, - isDistinct: false - }); -}); - -test('Parse AVG Aggregate Query', () => { - const query = 'SELECT AVG(age) FROM student'; - const parsed = parseQuery(query); - expect(parsed).toEqual({ - fields: ['AVG(age)'], - table: 'student', - whereClauses: [], - groupByFields: null, - hasAggregateWithoutGroupBy: true, - "joinCondition": null, - "joinTable": null, - "joinType": null, - "orderByFields": null, - "limit": null, - isDistinct: false - }); -}); - -test('Parse MIN Aggregate Query', () => { - const query = 'SELECT MIN(age) FROM student'; - const parsed = parseQuery(query); - expect(parsed).toEqual({ - fields: ['MIN(age)'], - table: 'student', - whereClauses: [], - groupByFields: null, - hasAggregateWithoutGroupBy: true, - "joinCondition": null, - "joinTable": null, - "joinType": null, - "orderByFields": null, - "limit": null, - isDistinct: false - }); -}); - -test('Parse MAX Aggregate Query', () => { - const query = 'SELECT MAX(age) FROM student'; - const parsed = parseQuery(query); - expect(parsed).toEqual({ - fields: ['MAX(age)'], - table: 'student', - whereClauses: [], - groupByFields: null, - hasAggregateWithoutGroupBy: true, - "joinCondition": null, - "joinTable": null, - "joinType": null, - "orderByFields": null, - "limit": null, - isDistinct: false - }); -}); - -test('Parse basic GROUP BY query', () => { - const query = 'SELECT age, COUNT(*) FROM student GROUP BY age'; - const parsed = parseQuery(query); - expect(parsed).toEqual({ - fields: ['age', 'COUNT(*)'], - table: 'student', - whereClauses: [], - groupByFields: ['age'], - joinType: null, - joinTable: null, - joinCondition: null, - hasAggregateWithoutGroupBy: false, - orderByFields: null, - "limit": null, - isDistinct: false - }); -}); - -test('Parse GROUP BY query with WHERE clause', () => { - const query = 'SELECT age, COUNT(*) FROM student WHERE age > 22 GROUP BY age'; - const parsed = parseQuery(query); - expect(parsed).toEqual({ - fields: ['age', 'COUNT(*)'], - table: 'student', - whereClauses: [{ field: 'age', operator: '>', value: '22' }], - groupByFields: ['age'], - joinType: null, - joinTable: null, - joinCondition: null, - hasAggregateWithoutGroupBy: false, - orderByFields: null, - "limit": null, - isDistinct: false - }); -}); - -test('Parse GROUP BY query with multiple fields', () => { - const query = 'SELECT student_id, course, COUNT(*) FROM enrollment GROUP BY student_id, course'; - const parsed = parseQuery(query); - expect(parsed).toEqual({ - fields: ['student_id', 'course', 'COUNT(*)'], - table: 'enrollment', - whereClauses: [], - groupByFields: ['student_id', 'course'], - joinType: null, - joinTable: null, - joinCondition: null, - hasAggregateWithoutGroupBy: false, - orderByFields: null, - "limit": null, - isDistinct: false - }); -}); - -test('Parse GROUP BY query with JOIN and WHERE clauses', () => { - const query = 'SELECT student.name, COUNT(*) FROM student INNER JOIN enrollment ON student.id = enrollment.student_id WHERE enrollment.course = "Mathematics" GROUP BY student.name'; - const parsed = parseQuery(query); - expect(parsed).toEqual({ - fields: ['student.name', 'COUNT(*)'], - table: 'student', - whereClauses: [{ field: 'enrollment.course', operator: '=', value: '"Mathematics"' }], - groupByFields: ['student.name'], - joinType: 'INNER', - joinTable: 'enrollment', - joinCondition: { - left: 'student.id', - right: 'enrollment.student_id' - }, - hasAggregateWithoutGroupBy: false, - orderByFields: null, - "limit": null, - isDistinct: false, - }); -}); - -test('Execute SQL Query with ORDER BY', async () => { - const query = 'SELECT name FROM student ORDER BY name ASC'; - const result = await executeSELECTQuery(query); - - expect(result).toStrictEqual([ - { name: 'Alice' }, - { name: 'Bob' }, - { name: 'Jane' }, - { name: 'John' } - ]); -}); - -test('Execute SQL Query with ORDER BY and WHERE', async () => { - const query = 'SELECT name FROM student WHERE age > 24 ORDER BY name DESC'; - const result = await executeSELECTQuery(query); - - expect(result).toStrictEqual([ - { name: 'John' }, - { name: 'Jane' }, - ]); -}); -test('Execute SQL Query with ORDER BY and GROUP BY', async () => { - const query = 'SELECT COUNT(id) as count, age FROM student GROUP BY age ORDER BY age DESC'; - const result = await executeSELECTQuery(query); - - expect(result).toStrictEqual([ - { age: '30', 'COUNT(id) as count': 1 }, - { age: '25', 'COUNT(id) as count': 1 }, - { age: '24', 'COUNT(id) as count': 1 }, - { age: '22', 'COUNT(id) as count': 1 } - ]); -}); - -test('Execute SQL Query with standard LIMIT clause', async () => { - const query = 'SELECT id, name FROM student LIMIT 2'; - const result = await executeSELECTQuery(query); - expect(result.length).toEqual(2); -}); - -test('Execute SQL Query with LIMIT clause equal to total rows', async () => { - const query = 'SELECT id, name FROM student LIMIT 4'; - const result = await executeSELECTQuery(query); - expect(result.length).toEqual(4); -}); - -test('Execute SQL Query with LIMIT clause exceeding total rows', async () => { - const query = 'SELECT id, name FROM student LIMIT 10'; - const result = await executeSELECTQuery(query); - expect(result.length).toEqual(4); // Total rows in student.csv -}); - -test('Execute SQL Query with LIMIT 0', async () => { - const query = 'SELECT id, name FROM student LIMIT 0'; - const result = await executeSELECTQuery(query); - expect(result.length).toEqual(0); -}); - -test('Execute SQL Query with LIMIT and ORDER BY clause', async () => { - const query = 'SELECT id, name FROM student ORDER BY age DESC LIMIT 2'; - const result = await executeSELECTQuery(query); - expect(result.length).toEqual(2); - expect(result[0].name).toEqual('John'); - expect(result[1].name).toEqual('Jane'); -}); - -test('Error Handling with Malformed Query', async () => { - const query = 'SELECT FROM table'; // intentionally malformed - await expect(executeSELECTQuery(query)).rejects.toThrow("Error executing query: Query parsing error: Invalid SELECT format"); -}); - -test('Basic DISTINCT Usage', async () => { - const query = 'SELECT DISTINCT age FROM student'; - const result = await executeSELECTQuery(query); - expect(result).toEqual([{ age: '30' }, { age: '25' }, { age: '22' }, { age: '24' }]); -}); - -test('DISTINCT with Multiple Columns', async () => { - const query = 'SELECT DISTINCT student_id, course FROM enrollment'; - const result = await executeSELECTQuery(query); - // Expecting unique combinations of student_id and course - expect(result).toEqual([ - { student_id: '1', course: 'Mathematics' }, - { student_id: '1', course: 'Physics' }, - { student_id: '2', course: 'Chemistry' }, - { student_id: '3', course: 'Mathematics' }, - { student_id: '5', course: 'Biology' }, - ]); +test("DISTINCT with WHERE Clause", async () => { + const query = 'SELECT DISTINCT course FROM enrollment WHERE student_id = "1"'; + const result = await executeSELECTQuery(query); + expect(result).toEqual([{ course: "Mathematics" }, { course: "Physics" }]); }); -// Not a good test right now -test('DISTINCT with WHERE Clause', async () => { - const query = 'SELECT DISTINCT course FROM enrollment WHERE student_id = "1"'; - const result = await executeSELECTQuery(query); - // Expecting courses taken by student with ID 1 - expect(result).toEqual([{ course: 'Mathematics' }, { course: 'Physics' }]); +test("DISTINCT with JOIN Operations", async () => { + const query = + "SELECT DISTINCT student.name FROM student INNER JOIN enrollment ON student.id = enrollment.student_id"; + const result = await executeSELECTQuery(query); + expect(result).toEqual([ + { "student.name": "John" }, + { "student.name": "Jane" }, + { "student.name": "Bob" }, + ]); }); -test('DISTINCT with JOIN Operations', async () => { - const query = 'SELECT DISTINCT student.name FROM student INNER JOIN enrollment ON student.id = enrollment.student_id'; - const result = await executeSELECTQuery(query); - // Expecting names of students who are enrolled in any course - expect(result).toEqual([{ "student.name": 'John' }, { "student.name": 'Jane' }, { "student.name": 'Bob' }]); +test("DISTINCT with ORDER BY and LIMIT", async () => { + const query = "SELECT DISTINCT age FROM student ORDER BY age DESC LIMIT 2"; + const result = await executeSELECTQuery(query); + expect(result).toEqual([{ age: "30" }, { age: "25" }]); }); - -test('DISTINCT with ORDER BY and LIMIT', async () => { - const query = 'SELECT DISTINCT age FROM student ORDER BY age DESC LIMIT 2'; - const result = await executeSELECTQuery(query); - // Expecting the two highest unique ages - expect(result).toEqual([{ age: '30' }, { age: '25' }]); -}); \ No newline at end of file diff --git a/tests/step-15/index.test.js b/tests/step-15/index.test.js index a2aa4daee..fd82c6596 100644 --- a/tests/step-15/index.test.js +++ b/tests/step-15/index.test.js @@ -1,59 +1,60 @@ -const readCSV = require('../../src/csvReader'); -const {parseQuery, parseJoinClause} = require('../../src/queryParser'); -const executeSELECTQuery = require('../../src/index'); - -test('Read CSV File', async () => { - const data = await readCSV('./student.csv'); - expect(data.length).toBeGreaterThan(0); - expect(data.length).toBe(4); - expect(data[0].name).toBe('John'); - expect(data[0].age).toBe('30'); //ignore the string type here, we will fix this later -}); - -test('Execute SQL Query', async () => { - const query = 'SELECT id, name FROM student'; - const result = await executeSELECTQuery(query); - expect(result.length).toBeGreaterThan(0); - expect(result[0]).toHaveProperty('id'); - expect(result[0]).toHaveProperty('name'); - expect(result[0]).not.toHaveProperty('age'); - expect(result[0]).toEqual({ id: '1', name: 'John' }); -}); - -test('Execute SQL Query with WHERE Clause', async () => { - const query = 'SELECT id, name FROM student WHERE age = 25'; - const result = await executeSELECTQuery(query); - expect(result.length).toBe(1); - expect(result[0]).toHaveProperty('id'); - expect(result[0]).toHaveProperty('name'); - expect(result[0].id).toBe('2'); -}); - -test('Execute SQL Query with Complex WHERE Clause', async () => { - const query = 'SELECT id, name FROM student WHERE age = 30 AND name = John'; - const result = await executeSELECTQuery(query); - expect(result.length).toBe(1); - expect(result[0]).toEqual({ id: '1', name: 'John' }); -}); - -test('Execute SQL Query with Greater Than', async () => { - const queryWithGT = 'SELECT id FROM student WHERE age > 22'; - const result = await executeSELECTQuery(queryWithGT); - expect(result.length).toEqual(3); - expect(result[0]).toHaveProperty('id'); -}); - -test('Execute SQL Query with Not Equal to', async () => { - const queryWithGT = 'SELECT name FROM student WHERE age != 25'; - const result = await executeSELECTQuery(queryWithGT); - expect(result.length).toEqual(3); - expect(result[0]).toHaveProperty('name'); -}); - -test('Execute SQL Query with INNER JOIN', async () => { - const query = 'SELECT student.name, enrollment.course FROM student INNER JOIN enrollment ON student.id=enrollment.student_id'; - const result = await executeSELECTQuery(query); - /* +const { readCSV } = require("../../src/csvReader"); +const { parseSelectQuery, parseJoinClause } = require("../../src/queryParser"); +const { executeSELECTQuery } = require("../../src/queryExecutor"); + +test("Read CSV File", async () => { + const data = await readCSV("./student.csv"); + expect(data.length).toBeGreaterThan(0); + expect(data.length).toBe(4); + expect(data[0].name).toBe("John"); + expect(data[0].age).toBe("30"); //ignore the string type here, we will fix this later +}); + +test("Execute SQL Query", async () => { + const query = "SELECT id, name FROM student"; + const result = await executeSELECTQuery(query); + expect(result.length).toBeGreaterThan(0); + expect(result[0]).toHaveProperty("id"); + expect(result[0]).toHaveProperty("name"); + expect(result[0]).not.toHaveProperty("age"); + expect(result[0]).toEqual({ id: "1", name: "John" }); +}); + +test("Execute SQL Query with WHERE Clause", async () => { + const query = "SELECT id, name FROM student WHERE age = 25"; + const result = await executeSELECTQuery(query); + expect(result.length).toBe(1); + expect(result[0]).toHaveProperty("id"); + expect(result[0]).toHaveProperty("name"); + expect(result[0].id).toBe("2"); +}); + +test("Execute SQL Query with Complex WHERE Clause", async () => { + const query = "SELECT id, name FROM student WHERE age = 30 AND name = John"; + const result = await executeSELECTQuery(query); + expect(result.length).toBe(1); + expect(result[0]).toEqual({ id: "1", name: "John" }); +}); + +test("Execute SQL Query with Greater Than", async () => { + const queryWithGT = "SELECT id FROM student WHERE age > 22"; + const result = await executeSELECTQuery(queryWithGT); + expect(result.length).toEqual(3); + expect(result[0]).toHaveProperty("id"); +}); + +test("Execute SQL Query with Not Equal to", async () => { + const queryWithGT = "SELECT name FROM student WHERE age != 25"; + const result = await executeSELECTQuery(queryWithGT); + expect(result.length).toEqual(3); + expect(result[0]).toHaveProperty("name"); +}); + +test("Execute SQL Query with INNER JOIN", async () => { + const query = + "SELECT student.name, enrollment.course FROM student INNER JOIN enrollment ON student.id=enrollment.student_id"; + const result = await executeSELECTQuery(query); + /* result = [ { 'student.name': 'John', 'enrollment.course': 'Mathematics' }, { 'student.name': 'John', 'enrollment.course': 'Physics' }, @@ -61,762 +62,834 @@ test('Execute SQL Query with INNER JOIN', async () => { { 'student.name': 'Bob', 'enrollment.course': 'Mathematics' } ] */ - expect(result.length).toEqual(4); - // toHaveProperty is not working here due to dot in the property name - expect(result[0]).toEqual(expect.objectContaining({ - "enrollment.course": "Mathematics", - "student.name": "John" - })); + expect(result.length).toEqual(4); + // toHaveProperty is not working here due to dot in the property name + expect(result[0]).toEqual( + expect.objectContaining({ + "enrollment.course": "Mathematics", + "student.name": "John", + }) + ); }); -test('Execute SQL Query with INNER JOIN and a WHERE Clause', async () => { - const query = 'SELECT student.name, enrollment.course, student.age FROM student INNER JOIN enrollment ON student.id = enrollment.student_id WHERE student.age > 25'; - const result = await executeSELECTQuery(query); - /* +test("Execute SQL Query with INNER JOIN and a WHERE Clause", async () => { + const query = + "SELECT student.name, enrollment.course, student.age FROM student INNER JOIN enrollment ON student.id = enrollment.student_id WHERE student.age > 25"; + const result = await executeSELECTQuery(query); + /* result = [ { 'student.name': 'John', - 'enrollment.course': 'Mathematics', - 'student.age': '30' - }, - { - 'student.name': 'John', - 'enrollment.course': 'Physics', - 'student.age': '30' + @@ -86,737 +90,812 @@ test('Execute SQL Query with INNER JOIN and a WHERE Clause', async () => { } ] */ - expect(result.length).toEqual(2); - // toHaveProperty is not working here due to dot in the property name - expect(result[0]).toEqual(expect.objectContaining({ - "enrollment.course": "Mathematics", - "student.name": "John" - })); -}); - -test('Execute SQL Query with LEFT JOIN', async () => { - const query = 'SELECT student.name, enrollment.course FROM student LEFT JOIN enrollment ON student.id=enrollment.student_id'; - const result = await executeSELECTQuery(query); - expect(result).toEqual(expect.arrayContaining([ - expect.objectContaining({ "student.name": "Alice", "enrollment.course": null }), - expect.objectContaining({ "student.name": "John", "enrollment.course": "Mathematics" }) - ])); - expect(result.length).toEqual(5); // 4 students, but John appears twice -}); - -test('Execute SQL Query with RIGHT JOIN', async () => { - const query = 'SELECT student.name, enrollment.course FROM student RIGHT JOIN enrollment ON student.id=enrollment.student_id'; - const result = await executeSELECTQuery(query); - expect(result).toEqual(expect.arrayContaining([ - expect.objectContaining({ "student.name": null, "enrollment.course": "Biology" }), - expect.objectContaining({ "student.name": "John", "enrollment.course": "Mathematics" }) - ])); - expect(result.length).toEqual(5); // 4 courses, but Mathematics appears twice -}); - -test('Execute SQL Query with LEFT JOIN with a WHERE clause filtering the main table', async () => { - const query = 'SELECT student.name, enrollment.course FROM student LEFT JOIN enrollment ON student.id=enrollment.student_id WHERE student.age > 22'; - const result = await executeSELECTQuery(query); - expect(result).toEqual(expect.arrayContaining([ - expect.objectContaining({ "enrollment.course": "Mathematics", "student.name": "John" }), - expect.objectContaining({ "enrollment.course": "Physics", "student.name": "John" }) - ])); - expect(result.length).toEqual(4); -}); - -test('Execute SQL Query with LEFT JOIN with a WHERE clause filtering the join table', async () => { - const query = `SELECT student.name, enrollment.course FROM student LEFT JOIN enrollment ON student.id=enrollment.student_id WHERE enrollment.course = 'Physics'`; - const result = await executeSELECTQuery(query); - expect(result).toEqual(expect.arrayContaining([ - expect.objectContaining({ "student.name": "John", "enrollment.course": "Physics" }) - ])); - expect(result.length).toEqual(1); -}); - -test('Execute SQL Query with RIGHT JOIN with a WHERE clause filtering the main table', async () => { - const query = 'SELECT student.name, enrollment.course FROM student RIGHT JOIN enrollment ON student.id=enrollment.student_id WHERE student.age < 25'; - const result = await executeSELECTQuery(query); - expect(result).toEqual(expect.arrayContaining([ - expect.objectContaining({ "enrollment.course": "Mathematics", "student.name": "Bob" }), - expect.objectContaining({ "enrollment.course": "Biology", "student.name": null }) - ])); - expect(result.length).toEqual(2); -}); - -test('Execute SQL Query with RIGHT JOIN with a WHERE clause filtering the join table', async () => { - const query = `SELECT student.name, enrollment.course FROM student RIGHT JOIN enrollment ON student.id=enrollment.student_id WHERE enrollment.course = 'Chemistry'`; - const result = await executeSELECTQuery(query); - expect(result).toEqual(expect.arrayContaining([ - expect.objectContaining({ "enrollment.course": "Chemistry", "student.name": "Jane" }), - ])); - expect(result.length).toEqual(1); -}); - -test('Execute SQL Query with RIGHT JOIN with a multiple WHERE clauses filtering the join table and main table', async () => { - const query = `SELECT student.name, enrollment.course FROM student RIGHT JOIN enrollment ON student.id=enrollment.student_id WHERE enrollment.course = 'Chemistry' AND student.age = 26`; - const result = await executeSELECTQuery(query); - expect(result).toEqual([]); -}); - -test('Execute COUNT Aggregate Query', async () => { - const query = 'SELECT COUNT(*) FROM student'; - const result = await executeSELECTQuery(query); - expect(result).toEqual([{ 'COUNT(*)': 4 }]); -}); - -test('Execute SUM Aggregate Query', async () => { - const query = 'SELECT SUM(age) FROM student'; - const result = await executeSELECTQuery(query); - expect(result).toEqual([{ 'SUM(age)': 101 }]); -}); - -test('Execute AVG Aggregate Query', async () => { - const query = 'SELECT AVG(age) FROM student'; - const result = await executeSELECTQuery(query); - // Assuming AVG returns a single decimal point value - expect(result).toEqual([{ 'AVG(age)': 25.25 }]); -}); - -test('Execute MIN Aggregate Query', async () => { - const query = 'SELECT MIN(age) FROM student'; - const result = await executeSELECTQuery(query); - expect(result).toEqual([{ 'MIN(age)': 22 }]); -}); - -test('Execute MAX Aggregate Query', async () => { - const query = 'SELECT MAX(age) FROM student'; - const result = await executeSELECTQuery(query); - expect(result).toEqual([{ 'MAX(age)': 30 }]); -}); - -test('Count students per age', async () => { - const query = 'SELECT age, COUNT(*) FROM student GROUP BY age'; - const result = await executeSELECTQuery(query); - expect(result).toEqual([ - { age: '22', 'COUNT(*)': 1 }, - { age: '24', 'COUNT(*)': 1 }, - { age: '25', 'COUNT(*)': 1 }, - { age: '30', 'COUNT(*)': 1 } - ]); -}); - -test('Count enrollments per course', async () => { - const query = 'SELECT course, COUNT(*) FROM enrollment GROUP BY course'; - const result = await executeSELECTQuery(query); - expect(result).toEqual([ - { course: 'Mathematics', 'COUNT(*)': 2 }, - { course: 'Physics', 'COUNT(*)': 1 }, - { course: 'Chemistry', 'COUNT(*)': 1 }, - { course: 'Biology', 'COUNT(*)': 1 } - ]); -}); - - -test('Count courses per student', async () => { - const query = 'SELECT student_id, COUNT(*) FROM enrollment GROUP BY student_id'; - const result = await executeSELECTQuery(query); - expect(result).toEqual([ - { student_id: '1', 'COUNT(*)': 2 }, - { student_id: '2', 'COUNT(*)': 1 }, - { student_id: '3', 'COUNT(*)': 1 }, - { student_id: '5', 'COUNT(*)': 1 } - ]); -}); - -test('Count students within a specific age range', async () => { - const query = 'SELECT age, COUNT(*) FROM student WHERE age > 22 GROUP BY age'; - const result = await executeSELECTQuery(query); - expect(result).toEqual([ - { age: '24', 'COUNT(*)': 1 }, - { age: '25', 'COUNT(*)': 1 }, - { age: '30', 'COUNT(*)': 1 } - ]); -}); - -test('Count enrollments for a specific course', async () => { - const query = 'SELECT course, COUNT(*) FROM enrollment WHERE course = "Mathematics" GROUP BY course'; - const result = await executeSELECTQuery(query); - expect(result).toEqual([ - { course: 'Mathematics', 'COUNT(*)': 2 } - ]); -}); - -test('Count courses for a specific student', async () => { - const query = 'SELECT student_id, COUNT(*) FROM enrollment WHERE student_id = 1 GROUP BY student_id'; - const result = await executeSELECTQuery(query); - expect(result).toEqual([ - { student_id: '1', 'COUNT(*)': 2 } - ]); -}); - -test('Average age of students above a certain age', async () => { - const query = 'SELECT AVG(age) FROM student WHERE age > 22'; - const result = await executeSELECTQuery(query); - const expectedAverage = (25 + 30 + 24) / 3; // Average age of students older than 22 - expect(result).toEqual([{ 'AVG(age)': expectedAverage }]); -}); - -test('Parse SQL Query', () => { - const query = 'SELECT id, name FROM student'; - const parsed = parseQuery(query); - expect(parsed).toEqual({ - fields: ['id', 'name'], - table: 'student', - whereClauses: [], - joinCondition: null, - joinTable: null, - joinType: null, - groupByFields: null, - hasAggregateWithoutGroupBy: false, - "orderByFields": null, - "limit": null, - isDistinct: false - }); -}); - -test('Parse SQL Query with WHERE Clause', () => { - const query = 'SELECT id, name FROM student WHERE age = 25'; - const parsed = parseQuery(query); - expect(parsed).toEqual({ - fields: ['id', 'name'], - table: 'student', - whereClauses: [{ - "field": "age", - "operator": "=", - "value": "25", - }], - joinCondition: null, - joinTable: null, - joinType: null, - groupByFields: null, - hasAggregateWithoutGroupBy: false, - "orderByFields": null, - "limit": null, - isDistinct: false - }); -}); - -test('Parse SQL Query with Multiple WHERE Clauses', () => { - const query = 'SELECT id, name FROM student WHERE age = 30 AND name = John'; - const parsed = parseQuery(query); - expect(parsed).toEqual({ - fields: ['id', 'name'], - table: 'student', - whereClauses: [{ - "field": "age", - "operator": "=", - "value": "30", - }, { - "field": "name", - "operator": "=", - "value": "John", - }], - joinCondition: null, - joinTable: null, - joinType: null, - groupByFields: null, - hasAggregateWithoutGroupBy: false, - "orderByFields": null, - "limit": null, - isDistinct: false - }); -}); - -test('Parse SQL Query with INNER JOIN', async () => { - const query = 'SELECT student.name, enrollment.course FROM student INNER JOIN enrollment ON student.id=enrollment.student_id'; - const result = await parseQuery(query); - expect(result).toEqual({ - fields: ['student.name', 'enrollment.course'], - table: 'student', - whereClauses: [], - joinTable: 'enrollment', - joinType: "INNER", - joinCondition: { left: 'student.id', right: 'enrollment.student_id' }, - groupByFields: null, - hasAggregateWithoutGroupBy: false, - "orderByFields": null, - "limit": null, - isDistinct: false - }) -}); - -test('Parse SQL Query with INNER JOIN and WHERE Clause', async () => { - const query = 'SELECT student.name, enrollment.course FROM student INNER JOIN enrollment ON student.id = enrollment.student_id WHERE student.age > 20'; - const result = await parseQuery(query); - expect(result).toEqual({ - fields: ['student.name', 'enrollment.course'], - table: 'student', - whereClauses: [{ field: 'student.age', operator: '>', value: '20' }], - joinTable: 'enrollment', - joinType: "INNER", - joinCondition: { left: 'student.id', right: 'enrollment.student_id' }, - groupByFields: null, - hasAggregateWithoutGroupBy: false, - "orderByFields": null, - "limit": null, - isDistinct: false - }) -}); - -test('Parse INNER JOIN clause', () => { - const query = 'SELECT * FROM table1 INNER JOIN table2 ON table1.id = table2.ref_id'; - const result = parseJoinClause(query); - expect(result).toEqual({ - joinType: 'INNER', - joinTable: 'table2', - joinCondition: { left: 'table1.id', right: 'table2.ref_id' }, - }); -}); - -test('Parse LEFT JOIN clause', () => { - const query = 'SELECT * FROM table1 LEFT JOIN table2 ON table1.id = table2.ref_id'; - const result = parseJoinClause(query); - expect(result).toEqual({ - joinType: 'LEFT', - joinTable: 'table2', - joinCondition: { left: 'table1.id', right: 'table2.ref_id' } - }); -}); - -test('Parse RIGHT JOIN clause', () => { - const query = 'SELECT * FROM table1 RIGHT JOIN table2 ON table1.id = table2.ref_id'; - const result = parseJoinClause(query); - expect(result).toEqual({ - joinType: 'RIGHT', - joinTable: 'table2', - joinCondition: { left: 'table1.id', right: 'table2.ref_id' } - }); -}); - -test('Returns null for queries without JOIN', () => { - const query = 'SELECT * FROM table1'; - const result = parseJoinClause(query); - expect(result).toEqual( - { - joinType: null, - joinTable: null, - joinCondition: null - } - ); -}); - -test('Parse LEFT Join Query Completely', () => { - const query = 'SELECT student.name, enrollment.course FROM student LEFT JOIN enrollment ON student.id=enrollment.student_id'; - const result = parseQuery(query); - expect(result).toEqual({ - fields: ['student.name', 'enrollment.course'], - table: 'student', - whereClauses: [], - joinType: 'LEFT', - joinTable: 'enrollment', - joinCondition: { left: 'student.id', right: 'enrollment.student_id' }, - groupByFields: null, - hasAggregateWithoutGroupBy: false, - "orderByFields": null, - "limit": null, - isDistinct: false - }) -}) - -test('Parse LEFT Join Query Completely', () => { - const query = 'SELECT student.name, enrollment.course FROM student RIGHT JOIN enrollment ON student.id=enrollment.student_id'; - const result = parseQuery(query); - expect(result).toEqual({ - fields: ['student.name', 'enrollment.course'], - table: 'student', - whereClauses: [], - joinType: 'RIGHT', - joinTable: 'enrollment', - joinCondition: { left: 'student.id', right: 'enrollment.student_id' }, - groupByFields: null, - hasAggregateWithoutGroupBy: false, - "orderByFields": null, - "limit": null, - isDistinct: false + expect(result.length).toEqual(2); + // toHaveProperty is not working here due to dot in the property name + expect(result[0]).toEqual( + expect.objectContaining({ + "enrollment.course": "Mathematics", + "student.name": "John", }) -}) - -test('Parse SQL Query with LEFT JOIN with a WHERE clause filtering the main table', async () => { - const query = 'SELECT student.name, enrollment.course FROM student LEFT JOIN enrollment ON student.id=enrollment.student_id WHERE student.age > 22'; - const result = await parseQuery(query); - expect(result).toEqual({ - "fields": ["student.name", "enrollment.course"], - "joinCondition": { "left": "student.id", "right": "enrollment.student_id" }, - "joinTable": "enrollment", - "joinType": "LEFT", - "table": "student", - "whereClauses": [{ "field": "student.age", "operator": ">", "value": "22" }], - groupByFields: null, - hasAggregateWithoutGroupBy: false, - "orderByFields": null, - "limit": null, - isDistinct: false - }); -}); - -test('Parse SQL Query with LEFT JOIN with a WHERE clause filtering the join table', async () => { - const query = `SELECT student.name, enrollment.course FROM student LEFT JOIN enrollment ON student.id=enrollment.student_id WHERE enrollment.course = 'Physics'`; - const result = await parseQuery(query); - expect(result).toEqual({ - "fields": ["student.name", "enrollment.course"], - "joinCondition": { "left": "student.id", "right": "enrollment.student_id" }, - "joinTable": "enrollment", - "joinType": "LEFT", - "table": "student", - "whereClauses": [{ "field": "enrollment.course", "operator": "=", "value": "'Physics'" }], - groupByFields: null, - hasAggregateWithoutGroupBy: false, - "orderByFields": null, - "limit": null, - isDistinct: false - }); -}); - -test('Parse SQL Query with RIGHT JOIN with a WHERE clause filtering the main table', async () => { - const query = 'SELECT student.name, enrollment.course FROM student RIGHT JOIN enrollment ON student.id=enrollment.student_id WHERE student.age < 25'; - const result = await parseQuery(query); - expect(result).toEqual({ - "fields": ["student.name", "enrollment.course"], - "joinCondition": { "left": "student.id", "right": "enrollment.student_id" }, - "joinTable": "enrollment", - "joinType": "RIGHT", - "table": "student", - "whereClauses": [{ "field": "student.age", "operator": "<", "value": "25" }], - groupByFields: null, - hasAggregateWithoutGroupBy: false, - "orderByFields": null, - "limit": null, - isDistinct: false - }); -}); - -test('Parse SQL Query with RIGHT JOIN with a WHERE clause filtering the join table', async () => { - const query = `SELECT student.name, enrollment.course FROM student RIGHT JOIN enrollment ON student.id=enrollment.student_id WHERE enrollment.course = 'Chemistry'`; - const result = await parseQuery(query); - expect(result).toEqual({ - "fields": ["student.name", "enrollment.course"], - "joinCondition": { "left": "student.id", "right": "enrollment.student_id" }, - "joinTable": "enrollment", - "joinType": "RIGHT", - "table": "student", - "whereClauses": [{ "field": "enrollment.course", "operator": "=", "value": "'Chemistry'" }], - groupByFields: null, - hasAggregateWithoutGroupBy: false, - "orderByFields": null, - "limit": null, - isDistinct: false - }); -}); - - -test('Parse COUNT Aggregate Query', () => { - const query = 'SELECT COUNT(*) FROM student'; - const parsed = parseQuery(query); - expect(parsed).toEqual({ - fields: ['COUNT(*)'], - table: 'student', - whereClauses: [], - groupByFields: null, - hasAggregateWithoutGroupBy: true, - "joinCondition": null, - "joinTable": null, - "joinType": null, - "orderByFields": null, - "limit": null, - isDistinct: false - }); -}); - - -test('Parse SUM Aggregate Query', () => { - const query = 'SELECT SUM(age) FROM student'; - const parsed = parseQuery(query); - expect(parsed).toEqual({ - fields: ['SUM(age)'], - table: 'student', - whereClauses: [], - groupByFields: null, - hasAggregateWithoutGroupBy: true, - "joinCondition": null, - "joinTable": null, - "joinType": null, - "orderByFields": null, - "limit": null, - isDistinct: false - }); -}); - -test('Parse AVG Aggregate Query', () => { - const query = 'SELECT AVG(age) FROM student'; - const parsed = parseQuery(query); - expect(parsed).toEqual({ - fields: ['AVG(age)'], - table: 'student', - whereClauses: [], - groupByFields: null, - hasAggregateWithoutGroupBy: true, - "joinCondition": null, - "joinTable": null, - "joinType": null, - "orderByFields": null, - "limit": null, - isDistinct: false - }); -}); - -test('Parse MIN Aggregate Query', () => { - const query = 'SELECT MIN(age) FROM student'; - const parsed = parseQuery(query); - expect(parsed).toEqual({ - fields: ['MIN(age)'], - table: 'student', - whereClauses: [], - groupByFields: null, - hasAggregateWithoutGroupBy: true, - "joinCondition": null, - "joinTable": null, - "joinType": null, - "orderByFields": null, - "limit": null, - isDistinct: false - }); -}); - -test('Parse MAX Aggregate Query', () => { - const query = 'SELECT MAX(age) FROM student'; - const parsed = parseQuery(query); - expect(parsed).toEqual({ - fields: ['MAX(age)'], - table: 'student', - whereClauses: [], - groupByFields: null, - hasAggregateWithoutGroupBy: true, - "joinCondition": null, - "joinTable": null, - "joinType": null, - "orderByFields": null, - "limit": null, - isDistinct: false - }); -}); - -test('Parse basic GROUP BY query', () => { - const query = 'SELECT age, COUNT(*) FROM student GROUP BY age'; - const parsed = parseQuery(query); - expect(parsed).toEqual({ - fields: ['age', 'COUNT(*)'], - table: 'student', - whereClauses: [], - groupByFields: ['age'], - joinType: null, - joinTable: null, - joinCondition: null, - hasAggregateWithoutGroupBy: false, - orderByFields: null, - "limit": null, - isDistinct: false - }); -}); - -test('Parse GROUP BY query with WHERE clause', () => { - const query = 'SELECT age, COUNT(*) FROM student WHERE age > 22 GROUP BY age'; - const parsed = parseQuery(query); - expect(parsed).toEqual({ - fields: ['age', 'COUNT(*)'], - table: 'student', - whereClauses: [{ field: 'age', operator: '>', value: '22' }], - groupByFields: ['age'], - joinType: null, - joinTable: null, - joinCondition: null, - hasAggregateWithoutGroupBy: false, - orderByFields: null, - "limit": null, - isDistinct: false - }); -}); - -test('Parse GROUP BY query with multiple fields', () => { - const query = 'SELECT student_id, course, COUNT(*) FROM enrollment GROUP BY student_id, course'; - const parsed = parseQuery(query); - expect(parsed).toEqual({ - fields: ['student_id', 'course', 'COUNT(*)'], - table: 'enrollment', - whereClauses: [], - groupByFields: ['student_id', 'course'], - joinType: null, - joinTable: null, - joinCondition: null, - hasAggregateWithoutGroupBy: false, - orderByFields: null, - "limit": null, - isDistinct: false - }); -}); - -test('Parse GROUP BY query with JOIN and WHERE clauses', () => { - const query = 'SELECT student.name, COUNT(*) FROM student INNER JOIN enrollment ON student.id = enrollment.student_id WHERE enrollment.course = "Mathematics" GROUP BY student.name'; - const parsed = parseQuery(query); - expect(parsed).toEqual({ - fields: ['student.name', 'COUNT(*)'], - table: 'student', - whereClauses: [{ field: 'enrollment.course', operator: '=', value: '"Mathematics"' }], - groupByFields: ['student.name'], - joinType: 'INNER', - joinTable: 'enrollment', - joinCondition: { - left: 'student.id', - right: 'enrollment.student_id' - }, - hasAggregateWithoutGroupBy: false, - orderByFields: null, - "limit": null, - isDistinct: false, - }); -}); - -test('Execute SQL Query with ORDER BY', async () => { - const query = 'SELECT name FROM student ORDER BY name ASC'; - const result = await executeSELECTQuery(query); - - expect(result).toStrictEqual([ - { name: 'Alice' }, - { name: 'Bob' }, - { name: 'Jane' }, - { name: 'John' } - ]); -}); - -test('Execute SQL Query with ORDER BY and WHERE', async () => { - const query = 'SELECT name FROM student WHERE age > 24 ORDER BY name DESC'; - const result = await executeSELECTQuery(query); - - expect(result).toStrictEqual([ - { name: 'John' }, - { name: 'Jane' }, - ]); -}); -test('Execute SQL Query with ORDER BY and GROUP BY', async () => { - const query = 'SELECT COUNT(id) as count, age FROM student GROUP BY age ORDER BY age DESC'; - const result = await executeSELECTQuery(query); - - expect(result).toStrictEqual([ - { age: '30', 'COUNT(id) as count': 1 }, - { age: '25', 'COUNT(id) as count': 1 }, - { age: '24', 'COUNT(id) as count': 1 }, - { age: '22', 'COUNT(id) as count': 1 } - ]); -}); - -test('Execute SQL Query with standard LIMIT clause', async () => { - const query = 'SELECT id, name FROM student LIMIT 2'; - const result = await executeSELECTQuery(query); - expect(result.length).toEqual(2); -}); - -test('Execute SQL Query with LIMIT clause equal to total rows', async () => { - const query = 'SELECT id, name FROM student LIMIT 4'; - const result = await executeSELECTQuery(query); - expect(result.length).toEqual(4); -}); - -test('Execute SQL Query with LIMIT clause exceeding total rows', async () => { - const query = 'SELECT id, name FROM student LIMIT 10'; - const result = await executeSELECTQuery(query); - expect(result.length).toEqual(4); // Total rows in student.csv -}); - -test('Execute SQL Query with LIMIT 0', async () => { - const query = 'SELECT id, name FROM student LIMIT 0'; - const result = await executeSELECTQuery(query); - expect(result.length).toEqual(0); -}); - -test('Execute SQL Query with LIMIT and ORDER BY clause', async () => { - const query = 'SELECT id, name FROM student ORDER BY age DESC LIMIT 2'; - const result = await executeSELECTQuery(query); - expect(result.length).toEqual(2); - expect(result[0].name).toEqual('John'); - expect(result[1].name).toEqual('Jane'); -}); - -test('Error Handling with Malformed Query', async () => { - const query = 'SELECT FROM table'; // intentionally malformed - await expect(executeSELECTQuery(query)).rejects.toThrow("Error executing query: Query parsing error: Invalid SELECT format"); -}); - -test('Basic DISTINCT Usage', async () => { - const query = 'SELECT DISTINCT age FROM student'; - const result = await executeSELECTQuery(query); - expect(result).toEqual([{ age: '30' }, { age: '25' }, { age: '22' }, { age: '24' }]); -}); - -test('DISTINCT with Multiple Columns', async () => { - const query = 'SELECT DISTINCT student_id, course FROM enrollment'; - const result = await executeSELECTQuery(query); - // Expecting unique combinations of student_id and course - expect(result).toEqual([ - { student_id: '1', course: 'Mathematics' }, - { student_id: '1', course: 'Physics' }, - { student_id: '2', course: 'Chemistry' }, - { student_id: '3', course: 'Mathematics' }, - { student_id: '5', course: 'Biology' }, - ]); + ); +}); + +test("Execute SQL Query with LEFT JOIN", async () => { + const query = + "SELECT student.name, enrollment.course FROM student LEFT JOIN enrollment ON student.id=enrollment.student_id"; + const result = await executeSELECTQuery(query); + expect(result).toEqual( + expect.arrayContaining([ + expect.objectContaining({ + "student.name": "Alice", + "enrollment.course": null, + }), + expect.objectContaining({ + "student.name": "John", + "enrollment.course": "Mathematics", + }), + ]) + ); + expect(result.length).toEqual(5); // 4 students, but John appears twice +}); + +test("Execute SQL Query with RIGHT JOIN", async () => { + const query = + "SELECT student.name, enrollment.course FROM student RIGHT JOIN enrollment ON student.id=enrollment.student_id"; + const result = await executeSELECTQuery(query); + expect(result).toEqual( + expect.arrayContaining([ + expect.objectContaining({ + "student.name": null, + "enrollment.course": "Biology", + }), + expect.objectContaining({ + "student.name": "John", + "enrollment.course": "Mathematics", + }), + ]) + ); + expect(result.length).toEqual(5); // 4 courses, but Mathematics appears twice +}); + +test("Execute SQL Query with LEFT JOIN with a WHERE clause filtering the main table", async () => { + const query = + "SELECT student.name, enrollment.course FROM student LEFT JOIN enrollment ON student.id=enrollment.student_id WHERE student.age > 22"; + const result = await executeSELECTQuery(query); + expect(result).toEqual( + expect.arrayContaining([ + expect.objectContaining({ + "enrollment.course": "Mathematics", + "student.name": "John", + }), + expect.objectContaining({ + "enrollment.course": "Physics", + "student.name": "John", + }), + ]) + ); + expect(result.length).toEqual(4); +}); + +test("Execute SQL Query with LEFT JOIN with a WHERE clause filtering the join table", async () => { + const query = `SELECT student.name, enrollment.course FROM student LEFT JOIN enrollment ON student.id=enrollment.student_id WHERE enrollment.course = 'Physics'`; + const result = await executeSELECTQuery(query); + expect(result).toEqual( + expect.arrayContaining([ + expect.objectContaining({ + "student.name": "John", + "enrollment.course": "Physics", + }), + ]) + ); + expect(result.length).toEqual(1); +}); + +test("Execute SQL Query with RIGHT JOIN with a WHERE clause filtering the main table", async () => { + const query = + "SELECT student.name, enrollment.course FROM student RIGHT JOIN enrollment ON student.id=enrollment.student_id WHERE student.age < 25"; + const result = await executeSELECTQuery(query); + expect(result).toEqual( + expect.arrayContaining([ + expect.objectContaining({ + "enrollment.course": "Mathematics", + "student.name": "Bob", + }), + expect.objectContaining({ + "enrollment.course": "Biology", + "student.name": null, + }), + ]) + ); + expect(result.length).toEqual(2); +}); + +test("Execute SQL Query with RIGHT JOIN with a WHERE clause filtering the join table", async () => { + const query = `SELECT student.name, enrollment.course FROM student RIGHT JOIN enrollment ON student.id=enrollment.student_id WHERE enrollment.course = 'Chemistry'`; + const result = await executeSELECTQuery(query); + expect(result).toEqual( + expect.arrayContaining([ + expect.objectContaining({ + "enrollment.course": "Chemistry", + "student.name": "Jane", + }), + ]) + ); + expect(result.length).toEqual(1); +}); + +test("Execute SQL Query with RIGHT JOIN with a multiple WHERE clauses filtering the join table and main table", async () => { + const query = `SELECT student.name, enrollment.course FROM student RIGHT JOIN enrollment ON student.id=enrollment.student_id WHERE enrollment.course = 'Chemistry' AND student.age = 26`; + const result = await executeSELECTQuery(query); + expect(result).toEqual([]); +}); + +test("Execute COUNT Aggregate Query", async () => { + const query = "SELECT COUNT(*) FROM student"; + const result = await executeSELECTQuery(query); + expect(result).toEqual([{ "COUNT(*)": 4 }]); +}); + +test("Execute SUM Aggregate Query", async () => { + const query = "SELECT SUM(age) FROM student"; + const result = await executeSELECTQuery(query); + expect(result).toEqual([{ "SUM(age)": 101 }]); +}); + +test("Execute AVG Aggregate Query", async () => { + const query = "SELECT AVG(age) FROM student"; + const result = await executeSELECTQuery(query); + // Assuming AVG returns a single decimal point value + expect(result).toEqual([{ "AVG(age)": 25.25 }]); +}); + +test("Execute MIN Aggregate Query", async () => { + const query = "SELECT MIN(age) FROM student"; + const result = await executeSELECTQuery(query); + expect(result).toEqual([{ "MIN(age)": 22 }]); +}); + +test("Execute MAX Aggregate Query", async () => { + const query = "SELECT MAX(age) FROM student"; + const result = await executeSELECTQuery(query); + expect(result).toEqual([{ "MAX(age)": 30 }]); +}); + +test("Count students per age", async () => { + const query = "SELECT age, COUNT(*) FROM student GROUP BY age"; + const result = await executeSELECTQuery(query); + expect(result).toEqual([ + { age: "22", "COUNT(*)": 1 }, + { age: "24", "COUNT(*)": 1 }, + { age: "25", "COUNT(*)": 1 }, + { age: "30", "COUNT(*)": 1 }, + ]); +}); + +test("Count enrollments per course", async () => { + const query = "SELECT course, COUNT(*) FROM enrollment GROUP BY course"; + const result = await executeSELECTQuery(query); + expect(result).toEqual([ + { course: "Mathematics", "COUNT(*)": 2 }, + { course: "Physics", "COUNT(*)": 1 }, + { course: "Chemistry", "COUNT(*)": 1 }, + { course: "Biology", "COUNT(*)": 1 }, + ]); +}); + +test("Count courses per student", async () => { + const query = + "SELECT student_id, COUNT(*) FROM enrollment GROUP BY student_id"; + const result = await executeSELECTQuery(query); + expect(result).toEqual([ + { student_id: "1", "COUNT(*)": 2 }, + { student_id: "2", "COUNT(*)": 1 }, + { student_id: "3", "COUNT(*)": 1 }, + { student_id: "5", "COUNT(*)": 1 }, + ]); +}); + +test("Count students within a specific age range", async () => { + const query = "SELECT age, COUNT(*) FROM student WHERE age > 22 GROUP BY age"; + const result = await executeSELECTQuery(query); + expect(result).toEqual([ + { age: "24", "COUNT(*)": 1 }, + { age: "25", "COUNT(*)": 1 }, + { age: "30", "COUNT(*)": 1 }, + ]); +}); + +test("Count enrollments for a specific course", async () => { + const query = + 'SELECT course, COUNT(*) FROM enrollment WHERE course = "Mathematics" GROUP BY course'; + const result = await executeSELECTQuery(query); + expect(result).toEqual([{ course: "Mathematics", "COUNT(*)": 2 }]); +}); + +test("Count courses for a specific student", async () => { + const query = + "SELECT student_id, COUNT(*) FROM enrollment WHERE student_id = 1 GROUP BY student_id"; + const result = await executeSELECTQuery(query); + expect(result).toEqual([{ student_id: "1", "COUNT(*)": 2 }]); +}); + +test("Average age of students above a certain age", async () => { + const query = "SELECT AVG(age) FROM student WHERE age > 22"; + const result = await executeSELECTQuery(query); + const expectedAverage = (25 + 30 + 24) / 3; // Average age of students older than 22 + expect(result).toEqual([{ "AVG(age)": expectedAverage }]); +}); + +test("Parse SQL Query", () => { + const query = "SELECT id, name FROM student"; + const parsed = parseSelectQuery(query); + expect(parsed).toEqual({ + fields: ["id", "name"], + table: "student", + whereClauses: [], + joinCondition: null, + joinTable: null, + joinType: null, + groupByFields: null, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse SQL Query with WHERE Clause", () => { + const query = "SELECT id, name FROM student WHERE age = 25"; + const parsed = parseSelectQuery(query); + expect(parsed).toEqual({ + fields: ["id", "name"], + table: "student", + whereClauses: [ + { + field: "age", + operator: "=", + value: "25", + }, + ], + joinCondition: null, + joinTable: null, + joinType: null, + groupByFields: null, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse SQL Query with Multiple WHERE Clauses", () => { + const query = "SELECT id, name FROM student WHERE age = 30 AND name = John"; + const parsed = parseSelectQuery(query); + expect(parsed).toEqual({ + fields: ["id", "name"], + table: "student", + whereClauses: [ + { + field: "age", + operator: "=", + value: "30", + }, + { + field: "name", + operator: "=", + value: "John", + }, + ], + joinCondition: null, + joinTable: null, + joinType: null, + groupByFields: null, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse SQL Query with INNER JOIN", async () => { + const query = + "SELECT student.name, enrollment.course FROM student INNER JOIN enrollment ON student.id=enrollment.student_id"; + const result = await parseSelectQuery(query); + expect(result).toEqual({ + fields: ["student.name", "enrollment.course"], + table: "student", + whereClauses: [], + joinTable: "enrollment", + joinType: "INNER", + joinCondition: { left: "student.id", right: "enrollment.student_id" }, + groupByFields: null, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse SQL Query with INNER JOIN and WHERE Clause", async () => { + const query = + "SELECT student.name, enrollment.course FROM student INNER JOIN enrollment ON student.id = enrollment.student_id WHERE student.age > 20"; + const result = await parseSelectQuery(query); + expect(result).toEqual({ + fields: ["student.name", "enrollment.course"], + table: "student", + whereClauses: [{ field: "student.age", operator: ">", value: "20" }], + joinTable: "enrollment", + joinType: "INNER", + joinCondition: { left: "student.id", right: "enrollment.student_id" }, + groupByFields: null, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse INNER JOIN clause", () => { + const query = + "SELECT * FROM table1 INNER JOIN table2 ON table1.id = table2.ref_id"; + const result = parseJoinClause(query); + expect(result).toEqual({ + joinType: "INNER", + joinTable: "table2", + joinCondition: { left: "table1.id", right: "table2.ref_id" }, + }); +}); + +test("Parse LEFT JOIN clause", () => { + const query = + "SELECT * FROM table1 LEFT JOIN table2 ON table1.id = table2.ref_id"; + const result = parseJoinClause(query); + expect(result).toEqual({ + joinType: "LEFT", + joinTable: "table2", + joinCondition: { left: "table1.id", right: "table2.ref_id" }, + }); +}); + +test("Parse RIGHT JOIN clause", () => { + const query = + "SELECT * FROM table1 RIGHT JOIN table2 ON table1.id = table2.ref_id"; + const result = parseJoinClause(query); + expect(result).toEqual({ + joinType: "RIGHT", + joinTable: "table2", + joinCondition: { left: "table1.id", right: "table2.ref_id" }, + }); +}); + +test("Returns null for queries without JOIN", () => { + const query = "SELECT * FROM table1"; + const result = parseJoinClause(query); + expect(result).toEqual({ + joinType: null, + joinTable: null, + joinCondition: null, + }); +}); + +test("Parse LEFT Join Query Completely", () => { + const query = + "SELECT student.name, enrollment.course FROM student LEFT JOIN enrollment ON student.id=enrollment.student_id"; + const result = parseSelectQuery(query); + expect(result).toEqual({ + fields: ["student.name", "enrollment.course"], + table: "student", + whereClauses: [], + joinType: "LEFT", + joinTable: "enrollment", + joinCondition: { left: "student.id", right: "enrollment.student_id" }, + groupByFields: null, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse LEFT Join Query Completely", () => { + const query = + "SELECT student.name, enrollment.course FROM student RIGHT JOIN enrollment ON student.id=enrollment.student_id"; + const result = parseSelectQuery(query); + expect(result).toEqual({ + fields: ["student.name", "enrollment.course"], + table: "student", + whereClauses: [], + joinType: "RIGHT", + joinTable: "enrollment", + joinCondition: { left: "student.id", right: "enrollment.student_id" }, + groupByFields: null, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse SQL Query with LEFT JOIN with a WHERE clause filtering the main table", async () => { + const query = + "SELECT student.name, enrollment.course FROM student LEFT JOIN enrollment ON student.id=enrollment.student_id WHERE student.age > 22"; + const result = await parseSelectQuery(query); + expect(result).toEqual({ + fields: ["student.name", "enrollment.course"], + joinCondition: { left: "student.id", right: "enrollment.student_id" }, + joinTable: "enrollment", + joinType: "LEFT", + table: "student", + whereClauses: [{ field: "student.age", operator: ">", value: "22" }], + groupByFields: null, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse SQL Query with LEFT JOIN with a WHERE clause filtering the join table", async () => { + const query = `SELECT student.name, enrollment.course FROM student LEFT JOIN enrollment ON student.id=enrollment.student_id WHERE enrollment.course = 'Physics'`; + const result = await parseSelectQuery(query); + expect(result).toEqual({ + fields: ["student.name", "enrollment.course"], + joinCondition: { left: "student.id", right: "enrollment.student_id" }, + joinTable: "enrollment", + joinType: "LEFT", + table: "student", + whereClauses: [ + { field: "enrollment.course", operator: "=", value: "'Physics'" }, + ], + groupByFields: null, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse SQL Query with RIGHT JOIN with a WHERE clause filtering the main table", async () => { + const query = + "SELECT student.name, enrollment.course FROM student RIGHT JOIN enrollment ON student.id=enrollment.student_id WHERE student.age < 25"; + const result = await parseSelectQuery(query); + expect(result).toEqual({ + fields: ["student.name", "enrollment.course"], + joinCondition: { left: "student.id", right: "enrollment.student_id" }, + joinTable: "enrollment", + joinType: "RIGHT", + table: "student", + whereClauses: [{ field: "student.age", operator: "<", value: "25" }], + groupByFields: null, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse SQL Query with RIGHT JOIN with a WHERE clause filtering the join table", async () => { + const query = `SELECT student.name, enrollment.course FROM student RIGHT JOIN enrollment ON student.id=enrollment.student_id WHERE enrollment.course = 'Chemistry'`; + const result = await parseSelectQuery(query); + expect(result).toEqual({ + fields: ["student.name", "enrollment.course"], + joinCondition: { left: "student.id", right: "enrollment.student_id" }, + joinTable: "enrollment", + joinType: "RIGHT", + table: "student", + whereClauses: [ + { field: "enrollment.course", operator: "=", value: "'Chemistry'" }, + ], + groupByFields: null, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse COUNT Aggregate Query", () => { + const query = "SELECT COUNT(*) FROM student"; + const parsed = parseSelectQuery(query); + expect(parsed).toEqual({ + fields: ["COUNT(*)"], + table: "student", + whereClauses: [], + groupByFields: null, + hasAggregateWithoutGroupBy: true, + joinCondition: null, + joinTable: null, + joinType: null, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse SUM Aggregate Query", () => { + const query = "SELECT SUM(age) FROM student"; + const parsed = parseSelectQuery(query); + expect(parsed).toEqual({ + fields: ["SUM(age)"], + table: "student", + whereClauses: [], + groupByFields: null, + hasAggregateWithoutGroupBy: true, + joinCondition: null, + joinTable: null, + joinType: null, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse AVG Aggregate Query", () => { + const query = "SELECT AVG(age) FROM student"; + const parsed = parseSelectQuery(query); + expect(parsed).toEqual({ + fields: ["AVG(age)"], + table: "student", + whereClauses: [], + groupByFields: null, + hasAggregateWithoutGroupBy: true, + joinCondition: null, + joinTable: null, + joinType: null, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse MIN Aggregate Query", () => { + const query = "SELECT MIN(age) FROM student"; + const parsed = parseSelectQuery(query); + expect(parsed).toEqual({ + fields: ["MIN(age)"], + table: "student", + whereClauses: [], + groupByFields: null, + hasAggregateWithoutGroupBy: true, + joinCondition: null, + joinTable: null, + joinType: null, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse MAX Aggregate Query", () => { + const query = "SELECT MAX(age) FROM student"; + const parsed = parseSelectQuery(query); + expect(parsed).toEqual({ + fields: ["MAX(age)"], + table: "student", + whereClauses: [], + groupByFields: null, + hasAggregateWithoutGroupBy: true, + joinCondition: null, + joinTable: null, + joinType: null, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse basic GROUP BY query", () => { + const query = "SELECT age, COUNT(*) FROM student GROUP BY age"; + const parsed = parseSelectQuery(query); + expect(parsed).toEqual({ + fields: ["age", "COUNT(*)"], + table: "student", + whereClauses: [], + groupByFields: ["age"], + joinType: null, + joinTable: null, + joinCondition: null, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse GROUP BY query with WHERE clause", () => { + const query = "SELECT age, COUNT(*) FROM student WHERE age > 22 GROUP BY age"; + const parsed = parseSelectQuery(query); + expect(parsed).toEqual({ + fields: ["age", "COUNT(*)"], + table: "student", + whereClauses: [{ field: "age", operator: ">", value: "22" }], + groupByFields: ["age"], + joinType: null, + joinTable: null, + joinCondition: null, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse GROUP BY query with multiple fields", () => { + const query = + "SELECT student_id, course, COUNT(*) FROM enrollment GROUP BY student_id, course"; + const parsed = parseSelectQuery(query); + expect(parsed).toEqual({ + fields: ["student_id", "course", "COUNT(*)"], + table: "enrollment", + whereClauses: [], + groupByFields: ["student_id", "course"], + joinType: null, + joinTable: null, + joinCondition: null, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse GROUP BY query with JOIN and WHERE clauses", () => { + const query = + 'SELECT student.name, COUNT(*) FROM student INNER JOIN enrollment ON student.id = enrollment.student_id WHERE enrollment.course = "Mathematics" GROUP BY student.name'; + const parsed = parseSelectQuery(query); + expect(parsed).toEqual({ + fields: ["student.name", "COUNT(*)"], + table: "student", + whereClauses: [ + { field: "enrollment.course", operator: "=", value: '"Mathematics"' }, + ], + groupByFields: ["student.name"], + joinType: "INNER", + joinTable: "enrollment", + joinCondition: { + left: "student.id", + right: "enrollment.student_id", + }, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Execute SQL Query with ORDER BY", async () => { + const query = "SELECT name FROM student ORDER BY name ASC"; + const result = await executeSELECTQuery(query); + + expect(result).toStrictEqual([ + { name: "Alice" }, + { name: "Bob" }, + { name: "Jane" }, + { name: "John" }, + ]); +}); + +test("Execute SQL Query with ORDER BY and WHERE", async () => { + const query = "SELECT name FROM student WHERE age > 24 ORDER BY name DESC"; + const result = await executeSELECTQuery(query); + + expect(result).toStrictEqual([{ name: "John" }, { name: "Jane" }]); +}); +test("Execute SQL Query with ORDER BY and GROUP BY", async () => { + const query = + "SELECT COUNT(id) as count, age FROM student GROUP BY age ORDER BY age DESC"; + const result = await executeSELECTQuery(query); + + expect(result).toStrictEqual([ + { age: "30", "COUNT(id) as count": 1 }, + { age: "25", "COUNT(id) as count": 1 }, + { age: "24", "COUNT(id) as count": 1 }, + { age: "22", "COUNT(id) as count": 1 }, + ]); +}); + +test("Execute SQL Query with standard LIMIT clause", async () => { + const query = "SELECT id, name FROM student LIMIT 2"; + const result = await executeSELECTQuery(query); + expect(result.length).toEqual(2); +}); + +test("Execute SQL Query with LIMIT clause equal to total rows", async () => { + const query = "SELECT id, name FROM student LIMIT 4"; + const result = await executeSELECTQuery(query); + expect(result.length).toEqual(4); +}); + +test("Execute SQL Query with LIMIT clause exceeding total rows", async () => { + const query = "SELECT id, name FROM student LIMIT 10"; + const result = await executeSELECTQuery(query); + expect(result.length).toEqual(4); // Total rows in student.csv +}); + +test("Execute SQL Query with LIMIT 0", async () => { + const query = "SELECT id, name FROM student LIMIT 0"; + const result = await executeSELECTQuery(query); + expect(result.length).toEqual(0); +}); + +test("Execute SQL Query with LIMIT and ORDER BY clause", async () => { + const query = "SELECT id, name FROM student ORDER BY age DESC LIMIT 2"; + const result = await executeSELECTQuery(query); + expect(result.length).toEqual(2); + expect(result[0].name).toEqual("John"); + expect(result[1].name).toEqual("Jane"); +}); + +test("Error Handling with Malformed Query", async () => { + const query = "SELECT FROM table"; // intentionally malformed + await expect(executeSELECTQuery(query)).rejects.toThrow( + "Error executing query: Query parsing error: Invalid SELECT format" + ); +}); + +test("Basic DISTINCT Usage", async () => { + const query = "SELECT DISTINCT age FROM student"; + const result = await executeSELECTQuery(query); + expect(result).toEqual([ + { age: "30" }, + { age: "25" }, + { age: "22" }, + { age: "24" }, + ]); +}); + +test("DISTINCT with Multiple Columns", async () => { + const query = "SELECT DISTINCT student_id, course FROM enrollment"; + const result = await executeSELECTQuery(query); + // Expecting unique combinations of student_id and course + expect(result).toEqual([ + { student_id: "1", course: "Mathematics" }, + { student_id: "1", course: "Physics" }, + { student_id: "2", course: "Chemistry" }, + { student_id: "3", course: "Mathematics" }, + { student_id: "5", course: "Biology" }, + ]); }); // Not a good test right now -test('DISTINCT with WHERE Clause', async () => { - const query = 'SELECT DISTINCT course FROM enrollment WHERE student_id = "1"'; - const result = await executeSELECTQuery(query); - // Expecting courses taken by student with ID 1 - expect(result).toEqual([{ course: 'Mathematics' }, { course: 'Physics' }]); +test("DISTINCT with WHERE Clause", async () => { + const query = 'SELECT DISTINCT course FROM enrollment WHERE student_id = "1"'; + const result = await executeSELECTQuery(query); + // Expecting courses taken by student with ID 1 + expect(result).toEqual([{ course: "Mathematics" }, { course: "Physics" }]); }); -test('DISTINCT with JOIN Operations', async () => { - const query = 'SELECT DISTINCT student.name FROM student INNER JOIN enrollment ON student.id = enrollment.student_id'; - const result = await executeSELECTQuery(query); - // Expecting names of students who are enrolled in any course - expect(result).toEqual([{ "student.name": 'John' }, { "student.name": 'Jane' }, { "student.name": 'Bob' }]); +test("DISTINCT with JOIN Operations", async () => { + const query = + "SELECT DISTINCT student.name FROM student INNER JOIN enrollment ON student.id = enrollment.student_id"; + const result = await executeSELECTQuery(query); + // Expecting names of students who are enrolled in any course + expect(result).toEqual([ + { "student.name": "John" }, + { "student.name": "Jane" }, + { "student.name": "Bob" }, + ]); }); -test('DISTINCT with ORDER BY and LIMIT', async () => { - const query = 'SELECT DISTINCT age FROM student ORDER BY age DESC LIMIT 2'; - const result = await executeSELECTQuery(query); - // Expecting the two highest unique ages - expect(result).toEqual([{ age: '30' }, { age: '25' }]); +test("DISTINCT with ORDER BY and LIMIT", async () => { + const query = "SELECT DISTINCT age FROM student ORDER BY age DESC LIMIT 2"; + const result = await executeSELECTQuery(query); + // Expecting the two highest unique ages + expect(result).toEqual([{ age: "30" }, { age: "25" }]); }); -test('Execute SQL Query with LIKE Operator for Name', async () => { - const query = "SELECT name FROM student WHERE name LIKE '%Jane%'"; - const result = await executeSELECTQuery(query); - // Expecting names containing 'Jane' - expect(result).toEqual([{ name: 'Jane' }]); +test("Execute SQL Query with LIKE Operator for Name", async () => { + const query = "SELECT name FROM student WHERE name LIKE '%Jane%'"; + const result = await executeSELECTQuery(query); + // Expecting names containing 'Jane' + expect(result).toEqual([{ name: "Jane" }]); }); -test('Execute SQL Query with LIKE Operator and Wildcards', async () => { - const query = "SELECT name FROM student WHERE name LIKE 'J%'"; - const result = await executeSELECTQuery(query); - // Expecting names starting with 'J' - expect(result).toEqual([{ name: 'John' }, { name: 'Jane' }]); +test("Execute SQL Query with LIKE Operator and Wildcards", async () => { + const query = "SELECT name FROM student WHERE name LIKE 'J%'"; + const result = await executeSELECTQuery(query); + // Expecting names starting with 'J' + expect(result).toEqual([{ name: "John" }, { name: "Jane" }]); }); -test('Execute SQL Query with LIKE Operator Case Insensitive', async () => { - const query = "SELECT name FROM student WHERE name LIKE '%bob%'"; - const result = await executeSELECTQuery(query); - // Expecting names 'Bob' (case insensitive) - expect(result).toEqual([{ name: 'Bob' }]); +test("Execute SQL Query with LIKE Operator Case Insensitive", async () => { + const query = "SELECT name FROM student WHERE name LIKE '%bob%'"; + const result = await executeSELECTQuery(query); + // Expecting names 'Bob' (case insensitive) + expect(result).toEqual([{ name: "Bob" }]); }); -test('Execute SQL Query with LIKE Operator and DISTINCT', async () => { - const query = "SELECT DISTINCT name FROM student WHERE name LIKE '%e%'"; - const result = await executeSELECTQuery(query); - // Expecting unique names containing 'e' - expect(result).toEqual([{ name: 'Jane' }, { name: 'Alice' }]); +test("Execute SQL Query with LIKE Operator and DISTINCT", async () => { + const query = "SELECT DISTINCT name FROM student WHERE name LIKE '%e%'"; + const result = await executeSELECTQuery(query); + // Expecting unique names containing 'e' + expect(result).toEqual([{ name: "Jane" }, { name: "Alice" }]); }); -test('LIKE with ORDER BY and LIMIT', async () => { - const query = "SELECT name FROM student WHERE name LIKE '%a%' ORDER BY name ASC LIMIT 2"; - const result = await executeSELECTQuery(query); - // Expecting the first two names alphabetically that contain 'a' - expect(result).toEqual([{ name: 'Alice' }, { name: 'Jane' }]); -}); \ No newline at end of file +test("LIKE with ORDER BY and LIMIT", async () => { + const query = + "SELECT name FROM student WHERE name LIKE '%a%' ORDER BY name ASC LIMIT 2"; + const result = await executeSELECTQuery(query); + // Expecting the first two names alphabetically that contain 'a' + expect(result).toEqual([{ name: "Alice" }, { name: "Jane" }]); +}); diff --git a/tests/step-16/index.test.js b/tests/step-16/index.test.js index a2aa4daee..8ce132ac1 100644 --- a/tests/step-16/index.test.js +++ b/tests/step-16/index.test.js @@ -1,822 +1,866 @@ -const readCSV = require('../../src/csvReader'); -const {parseQuery, parseJoinClause} = require('../../src/queryParser'); -const executeSELECTQuery = require('../../src/index'); - -test('Read CSV File', async () => { - const data = await readCSV('./student.csv'); - expect(data.length).toBeGreaterThan(0); - expect(data.length).toBe(4); - expect(data[0].name).toBe('John'); - expect(data[0].age).toBe('30'); //ignore the string type here, we will fix this later -}); - -test('Execute SQL Query', async () => { - const query = 'SELECT id, name FROM student'; - const result = await executeSELECTQuery(query); - expect(result.length).toBeGreaterThan(0); - expect(result[0]).toHaveProperty('id'); - expect(result[0]).toHaveProperty('name'); - expect(result[0]).not.toHaveProperty('age'); - expect(result[0]).toEqual({ id: '1', name: 'John' }); -}); - -test('Execute SQL Query with WHERE Clause', async () => { - const query = 'SELECT id, name FROM student WHERE age = 25'; - const result = await executeSELECTQuery(query); - expect(result.length).toBe(1); - expect(result[0]).toHaveProperty('id'); - expect(result[0]).toHaveProperty('name'); - expect(result[0].id).toBe('2'); -}); - -test('Execute SQL Query with Complex WHERE Clause', async () => { - const query = 'SELECT id, name FROM student WHERE age = 30 AND name = John'; - const result = await executeSELECTQuery(query); - expect(result.length).toBe(1); - expect(result[0]).toEqual({ id: '1', name: 'John' }); -}); - -test('Execute SQL Query with Greater Than', async () => { - const queryWithGT = 'SELECT id FROM student WHERE age > 22'; - const result = await executeSELECTQuery(queryWithGT); - expect(result.length).toEqual(3); - expect(result[0]).toHaveProperty('id'); -}); - -test('Execute SQL Query with Not Equal to', async () => { - const queryWithGT = 'SELECT name FROM student WHERE age != 25'; - const result = await executeSELECTQuery(queryWithGT); - expect(result.length).toEqual(3); - expect(result[0]).toHaveProperty('name'); -}); - -test('Execute SQL Query with INNER JOIN', async () => { - const query = 'SELECT student.name, enrollment.course FROM student INNER JOIN enrollment ON student.id=enrollment.student_id'; - const result = await executeSELECTQuery(query); - /* - result = [ - { 'student.name': 'John', 'enrollment.course': 'Mathematics' }, - { 'student.name': 'John', 'enrollment.course': 'Physics' }, - { 'student.name': 'Jane', 'enrollment.course': 'Chemistry' }, - { 'student.name': 'Bob', 'enrollment.course': 'Mathematics' } - ] - */ - expect(result.length).toEqual(4); - // toHaveProperty is not working here due to dot in the property name - expect(result[0]).toEqual(expect.objectContaining({ +const { readCSV } = require("../../src/csvReader"); +const { parseSelectQuery, parseJoinClause } = require("../../src/queryParser"); +const { executeSELECTQuery } = require("../../src/queryExecutor"); + +test("Read CSV File", async () => { + const data = await readCSV("./student.csv"); + expect(data.length).toBeGreaterThan(0); + expect(data.length).toBe(4); + expect(data[0].name).toBe("John"); + expect(data[0].age).toBe("30"); +}); + +test("Execute SQL Query", async () => { + const query = "SELECT id, name FROM student"; + const result = await executeSELECTQuery(query); + expect(result.length).toBeGreaterThan(0); + expect(result[0]).toHaveProperty("id"); + expect(result[0]).toHaveProperty("name"); + expect(result[0]).not.toHaveProperty("age"); + expect(result[0]).toEqual({ id: "1", name: "John" }); +}); + +test("Execute SQL Query with WHERE Clause", async () => { + const query = "SELECT id, name FROM student WHERE age = 25"; + const result = await executeSELECTQuery(query); + expect(result.length).toBe(1); + expect(result[0]).toHaveProperty("id"); + expect(result[0]).toHaveProperty("name"); + expect(result[0].id).toBe("2"); +}); + +test("Execute SQL Query with Complex WHERE Clause", async () => { + const query = "SELECT id, name FROM student WHERE age = 30 AND name = John"; + const result = await executeSELECTQuery(query); + expect(result.length).toBe(1); + expect(result[0]).toEqual({ id: "1", name: "John" }); +}); + +test("Execute SQL Query with Greater Than", async () => { + const queryWithGT = "SELECT id FROM student WHERE age > 22"; + const result = await executeSELECTQuery(queryWithGT); + expect(result.length).toEqual(3); + expect(result[0]).toHaveProperty("id"); +}); + +test("Execute SQL Query with Not Equal to", async () => { + const queryWithGT = "SELECT name FROM student WHERE age != 25"; + const result = await executeSELECTQuery(queryWithGT); + expect(result.length).toEqual(3); + expect(result[0]).toHaveProperty("name"); +}); + +test("Execute SQL Query with INNER JOIN", async () => { + const query = + "SELECT student.name, enrollment.course FROM student INNER JOIN enrollment ON student.id=enrollment.student_id"; + const result = await executeSELECTQuery(query); + expect(result.length).toEqual(4); + expect(result[0]).toEqual( + expect.objectContaining({ + "enrollment.course": "Mathematics", + "student.name": "John", + }) + ); +}); + +test("Execute SQL Query with INNER JOIN and a WHERE Clause", async () => { + const query = + "SELECT student.name, enrollment.course, student.age FROM student INNER JOIN enrollment ON student.id = enrollment.student_id WHERE student.age > 25"; + const result = await executeSELECTQuery(query); + expect(result.length).toEqual(2); + expect(result[0]).toEqual( + expect.objectContaining({ + "enrollment.course": "Mathematics", + "student.name": "John", + }) + ); +}); + +test("Execute SQL Query with LEFT JOIN", async () => { + const query = + "SELECT student.name, enrollment.course FROM student LEFT JOIN enrollment ON student.id=enrollment.student_id"; + const result = await executeSELECTQuery(query); + expect(result).toEqual( + expect.arrayContaining([ + expect.objectContaining({ + "student.name": "Alice", + "enrollment.course": null, + }), + expect.objectContaining({ + "student.name": "John", "enrollment.course": "Mathematics", - "student.name": "John" - })); -}); - -test('Execute SQL Query with INNER JOIN and a WHERE Clause', async () => { - const query = 'SELECT student.name, enrollment.course, student.age FROM student INNER JOIN enrollment ON student.id = enrollment.student_id WHERE student.age > 25'; - const result = await executeSELECTQuery(query); - /* - result = [ + }), + ]) + ); + expect(result.length).toEqual(5); +}); + +test("Execute SQL Query with RIGHT JOIN", async () => { + const query = + "SELECT student.name, enrollment.course FROM student RIGHT JOIN enrollment ON student.id=enrollment.student_id"; + const result = await executeSELECTQuery(query); + expect(result).toEqual( + expect.arrayContaining([ + expect.objectContaining({ + "student.name": null, + "enrollment.course": "Biology", + }), + expect.objectContaining({ + "student.name": "John", + "enrollment.course": "Mathematics", + }), + ]) + ); + expect(result.length).toEqual(5); +}); + +test("Execute SQL Query with LEFT JOIN with a WHERE clause filtering the main table", async () => { + const query = + "SELECT student.name, enrollment.course FROM student LEFT JOIN enrollment ON student.id=enrollment.student_id WHERE student.age > 22"; + const result = await executeSELECTQuery(query); + expect(result).toEqual( + expect.arrayContaining([ + expect.objectContaining({ + "enrollment.course": "Mathematics", + "student.name": "John", + }), + expect.objectContaining({ + "enrollment.course": "Physics", + "student.name": "John", + }), + ]) + ); + expect(result.length).toEqual(4); +}); + +test("Execute SQL Query with LEFT JOIN with a WHERE clause filtering the join table", async () => { + const query = `SELECT student.name, enrollment.course FROM student LEFT JOIN enrollment ON student.id=enrollment.student_id WHERE enrollment.course = 'Physics'`; + const result = await executeSELECTQuery(query); + expect(result).toEqual( + expect.arrayContaining([ + expect.objectContaining({ + "student.name": "John", + "enrollment.course": "Physics", + }), + ]) + ); + expect(result.length).toEqual(1); +}); + +test("Execute SQL Query with RIGHT JOIN with a WHERE clause filtering the main table", async () => { + const query = + "SELECT student.name, enrollment.course FROM student RIGHT JOIN enrollment ON student.id=enrollment.student_id WHERE student.age < 25"; + const result = await executeSELECTQuery(query); + expect(result).toEqual( + expect.arrayContaining([ + expect.objectContaining({ + "enrollment.course": "Mathematics", + "student.name": "Bob", + }), + expect.objectContaining({ + "enrollment.course": "Biology", + "student.name": null, + }), + ]) + ); + expect(result.length).toEqual(2); +}); + +test("Execute SQL Query with RIGHT JOIN with a WHERE clause filtering the join table", async () => { + const query = `SELECT student.name, enrollment.course FROM student RIGHT JOIN enrollment ON student.id=enrollment.student_id WHERE enrollment.course = 'Chemistry'`; + const result = await executeSELECTQuery(query); + expect(result).toEqual( + expect.arrayContaining([ + expect.objectContaining({ + "enrollment.course": "Chemistry", + "student.name": "Jane", + }), + ]) + ); + expect(result.length).toEqual(1); +}); + +test("Execute SQL Query with RIGHT JOIN with a multiple WHERE clauses filtering the join table and main table", async () => { + const query = `SELECT student.name, enrollment.course FROM student RIGHT JOIN enrollment ON student.id=enrollment.student_id WHERE enrollment.course = 'Chemistry' AND student.age = 26`; + const result = await executeSELECTQuery(query); + expect(result).toEqual([]); +}); + +test("Execute COUNT Aggregate Query", async () => { + const query = "SELECT COUNT(*) FROM student"; + const result = await executeSELECTQuery(query); + expect(result).toEqual([{ "COUNT(*)": 4 }]); +}); + +test("Execute SUM Aggregate Query", async () => { + const query = "SELECT SUM(age) FROM student"; + const result = await executeSELECTQuery(query); + expect(result).toEqual([{ "SUM(age)": 101 }]); +}); + +test("Execute AVG Aggregate Query", async () => { + const query = "SELECT AVG(age) FROM student"; + const result = await executeSELECTQuery(query); + expect(result).toEqual([{ "AVG(age)": 25.25 }]); +}); + +test("Execute MIN Aggregate Query", async () => { + const query = "SELECT MIN(age) FROM student"; + const result = await executeSELECTQuery(query); + expect(result).toEqual([{ "MIN(age)": 22 }]); +}); + +test("Execute MAX Aggregate Query", async () => { + const query = "SELECT MAX(age) FROM student"; + const result = await executeSELECTQuery(query); + expect(result).toEqual([{ "MAX(age)": 30 }]); +}); + +test("Count students per age", async () => { + const query = "SELECT age, COUNT(*) FROM student GROUP BY age"; + const result = await executeSELECTQuery(query); + expect(result).toEqual([ + { age: "22", "COUNT(*)": 1 }, + { age: "24", "COUNT(*)": 1 }, + { age: "25", "COUNT(*)": 1 }, + { age: "30", "COUNT(*)": 1 }, + ]); +}); + +test("Count enrollments per course", async () => { + const query = "SELECT course, COUNT(*) FROM enrollment GROUP BY course"; + const result = await executeSELECTQuery(query); + expect(result).toEqual([ + { course: "Mathematics", "COUNT(*)": 2 }, + { course: "Physics", "COUNT(*)": 1 }, + { course: "Chemistry", "COUNT(*)": 1 }, + { course: "Biology", "COUNT(*)": 1 }, + ]); +}); + +test("Count courses per student", async () => { + const query = + "SELECT student_id, COUNT(*) FROM enrollment GROUP BY student_id"; + const result = await executeSELECTQuery(query); + expect(result).toEqual([ + { student_id: "1", "COUNT(*)": 2 }, + { student_id: "2", "COUNT(*)": 1 }, + { student_id: "3", "COUNT(*)": 1 }, + { student_id: "5", "COUNT(*)": 1 }, + ]); +}); + +test("Count students within a specific age range", async () => { + const query = "SELECT age, COUNT(*) FROM student WHERE age > 22 GROUP BY age"; + const result = await executeSELECTQuery(query); + expect(result).toEqual([ + { age: "24", "COUNT(*)": 1 }, + { age: "25", "COUNT(*)": 1 }, + { age: "30", "COUNT(*)": 1 }, + ]); +}); + +test("Count enrollments for a specific course", async () => { + const query = + 'SELECT course, COUNT(*) FROM enrollment WHERE course = "Mathematics" GROUP BY course'; + const result = await executeSELECTQuery(query); + expect(result).toEqual([{ course: "Mathematics", "COUNT(*)": 2 }]); +}); + +test("Count courses for a specific student", async () => { + const query = + "SELECT student_id, COUNT(*) FROM enrollment WHERE student_id = 1 GROUP BY student_id"; + const result = await executeSELECTQuery(query); + expect(result).toEqual([{ student_id: "1", "COUNT(*)": 2 }]); +}); + +test("Average age of students above a certain age", async () => { + const query = "SELECT AVG(age) FROM student WHERE age > 22"; + const result = await executeSELECTQuery(query); + const expectedAverage = (25 + 30 + 24) / 3; + expect(result).toEqual([{ "AVG(age)": expectedAverage }]); +}); + +test("Parse SQL Query", () => { + const query = "SELECT id, name FROM student"; + const parsed = parseSelectQuery(query); + expect(parsed).toEqual({ + fields: ["id", "name"], + table: "student", + whereClauses: [], + joinCondition: null, + joinTable: null, + joinType: null, + groupByFields: null, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse SQL Query with WHERE Clause", () => { + const query = "SELECT id, name FROM student WHERE age = 25"; + const parsed = parseSelectQuery(query); + expect(parsed).toEqual({ + fields: ["id", "name"], + table: "student", + whereClauses: [ { - 'student.name': 'John', - 'enrollment.course': 'Mathematics', - 'student.age': '30' + field: "age", + operator: "=", + value: "25", }, + ], + joinCondition: null, + joinTable: null, + joinType: null, + groupByFields: null, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse SQL Query with Multiple WHERE Clauses", () => { + const query = "SELECT id, name FROM student WHERE age = 30 AND name = John"; + const parsed = parseSelectQuery(query); + expect(parsed).toEqual({ + fields: ["id", "name"], + table: "student", + whereClauses: [ { - 'student.name': 'John', - 'enrollment.course': 'Physics', - 'student.age': '30' - } - ] - */ - expect(result.length).toEqual(2); - // toHaveProperty is not working here due to dot in the property name - expect(result[0]).toEqual(expect.objectContaining({ - "enrollment.course": "Mathematics", - "student.name": "John" - })); -}); - -test('Execute SQL Query with LEFT JOIN', async () => { - const query = 'SELECT student.name, enrollment.course FROM student LEFT JOIN enrollment ON student.id=enrollment.student_id'; - const result = await executeSELECTQuery(query); - expect(result).toEqual(expect.arrayContaining([ - expect.objectContaining({ "student.name": "Alice", "enrollment.course": null }), - expect.objectContaining({ "student.name": "John", "enrollment.course": "Mathematics" }) - ])); - expect(result.length).toEqual(5); // 4 students, but John appears twice -}); - -test('Execute SQL Query with RIGHT JOIN', async () => { - const query = 'SELECT student.name, enrollment.course FROM student RIGHT JOIN enrollment ON student.id=enrollment.student_id'; - const result = await executeSELECTQuery(query); - expect(result).toEqual(expect.arrayContaining([ - expect.objectContaining({ "student.name": null, "enrollment.course": "Biology" }), - expect.objectContaining({ "student.name": "John", "enrollment.course": "Mathematics" }) - ])); - expect(result.length).toEqual(5); // 4 courses, but Mathematics appears twice -}); - -test('Execute SQL Query with LEFT JOIN with a WHERE clause filtering the main table', async () => { - const query = 'SELECT student.name, enrollment.course FROM student LEFT JOIN enrollment ON student.id=enrollment.student_id WHERE student.age > 22'; - const result = await executeSELECTQuery(query); - expect(result).toEqual(expect.arrayContaining([ - expect.objectContaining({ "enrollment.course": "Mathematics", "student.name": "John" }), - expect.objectContaining({ "enrollment.course": "Physics", "student.name": "John" }) - ])); - expect(result.length).toEqual(4); -}); - -test('Execute SQL Query with LEFT JOIN with a WHERE clause filtering the join table', async () => { - const query = `SELECT student.name, enrollment.course FROM student LEFT JOIN enrollment ON student.id=enrollment.student_id WHERE enrollment.course = 'Physics'`; - const result = await executeSELECTQuery(query); - expect(result).toEqual(expect.arrayContaining([ - expect.objectContaining({ "student.name": "John", "enrollment.course": "Physics" }) - ])); - expect(result.length).toEqual(1); -}); - -test('Execute SQL Query with RIGHT JOIN with a WHERE clause filtering the main table', async () => { - const query = 'SELECT student.name, enrollment.course FROM student RIGHT JOIN enrollment ON student.id=enrollment.student_id WHERE student.age < 25'; - const result = await executeSELECTQuery(query); - expect(result).toEqual(expect.arrayContaining([ - expect.objectContaining({ "enrollment.course": "Mathematics", "student.name": "Bob" }), - expect.objectContaining({ "enrollment.course": "Biology", "student.name": null }) - ])); - expect(result.length).toEqual(2); -}); - -test('Execute SQL Query with RIGHT JOIN with a WHERE clause filtering the join table', async () => { - const query = `SELECT student.name, enrollment.course FROM student RIGHT JOIN enrollment ON student.id=enrollment.student_id WHERE enrollment.course = 'Chemistry'`; - const result = await executeSELECTQuery(query); - expect(result).toEqual(expect.arrayContaining([ - expect.objectContaining({ "enrollment.course": "Chemistry", "student.name": "Jane" }), - ])); - expect(result.length).toEqual(1); -}); - -test('Execute SQL Query with RIGHT JOIN with a multiple WHERE clauses filtering the join table and main table', async () => { - const query = `SELECT student.name, enrollment.course FROM student RIGHT JOIN enrollment ON student.id=enrollment.student_id WHERE enrollment.course = 'Chemistry' AND student.age = 26`; - const result = await executeSELECTQuery(query); - expect(result).toEqual([]); -}); - -test('Execute COUNT Aggregate Query', async () => { - const query = 'SELECT COUNT(*) FROM student'; - const result = await executeSELECTQuery(query); - expect(result).toEqual([{ 'COUNT(*)': 4 }]); -}); - -test('Execute SUM Aggregate Query', async () => { - const query = 'SELECT SUM(age) FROM student'; - const result = await executeSELECTQuery(query); - expect(result).toEqual([{ 'SUM(age)': 101 }]); -}); - -test('Execute AVG Aggregate Query', async () => { - const query = 'SELECT AVG(age) FROM student'; - const result = await executeSELECTQuery(query); - // Assuming AVG returns a single decimal point value - expect(result).toEqual([{ 'AVG(age)': 25.25 }]); -}); - -test('Execute MIN Aggregate Query', async () => { - const query = 'SELECT MIN(age) FROM student'; - const result = await executeSELECTQuery(query); - expect(result).toEqual([{ 'MIN(age)': 22 }]); -}); - -test('Execute MAX Aggregate Query', async () => { - const query = 'SELECT MAX(age) FROM student'; - const result = await executeSELECTQuery(query); - expect(result).toEqual([{ 'MAX(age)': 30 }]); -}); - -test('Count students per age', async () => { - const query = 'SELECT age, COUNT(*) FROM student GROUP BY age'; - const result = await executeSELECTQuery(query); - expect(result).toEqual([ - { age: '22', 'COUNT(*)': 1 }, - { age: '24', 'COUNT(*)': 1 }, - { age: '25', 'COUNT(*)': 1 }, - { age: '30', 'COUNT(*)': 1 } - ]); -}); - -test('Count enrollments per course', async () => { - const query = 'SELECT course, COUNT(*) FROM enrollment GROUP BY course'; - const result = await executeSELECTQuery(query); - expect(result).toEqual([ - { course: 'Mathematics', 'COUNT(*)': 2 }, - { course: 'Physics', 'COUNT(*)': 1 }, - { course: 'Chemistry', 'COUNT(*)': 1 }, - { course: 'Biology', 'COUNT(*)': 1 } - ]); -}); - - -test('Count courses per student', async () => { - const query = 'SELECT student_id, COUNT(*) FROM enrollment GROUP BY student_id'; - const result = await executeSELECTQuery(query); - expect(result).toEqual([ - { student_id: '1', 'COUNT(*)': 2 }, - { student_id: '2', 'COUNT(*)': 1 }, - { student_id: '3', 'COUNT(*)': 1 }, - { student_id: '5', 'COUNT(*)': 1 } - ]); -}); - -test('Count students within a specific age range', async () => { - const query = 'SELECT age, COUNT(*) FROM student WHERE age > 22 GROUP BY age'; - const result = await executeSELECTQuery(query); - expect(result).toEqual([ - { age: '24', 'COUNT(*)': 1 }, - { age: '25', 'COUNT(*)': 1 }, - { age: '30', 'COUNT(*)': 1 } - ]); -}); - -test('Count enrollments for a specific course', async () => { - const query = 'SELECT course, COUNT(*) FROM enrollment WHERE course = "Mathematics" GROUP BY course'; - const result = await executeSELECTQuery(query); - expect(result).toEqual([ - { course: 'Mathematics', 'COUNT(*)': 2 } - ]); -}); - -test('Count courses for a specific student', async () => { - const query = 'SELECT student_id, COUNT(*) FROM enrollment WHERE student_id = 1 GROUP BY student_id'; - const result = await executeSELECTQuery(query); - expect(result).toEqual([ - { student_id: '1', 'COUNT(*)': 2 } - ]); -}); - -test('Average age of students above a certain age', async () => { - const query = 'SELECT AVG(age) FROM student WHERE age > 22'; - const result = await executeSELECTQuery(query); - const expectedAverage = (25 + 30 + 24) / 3; // Average age of students older than 22 - expect(result).toEqual([{ 'AVG(age)': expectedAverage }]); -}); - -test('Parse SQL Query', () => { - const query = 'SELECT id, name FROM student'; - const parsed = parseQuery(query); - expect(parsed).toEqual({ - fields: ['id', 'name'], - table: 'student', - whereClauses: [], - joinCondition: null, - joinTable: null, - joinType: null, - groupByFields: null, - hasAggregateWithoutGroupBy: false, - "orderByFields": null, - "limit": null, - isDistinct: false - }); -}); - -test('Parse SQL Query with WHERE Clause', () => { - const query = 'SELECT id, name FROM student WHERE age = 25'; - const parsed = parseQuery(query); - expect(parsed).toEqual({ - fields: ['id', 'name'], - table: 'student', - whereClauses: [{ - "field": "age", - "operator": "=", - "value": "25", - }], - joinCondition: null, - joinTable: null, - joinType: null, - groupByFields: null, - hasAggregateWithoutGroupBy: false, - "orderByFields": null, - "limit": null, - isDistinct: false - }); -}); - -test('Parse SQL Query with Multiple WHERE Clauses', () => { - const query = 'SELECT id, name FROM student WHERE age = 30 AND name = John'; - const parsed = parseQuery(query); - expect(parsed).toEqual({ - fields: ['id', 'name'], - table: 'student', - whereClauses: [{ - "field": "age", - "operator": "=", - "value": "30", - }, { - "field": "name", - "operator": "=", - "value": "John", - }], - joinCondition: null, - joinTable: null, - joinType: null, - groupByFields: null, - hasAggregateWithoutGroupBy: false, - "orderByFields": null, - "limit": null, - isDistinct: false - }); -}); - -test('Parse SQL Query with INNER JOIN', async () => { - const query = 'SELECT student.name, enrollment.course FROM student INNER JOIN enrollment ON student.id=enrollment.student_id'; - const result = await parseQuery(query); - expect(result).toEqual({ - fields: ['student.name', 'enrollment.course'], - table: 'student', - whereClauses: [], - joinTable: 'enrollment', - joinType: "INNER", - joinCondition: { left: 'student.id', right: 'enrollment.student_id' }, - groupByFields: null, - hasAggregateWithoutGroupBy: false, - "orderByFields": null, - "limit": null, - isDistinct: false - }) -}); - -test('Parse SQL Query with INNER JOIN and WHERE Clause', async () => { - const query = 'SELECT student.name, enrollment.course FROM student INNER JOIN enrollment ON student.id = enrollment.student_id WHERE student.age > 20'; - const result = await parseQuery(query); - expect(result).toEqual({ - fields: ['student.name', 'enrollment.course'], - table: 'student', - whereClauses: [{ field: 'student.age', operator: '>', value: '20' }], - joinTable: 'enrollment', - joinType: "INNER", - joinCondition: { left: 'student.id', right: 'enrollment.student_id' }, - groupByFields: null, - hasAggregateWithoutGroupBy: false, - "orderByFields": null, - "limit": null, - isDistinct: false - }) + field: "age", + operator: "=", + value: "30", + }, + { + field: "name", + operator: "=", + value: "John", + }, + ], + joinCondition: null, + joinTable: null, + joinType: null, + groupByFields: null, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse SQL Query with INNER JOIN", async () => { + const query = + "SELECT student.name, enrollment.course FROM student INNER JOIN enrollment ON student.id=enrollment.student_id"; + const result = await parseSelectQuery(query); + expect(result).toEqual({ + fields: ["student.name", "enrollment.course"], + table: "student", + whereClauses: [], + joinTable: "enrollment", + joinType: "INNER", + joinCondition: { left: "student.id", right: "enrollment.student_id" }, + groupByFields: null, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse SQL Query with INNER JOIN and WHERE Clause", async () => { + const query = + "SELECT student.name, enrollment.course FROM student INNER JOIN enrollment ON student.id = enrollment.student_id WHERE student.age > 20"; + const result = await parseSelectQuery(query); + expect(result).toEqual({ + fields: ["student.name", "enrollment.course"], + table: "student", + whereClauses: [{ field: "student.age", operator: ">", value: "20" }], + joinTable: "enrollment", + joinType: "INNER", + joinCondition: { left: "student.id", right: "enrollment.student_id" }, + groupByFields: null, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse INNER JOIN clause", () => { + const query = + "SELECT * FROM table1 INNER JOIN table2 ON table1.id = table2.ref_id"; + const result = parseJoinClause(query); + expect(result).toEqual({ + joinType: "INNER", + joinTable: "table2", + joinCondition: { left: "table1.id", right: "table2.ref_id" }, + }); +}); + +test("Parse LEFT JOIN clause", () => { + const query = + "SELECT * FROM table1 LEFT JOIN table2 ON table1.id = table2.ref_id"; + const result = parseJoinClause(query); + expect(result).toEqual({ + joinType: "LEFT", + joinTable: "table2", + joinCondition: { left: "table1.id", right: "table2.ref_id" }, + }); +}); + +test("Parse RIGHT JOIN clause", () => { + const query = + "SELECT * FROM table1 RIGHT JOIN table2 ON table1.id = table2.ref_id"; + const result = parseJoinClause(query); + expect(result).toEqual({ + joinType: "RIGHT", + joinTable: "table2", + joinCondition: { left: "table1.id", right: "table2.ref_id" }, + }); +}); + +test("Returns null for queries without JOIN", () => { + const query = "SELECT * FROM table1"; + const result = parseJoinClause(query); + expect(result).toEqual({ + joinType: null, + joinTable: null, + joinCondition: null, + }); +}); + +test("Parse LEFT Join Query Completely", () => { + const query = + "SELECT student.name, enrollment.course FROM student LEFT JOIN enrollment ON student.id=enrollment.student_id"; + const result = parseSelectQuery(query); + expect(result).toEqual({ + fields: ["student.name", "enrollment.course"], + table: "student", + whereClauses: [], + joinType: "LEFT", + joinTable: "enrollment", + joinCondition: { left: "student.id", right: "enrollment.student_id" }, + groupByFields: null, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse LEFT Join Query Completely", () => { + const query = + "SELECT student.name, enrollment.course FROM student RIGHT JOIN enrollment ON student.id=enrollment.student_id"; + const result = parseSelectQuery(query); + expect(result).toEqual({ + fields: ["student.name", "enrollment.course"], + table: "student", + whereClauses: [], + joinType: "RIGHT", + joinTable: "enrollment", + joinCondition: { left: "student.id", right: "enrollment.student_id" }, + groupByFields: null, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse SQL Query with LEFT JOIN with a WHERE clause filtering the main table", async () => { + const query = + "SELECT student.name, enrollment.course FROM student LEFT JOIN enrollment ON student.id=enrollment.student_id WHERE student.age > 22"; + const result = await parseSelectQuery(query); + expect(result).toEqual({ + fields: ["student.name", "enrollment.course"], + joinCondition: { left: "student.id", right: "enrollment.student_id" }, + joinTable: "enrollment", + joinType: "LEFT", + table: "student", + whereClauses: [{ field: "student.age", operator: ">", value: "22" }], + groupByFields: null, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse SQL Query with LEFT JOIN with a WHERE clause filtering the join table", async () => { + const query = `SELECT student.name, enrollment.course FROM student LEFT JOIN enrollment ON student.id=enrollment.student_id WHERE enrollment.course = 'Physics'`; + const result = await parseSelectQuery(query); + expect(result).toEqual({ + fields: ["student.name", "enrollment.course"], + joinCondition: { left: "student.id", right: "enrollment.student_id" }, + joinTable: "enrollment", + joinType: "LEFT", + table: "student", + whereClauses: [ + { field: "enrollment.course", operator: "=", value: "'Physics'" }, + ], + groupByFields: null, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse SQL Query with RIGHT JOIN with a WHERE clause filtering the main table", async () => { + const query = + "SELECT student.name, enrollment.course FROM student RIGHT JOIN enrollment ON student.id=enrollment.student_id WHERE student.age < 25"; + const result = await parseSelectQuery(query); + expect(result).toEqual({ + fields: ["student.name", "enrollment.course"], + joinCondition: { left: "student.id", right: "enrollment.student_id" }, + joinTable: "enrollment", + joinType: "RIGHT", + table: "student", + whereClauses: [{ field: "student.age", operator: "<", value: "25" }], + groupByFields: null, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse SQL Query with RIGHT JOIN with a WHERE clause filtering the join table", async () => { + const query = `SELECT student.name, enrollment.course FROM student RIGHT JOIN enrollment ON student.id=enrollment.student_id WHERE enrollment.course = 'Chemistry'`; + const result = await parseSelectQuery(query); + expect(result).toEqual({ + fields: ["student.name", "enrollment.course"], + joinCondition: { left: "student.id", right: "enrollment.student_id" }, + joinTable: "enrollment", + joinType: "RIGHT", + table: "student", + whereClauses: [ + { field: "enrollment.course", operator: "=", value: "'Chemistry'" }, + ], + groupByFields: null, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse COUNT Aggregate Query", () => { + const query = "SELECT COUNT(*) FROM student"; + const parsed = parseSelectQuery(query); + expect(parsed).toEqual({ + fields: ["COUNT(*)"], + table: "student", + whereClauses: [], + groupByFields: null, + hasAggregateWithoutGroupBy: true, + joinCondition: null, + joinTable: null, + joinType: null, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse SUM Aggregate Query", () => { + const query = "SELECT SUM(age) FROM student"; + const parsed = parseSelectQuery(query); + expect(parsed).toEqual({ + fields: ["SUM(age)"], + table: "student", + whereClauses: [], + groupByFields: null, + hasAggregateWithoutGroupBy: true, + joinCondition: null, + joinTable: null, + joinType: null, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse AVG Aggregate Query", () => { + const query = "SELECT AVG(age) FROM student"; + const parsed = parseSelectQuery(query); + expect(parsed).toEqual({ + fields: ["AVG(age)"], + table: "student", + whereClauses: [], + groupByFields: null, + hasAggregateWithoutGroupBy: true, + joinCondition: null, + joinTable: null, + joinType: null, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse MIN Aggregate Query", () => { + const query = "SELECT MIN(age) FROM student"; + const parsed = parseSelectQuery(query); + expect(parsed).toEqual({ + fields: ["MIN(age)"], + table: "student", + whereClauses: [], + groupByFields: null, + hasAggregateWithoutGroupBy: true, + joinCondition: null, + joinTable: null, + joinType: null, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse MAX Aggregate Query", () => { + const query = "SELECT MAX(age) FROM student"; + const parsed = parseSelectQuery(query); + expect(parsed).toEqual({ + fields: ["MAX(age)"], + table: "student", + whereClauses: [], + groupByFields: null, + hasAggregateWithoutGroupBy: true, + joinCondition: null, + joinTable: null, + joinType: null, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse basic GROUP BY query", () => { + const query = "SELECT age, COUNT(*) FROM student GROUP BY age"; + const parsed = parseSelectQuery(query); + expect(parsed).toEqual({ + fields: ["age", "COUNT(*)"], + table: "student", + whereClauses: [], + groupByFields: ["age"], + joinType: null, + joinTable: null, + joinCondition: null, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse GROUP BY query with WHERE clause", () => { + const query = "SELECT age, COUNT(*) FROM student WHERE age > 22 GROUP BY age"; + const parsed = parseSelectQuery(query); + expect(parsed).toEqual({ + fields: ["age", "COUNT(*)"], + table: "student", + whereClauses: [{ field: "age", operator: ">", value: "22" }], + groupByFields: ["age"], + joinType: null, + joinTable: null, + joinCondition: null, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse GROUP BY query with multiple fields", () => { + const query = + "SELECT student_id, course, COUNT(*) FROM enrollment GROUP BY student_id, course"; + const parsed = parseSelectQuery(query); + expect(parsed).toEqual({ + fields: ["student_id", "course", "COUNT(*)"], + table: "enrollment", + whereClauses: [], + groupByFields: ["student_id", "course"], + joinType: null, + joinTable: null, + joinCondition: null, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse GROUP BY query with JOIN and WHERE clauses", () => { + const query = + 'SELECT student.name, COUNT(*) FROM student INNER JOIN enrollment ON student.id = enrollment.student_id WHERE enrollment.course = "Mathematics" GROUP BY student.name'; + const parsed = parseSelectQuery(query); + expect(parsed).toEqual({ + fields: ["student.name", "COUNT(*)"], + table: "student", + whereClauses: [ + { field: "enrollment.course", operator: "=", value: '"Mathematics"' }, + ], + groupByFields: ["student.name"], + joinType: "INNER", + joinTable: "enrollment", + joinCondition: { + left: "student.id", + right: "enrollment.student_id", + }, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Execute SQL Query with ORDER BY", async () => { + const query = "SELECT name FROM student ORDER BY name ASC"; + const result = await executeSELECTQuery(query); + + expect(result).toStrictEqual([ + { name: "Alice" }, + { name: "Bob" }, + { name: "Jane" }, + { name: "John" }, + ]); +}); + +test("Execute SQL Query with ORDER BY and WHERE", async () => { + const query = "SELECT name FROM student WHERE age > 24 ORDER BY name DESC"; + const result = await executeSELECTQuery(query); + + expect(result).toStrictEqual([{ name: "John" }, { name: "Jane" }]); +}); +test("Execute SQL Query with ORDER BY and GROUP BY", async () => { + const query = + "SELECT COUNT(id) as count, age FROM student GROUP BY age ORDER BY age DESC"; + const result = await executeSELECTQuery(query); + + expect(result).toStrictEqual([ + { age: "30", "COUNT(id) as count": 1 }, + { age: "25", "COUNT(id) as count": 1 }, + { age: "24", "COUNT(id) as count": 1 }, + { age: "22", "COUNT(id) as count": 1 }, + ]); +}); + +test("Execute SQL Query with standard LIMIT clause", async () => { + const query = "SELECT id, name FROM student LIMIT 2"; + const result = await executeSELECTQuery(query); + expect(result.length).toEqual(2); +}); + +test("Execute SQL Query with LIMIT clause equal to total rows", async () => { + const query = "SELECT id, name FROM student LIMIT 4"; + const result = await executeSELECTQuery(query); + expect(result.length).toEqual(4); +}); + +test("Execute SQL Query with LIMIT clause exceeding total rows", async () => { + const query = "SELECT id, name FROM student LIMIT 10"; + const result = await executeSELECTQuery(query); + expect(result.length).toEqual(4); +}); + +test("Execute SQL Query with LIMIT 0", async () => { + const query = "SELECT id, name FROM student LIMIT 0"; + const result = await executeSELECTQuery(query); + expect(result.length).toEqual(0); +}); + +test("Execute SQL Query with LIMIT and ORDER BY clause", async () => { + const query = "SELECT id, name FROM student ORDER BY age DESC LIMIT 2"; + const result = await executeSELECTQuery(query); + expect(result.length).toEqual(2); + expect(result[0].name).toEqual("John"); + expect(result[1].name).toEqual("Jane"); +}); + +test("Error Handling with Malformed Query", async () => { + const query = "SELECT FROM table"; + await expect(executeSELECTQuery(query)).rejects.toThrow( + "Error executing query: Query parsing error: Invalid SELECT format" + ); +}); + +test("Basic DISTINCT Usage", async () => { + const query = "SELECT DISTINCT age FROM student"; + const result = await executeSELECTQuery(query); + expect(result).toEqual([ + { age: "30" }, + { age: "25" }, + { age: "22" }, + { age: "24" }, + ]); }); -test('Parse INNER JOIN clause', () => { - const query = 'SELECT * FROM table1 INNER JOIN table2 ON table1.id = table2.ref_id'; - const result = parseJoinClause(query); - expect(result).toEqual({ - joinType: 'INNER', - joinTable: 'table2', - joinCondition: { left: 'table1.id', right: 'table2.ref_id' }, - }); -}); - -test('Parse LEFT JOIN clause', () => { - const query = 'SELECT * FROM table1 LEFT JOIN table2 ON table1.id = table2.ref_id'; - const result = parseJoinClause(query); - expect(result).toEqual({ - joinType: 'LEFT', - joinTable: 'table2', - joinCondition: { left: 'table1.id', right: 'table2.ref_id' } - }); -}); - -test('Parse RIGHT JOIN clause', () => { - const query = 'SELECT * FROM table1 RIGHT JOIN table2 ON table1.id = table2.ref_id'; - const result = parseJoinClause(query); - expect(result).toEqual({ - joinType: 'RIGHT', - joinTable: 'table2', - joinCondition: { left: 'table1.id', right: 'table2.ref_id' } - }); -}); - -test('Returns null for queries without JOIN', () => { - const query = 'SELECT * FROM table1'; - const result = parseJoinClause(query); - expect(result).toEqual( - { - joinType: null, - joinTable: null, - joinCondition: null - } - ); -}); - -test('Parse LEFT Join Query Completely', () => { - const query = 'SELECT student.name, enrollment.course FROM student LEFT JOIN enrollment ON student.id=enrollment.student_id'; - const result = parseQuery(query); - expect(result).toEqual({ - fields: ['student.name', 'enrollment.course'], - table: 'student', - whereClauses: [], - joinType: 'LEFT', - joinTable: 'enrollment', - joinCondition: { left: 'student.id', right: 'enrollment.student_id' }, - groupByFields: null, - hasAggregateWithoutGroupBy: false, - "orderByFields": null, - "limit": null, - isDistinct: false - }) -}) - -test('Parse LEFT Join Query Completely', () => { - const query = 'SELECT student.name, enrollment.course FROM student RIGHT JOIN enrollment ON student.id=enrollment.student_id'; - const result = parseQuery(query); - expect(result).toEqual({ - fields: ['student.name', 'enrollment.course'], - table: 'student', - whereClauses: [], - joinType: 'RIGHT', - joinTable: 'enrollment', - joinCondition: { left: 'student.id', right: 'enrollment.student_id' }, - groupByFields: null, - hasAggregateWithoutGroupBy: false, - "orderByFields": null, - "limit": null, - isDistinct: false - }) -}) - -test('Parse SQL Query with LEFT JOIN with a WHERE clause filtering the main table', async () => { - const query = 'SELECT student.name, enrollment.course FROM student LEFT JOIN enrollment ON student.id=enrollment.student_id WHERE student.age > 22'; - const result = await parseQuery(query); - expect(result).toEqual({ - "fields": ["student.name", "enrollment.course"], - "joinCondition": { "left": "student.id", "right": "enrollment.student_id" }, - "joinTable": "enrollment", - "joinType": "LEFT", - "table": "student", - "whereClauses": [{ "field": "student.age", "operator": ">", "value": "22" }], - groupByFields: null, - hasAggregateWithoutGroupBy: false, - "orderByFields": null, - "limit": null, - isDistinct: false - }); -}); - -test('Parse SQL Query with LEFT JOIN with a WHERE clause filtering the join table', async () => { - const query = `SELECT student.name, enrollment.course FROM student LEFT JOIN enrollment ON student.id=enrollment.student_id WHERE enrollment.course = 'Physics'`; - const result = await parseQuery(query); - expect(result).toEqual({ - "fields": ["student.name", "enrollment.course"], - "joinCondition": { "left": "student.id", "right": "enrollment.student_id" }, - "joinTable": "enrollment", - "joinType": "LEFT", - "table": "student", - "whereClauses": [{ "field": "enrollment.course", "operator": "=", "value": "'Physics'" }], - groupByFields: null, - hasAggregateWithoutGroupBy: false, - "orderByFields": null, - "limit": null, - isDistinct: false - }); -}); - -test('Parse SQL Query with RIGHT JOIN with a WHERE clause filtering the main table', async () => { - const query = 'SELECT student.name, enrollment.course FROM student RIGHT JOIN enrollment ON student.id=enrollment.student_id WHERE student.age < 25'; - const result = await parseQuery(query); - expect(result).toEqual({ - "fields": ["student.name", "enrollment.course"], - "joinCondition": { "left": "student.id", "right": "enrollment.student_id" }, - "joinTable": "enrollment", - "joinType": "RIGHT", - "table": "student", - "whereClauses": [{ "field": "student.age", "operator": "<", "value": "25" }], - groupByFields: null, - hasAggregateWithoutGroupBy: false, - "orderByFields": null, - "limit": null, - isDistinct: false - }); -}); - -test('Parse SQL Query with RIGHT JOIN with a WHERE clause filtering the join table', async () => { - const query = `SELECT student.name, enrollment.course FROM student RIGHT JOIN enrollment ON student.id=enrollment.student_id WHERE enrollment.course = 'Chemistry'`; - const result = await parseQuery(query); - expect(result).toEqual({ - "fields": ["student.name", "enrollment.course"], - "joinCondition": { "left": "student.id", "right": "enrollment.student_id" }, - "joinTable": "enrollment", - "joinType": "RIGHT", - "table": "student", - "whereClauses": [{ "field": "enrollment.course", "operator": "=", "value": "'Chemistry'" }], - groupByFields: null, - hasAggregateWithoutGroupBy: false, - "orderByFields": null, - "limit": null, - isDistinct: false - }); -}); - - -test('Parse COUNT Aggregate Query', () => { - const query = 'SELECT COUNT(*) FROM student'; - const parsed = parseQuery(query); - expect(parsed).toEqual({ - fields: ['COUNT(*)'], - table: 'student', - whereClauses: [], - groupByFields: null, - hasAggregateWithoutGroupBy: true, - "joinCondition": null, - "joinTable": null, - "joinType": null, - "orderByFields": null, - "limit": null, - isDistinct: false - }); -}); - - -test('Parse SUM Aggregate Query', () => { - const query = 'SELECT SUM(age) FROM student'; - const parsed = parseQuery(query); - expect(parsed).toEqual({ - fields: ['SUM(age)'], - table: 'student', - whereClauses: [], - groupByFields: null, - hasAggregateWithoutGroupBy: true, - "joinCondition": null, - "joinTable": null, - "joinType": null, - "orderByFields": null, - "limit": null, - isDistinct: false - }); -}); - -test('Parse AVG Aggregate Query', () => { - const query = 'SELECT AVG(age) FROM student'; - const parsed = parseQuery(query); - expect(parsed).toEqual({ - fields: ['AVG(age)'], - table: 'student', - whereClauses: [], - groupByFields: null, - hasAggregateWithoutGroupBy: true, - "joinCondition": null, - "joinTable": null, - "joinType": null, - "orderByFields": null, - "limit": null, - isDistinct: false - }); -}); - -test('Parse MIN Aggregate Query', () => { - const query = 'SELECT MIN(age) FROM student'; - const parsed = parseQuery(query); - expect(parsed).toEqual({ - fields: ['MIN(age)'], - table: 'student', - whereClauses: [], - groupByFields: null, - hasAggregateWithoutGroupBy: true, - "joinCondition": null, - "joinTable": null, - "joinType": null, - "orderByFields": null, - "limit": null, - isDistinct: false - }); -}); - -test('Parse MAX Aggregate Query', () => { - const query = 'SELECT MAX(age) FROM student'; - const parsed = parseQuery(query); - expect(parsed).toEqual({ - fields: ['MAX(age)'], - table: 'student', - whereClauses: [], - groupByFields: null, - hasAggregateWithoutGroupBy: true, - "joinCondition": null, - "joinTable": null, - "joinType": null, - "orderByFields": null, - "limit": null, - isDistinct: false - }); -}); - -test('Parse basic GROUP BY query', () => { - const query = 'SELECT age, COUNT(*) FROM student GROUP BY age'; - const parsed = parseQuery(query); - expect(parsed).toEqual({ - fields: ['age', 'COUNT(*)'], - table: 'student', - whereClauses: [], - groupByFields: ['age'], - joinType: null, - joinTable: null, - joinCondition: null, - hasAggregateWithoutGroupBy: false, - orderByFields: null, - "limit": null, - isDistinct: false - }); -}); - -test('Parse GROUP BY query with WHERE clause', () => { - const query = 'SELECT age, COUNT(*) FROM student WHERE age > 22 GROUP BY age'; - const parsed = parseQuery(query); - expect(parsed).toEqual({ - fields: ['age', 'COUNT(*)'], - table: 'student', - whereClauses: [{ field: 'age', operator: '>', value: '22' }], - groupByFields: ['age'], - joinType: null, - joinTable: null, - joinCondition: null, - hasAggregateWithoutGroupBy: false, - orderByFields: null, - "limit": null, - isDistinct: false - }); -}); - -test('Parse GROUP BY query with multiple fields', () => { - const query = 'SELECT student_id, course, COUNT(*) FROM enrollment GROUP BY student_id, course'; - const parsed = parseQuery(query); - expect(parsed).toEqual({ - fields: ['student_id', 'course', 'COUNT(*)'], - table: 'enrollment', - whereClauses: [], - groupByFields: ['student_id', 'course'], - joinType: null, - joinTable: null, - joinCondition: null, - hasAggregateWithoutGroupBy: false, - orderByFields: null, - "limit": null, - isDistinct: false - }); -}); - -test('Parse GROUP BY query with JOIN and WHERE clauses', () => { - const query = 'SELECT student.name, COUNT(*) FROM student INNER JOIN enrollment ON student.id = enrollment.student_id WHERE enrollment.course = "Mathematics" GROUP BY student.name'; - const parsed = parseQuery(query); - expect(parsed).toEqual({ - fields: ['student.name', 'COUNT(*)'], - table: 'student', - whereClauses: [{ field: 'enrollment.course', operator: '=', value: '"Mathematics"' }], - groupByFields: ['student.name'], - joinType: 'INNER', - joinTable: 'enrollment', - joinCondition: { - left: 'student.id', - right: 'enrollment.student_id' - }, - hasAggregateWithoutGroupBy: false, - orderByFields: null, - "limit": null, - isDistinct: false, - }); -}); - -test('Execute SQL Query with ORDER BY', async () => { - const query = 'SELECT name FROM student ORDER BY name ASC'; - const result = await executeSELECTQuery(query); - - expect(result).toStrictEqual([ - { name: 'Alice' }, - { name: 'Bob' }, - { name: 'Jane' }, - { name: 'John' } - ]); -}); - -test('Execute SQL Query with ORDER BY and WHERE', async () => { - const query = 'SELECT name FROM student WHERE age > 24 ORDER BY name DESC'; - const result = await executeSELECTQuery(query); - - expect(result).toStrictEqual([ - { name: 'John' }, - { name: 'Jane' }, - ]); -}); -test('Execute SQL Query with ORDER BY and GROUP BY', async () => { - const query = 'SELECT COUNT(id) as count, age FROM student GROUP BY age ORDER BY age DESC'; - const result = await executeSELECTQuery(query); - - expect(result).toStrictEqual([ - { age: '30', 'COUNT(id) as count': 1 }, - { age: '25', 'COUNT(id) as count': 1 }, - { age: '24', 'COUNT(id) as count': 1 }, - { age: '22', 'COUNT(id) as count': 1 } - ]); -}); - -test('Execute SQL Query with standard LIMIT clause', async () => { - const query = 'SELECT id, name FROM student LIMIT 2'; - const result = await executeSELECTQuery(query); - expect(result.length).toEqual(2); -}); - -test('Execute SQL Query with LIMIT clause equal to total rows', async () => { - const query = 'SELECT id, name FROM student LIMIT 4'; - const result = await executeSELECTQuery(query); - expect(result.length).toEqual(4); -}); - -test('Execute SQL Query with LIMIT clause exceeding total rows', async () => { - const query = 'SELECT id, name FROM student LIMIT 10'; - const result = await executeSELECTQuery(query); - expect(result.length).toEqual(4); // Total rows in student.csv -}); - -test('Execute SQL Query with LIMIT 0', async () => { - const query = 'SELECT id, name FROM student LIMIT 0'; - const result = await executeSELECTQuery(query); - expect(result.length).toEqual(0); -}); - -test('Execute SQL Query with LIMIT and ORDER BY clause', async () => { - const query = 'SELECT id, name FROM student ORDER BY age DESC LIMIT 2'; - const result = await executeSELECTQuery(query); - expect(result.length).toEqual(2); - expect(result[0].name).toEqual('John'); - expect(result[1].name).toEqual('Jane'); -}); - -test('Error Handling with Malformed Query', async () => { - const query = 'SELECT FROM table'; // intentionally malformed - await expect(executeSELECTQuery(query)).rejects.toThrow("Error executing query: Query parsing error: Invalid SELECT format"); -}); - -test('Basic DISTINCT Usage', async () => { - const query = 'SELECT DISTINCT age FROM student'; - const result = await executeSELECTQuery(query); - expect(result).toEqual([{ age: '30' }, { age: '25' }, { age: '22' }, { age: '24' }]); +test("DISTINCT with Multiple Columns", async () => { + const query = "SELECT DISTINCT student_id, course FROM enrollment"; + const result = await executeSELECTQuery(query); + expect(result).toEqual([ + { student_id: "1", course: "Mathematics" }, + { student_id: "1", course: "Physics" }, + { student_id: "2", course: "Chemistry" }, + { student_id: "3", course: "Mathematics" }, + { student_id: "5", course: "Biology" }, + ]); }); -test('DISTINCT with Multiple Columns', async () => { - const query = 'SELECT DISTINCT student_id, course FROM enrollment'; - const result = await executeSELECTQuery(query); - // Expecting unique combinations of student_id and course - expect(result).toEqual([ - { student_id: '1', course: 'Mathematics' }, - { student_id: '1', course: 'Physics' }, - { student_id: '2', course: 'Chemistry' }, - { student_id: '3', course: 'Mathematics' }, - { student_id: '5', course: 'Biology' }, - ]); +test("DISTINCT with WHERE Clause", async () => { + const query = 'SELECT DISTINCT course FROM enrollment WHERE student_id = "1"'; + const result = await executeSELECTQuery(query); + expect(result).toEqual([{ course: "Mathematics" }, { course: "Physics" }]); }); -// Not a good test right now -test('DISTINCT with WHERE Clause', async () => { - const query = 'SELECT DISTINCT course FROM enrollment WHERE student_id = "1"'; - const result = await executeSELECTQuery(query); - // Expecting courses taken by student with ID 1 - expect(result).toEqual([{ course: 'Mathematics' }, { course: 'Physics' }]); +test("DISTINCT with JOIN Operations", async () => { + const query = + "SELECT DISTINCT student.name FROM student INNER JOIN enrollment ON student.id = enrollment.student_id"; + const result = await executeSELECTQuery(query); + expect(result).toEqual([ + { "student.name": "John" }, + { "student.name": "Jane" }, + { "student.name": "Bob" }, + ]); }); -test('DISTINCT with JOIN Operations', async () => { - const query = 'SELECT DISTINCT student.name FROM student INNER JOIN enrollment ON student.id = enrollment.student_id'; - const result = await executeSELECTQuery(query); - // Expecting names of students who are enrolled in any course - expect(result).toEqual([{ "student.name": 'John' }, { "student.name": 'Jane' }, { "student.name": 'Bob' }]); +test("DISTINCT with ORDER BY and LIMIT", async () => { + const query = "SELECT DISTINCT age FROM student ORDER BY age DESC LIMIT 2"; + const result = await executeSELECTQuery(query); + expect(result).toEqual([{ age: "30" }, { age: "25" }]); }); -test('DISTINCT with ORDER BY and LIMIT', async () => { - const query = 'SELECT DISTINCT age FROM student ORDER BY age DESC LIMIT 2'; - const result = await executeSELECTQuery(query); - // Expecting the two highest unique ages - expect(result).toEqual([{ age: '30' }, { age: '25' }]); +test("Execute SQL Query with LIKE Operator for Name", async () => { + const query = "SELECT name FROM student WHERE name LIKE '%Jane%'"; + const result = await executeSELECTQuery(query); + expect(result).toEqual([{ name: "Jane" }]); }); -test('Execute SQL Query with LIKE Operator for Name', async () => { - const query = "SELECT name FROM student WHERE name LIKE '%Jane%'"; - const result = await executeSELECTQuery(query); - // Expecting names containing 'Jane' - expect(result).toEqual([{ name: 'Jane' }]); +test("Execute SQL Query with LIKE Operator and Wildcards", async () => { + const query = "SELECT name FROM student WHERE name LIKE 'J%'"; + const result = await executeSELECTQuery(query); + expect(result).toEqual([{ name: "John" }, { name: "Jane" }]); }); -test('Execute SQL Query with LIKE Operator and Wildcards', async () => { - const query = "SELECT name FROM student WHERE name LIKE 'J%'"; - const result = await executeSELECTQuery(query); - // Expecting names starting with 'J' - expect(result).toEqual([{ name: 'John' }, { name: 'Jane' }]); +test("Execute SQL Query with LIKE Operator Case Insensitive", async () => { + const query = "SELECT name FROM student WHERE name LIKE '%bob%'"; + const result = await executeSELECTQuery(query); + expect(result).toEqual([{ name: "Bob" }]); }); -test('Execute SQL Query with LIKE Operator Case Insensitive', async () => { - const query = "SELECT name FROM student WHERE name LIKE '%bob%'"; - const result = await executeSELECTQuery(query); - // Expecting names 'Bob' (case insensitive) - expect(result).toEqual([{ name: 'Bob' }]); +test("Execute SQL Query with LIKE Operator and DISTINCT", async () => { + const query = "SELECT DISTINCT name FROM student WHERE name LIKE '%e%'"; + const result = await executeSELECTQuery(query); + expect(result).toEqual([{ name: "Jane" }, { name: "Alice" }]); }); -test('Execute SQL Query with LIKE Operator and DISTINCT', async () => { - const query = "SELECT DISTINCT name FROM student WHERE name LIKE '%e%'"; - const result = await executeSELECTQuery(query); - // Expecting unique names containing 'e' - expect(result).toEqual([{ name: 'Jane' }, { name: 'Alice' }]); +test("LIKE with ORDER BY and LIMIT", async () => { + const query = + "SELECT name FROM student WHERE name LIKE '%a%' ORDER BY name ASC LIMIT 2"; + const result = await executeSELECTQuery(query); + expect(result).toEqual([{ name: "Alice" }, { name: "Jane" }]); }); - -test('LIKE with ORDER BY and LIMIT', async () => { - const query = "SELECT name FROM student WHERE name LIKE '%a%' ORDER BY name ASC LIMIT 2"; - const result = await executeSELECTQuery(query); - // Expecting the first two names alphabetically that contain 'a' - expect(result).toEqual([{ name: 'Alice' }, { name: 'Jane' }]); -}); \ No newline at end of file diff --git a/tests/step-17/index.test.js b/tests/step-17/index.test.js index c99d01fbb..90a665f61 100644 --- a/tests/step-17/index.test.js +++ b/tests/step-17/index.test.js @@ -1,822 +1,867 @@ -const {readCSV} = require('../../src/csvReader'); -const {executeSELECTQuery } = require('../../src/index'); -const { parseJoinClause, parseSelectQuery } = require('../../src/queryParser'); - -test('Read CSV File', async () => { - const data = await readCSV('./student.csv'); - expect(data.length).toBeGreaterThan(0); - expect(data.length).toBe(4); - expect(data[0].name).toBe('John'); - expect(data[0].age).toBe('30'); //ignore the string type here, we will fix this later -}); - -test('Execute SQL Query', async () => { - const query = 'SELECT id, name FROM student'; - const result = await executeSELECTQuery(query); - expect(result.length).toBeGreaterThan(0); - expect(result[0]).toHaveProperty('id'); - expect(result[0]).toHaveProperty('name'); - expect(result[0]).not.toHaveProperty('age'); - expect(result[0]).toEqual({ id: '1', name: 'John' }); -}); - -test('Execute SQL Query with WHERE Clause', async () => { - const query = 'SELECT id, name FROM student WHERE age = 25'; - const result = await executeSELECTQuery(query); - expect(result.length).toBe(1); - expect(result[0]).toHaveProperty('id'); - expect(result[0]).toHaveProperty('name'); - expect(result[0].id).toBe('2'); -}); - -test('Execute SQL Query with Complex WHERE Clause', async () => { - const query = 'SELECT id, name FROM student WHERE age = 30 AND name = John'; - const result = await executeSELECTQuery(query); - expect(result.length).toBe(1); - expect(result[0]).toEqual({ id: '1', name: 'John' }); -}); - -test('Execute SQL Query with Greater Than', async () => { - const queryWithGT = 'SELECT id FROM student WHERE age > 22'; - const result = await executeSELECTQuery(queryWithGT); - expect(result.length).toEqual(3); - expect(result[0]).toHaveProperty('id'); -}); - -test('Execute SQL Query with Not Equal to', async () => { - const queryWithGT = 'SELECT name FROM student WHERE age != 25'; - const result = await executeSELECTQuery(queryWithGT); - expect(result.length).toEqual(3); - expect(result[0]).toHaveProperty('name'); -}); - -test('Execute SQL Query with INNER JOIN', async () => { - const query = 'SELECT student.name, enrollment.course FROM student INNER JOIN enrollment ON student.id=enrollment.student_id'; - const result = await executeSELECTQuery(query); - /* - result = [ - { 'student.name': 'John', 'enrollment.course': 'Mathematics' }, - { 'student.name': 'John', 'enrollment.course': 'Physics' }, - { 'student.name': 'Jane', 'enrollment.course': 'Chemistry' }, - { 'student.name': 'Bob', 'enrollment.course': 'Mathematics' } - ] - */ - expect(result.length).toEqual(4); - // toHaveProperty is not working here due to dot in the property name - expect(result[0]).toEqual(expect.objectContaining({ +const { readCSV } = require("../../src/csvReader"); +const { executeSELECTQuery } = require("../../src/queryExecutor"); +const { parseJoinClause, parseSelectQuery } = require("../../src/queryParser"); + +test("Read CSV File", async () => { + const data = await readCSV("./student.csv"); + expect(data.length).toBeGreaterThan(0); + expect(data.length).toBe(4); + expect(data[0].name).toBe("John"); + expect(data[0].age).toBe("30"); +}); + +test("Execute SQL Query", async () => { + const query = "SELECT id, name FROM student"; + const result = await executeSELECTQuery(query); + expect(result.length).toBeGreaterThan(0); + expect(result[0]).toHaveProperty("id"); + expect(result[0]).toHaveProperty("name"); + expect(result[0]).not.toHaveProperty("age"); + expect(result[0]).toEqual({ id: "1", name: "John" }); +}); + +test("Execute SQL Query with WHERE Clause", async () => { + const query = "SELECT id, name FROM student WHERE age = 25"; + const result = await executeSELECTQuery(query); + expect(result.length).toBe(1); + expect(result[0]).toHaveProperty("id"); + expect(result[0]).toHaveProperty("name"); + expect(result[0].id).toBe("2"); +}); + +test("Execute SQL Query with Complex WHERE Clause", async () => { + const query = "SELECT id, name FROM student WHERE age = 30 AND name = John"; + const result = await executeSELECTQuery(query); + expect(result.length).toBe(1); + expect(result[0]).toEqual({ id: "1", name: "John" }); +}); + +test("Execute SQL Query with Greater Than", async () => { + const queryWithGT = "SELECT id FROM student WHERE age > 22"; + const result = await executeSELECTQuery(queryWithGT); + expect(result.length).toEqual(3); + expect(result[0]).toHaveProperty("id"); +}); + +test("Execute SQL Query with Not Equal to", async () => { + const queryWithGT = "SELECT name FROM student WHERE age != 25"; + const result = await executeSELECTQuery(queryWithGT); + expect(result.length).toEqual(3); + expect(result[0]).toHaveProperty("name"); +}); + +test("Execute SQL Query with INNER JOIN", async () => { + const query = + "SELECT student.name, enrollment.course FROM student INNER JOIN enrollment ON student.id=enrollment.student_id"; + const result = await executeSELECTQuery(query); + + expect(result.length).toEqual(4); + expect(result[0]).toEqual( + expect.objectContaining({ + "enrollment.course": "Mathematics", + "student.name": "John", + }) + ); +}); + +test("Execute SQL Query with INNER JOIN and a WHERE Clause", async () => { + const query = + "SELECT student.name, enrollment.course, student.age FROM student INNER JOIN enrollment ON student.id = enrollment.student_id WHERE student.age > 25"; + const result = await executeSELECTQuery(query); + expect(result.length).toEqual(2); + expect(result[0]).toEqual( + expect.objectContaining({ + "enrollment.course": "Mathematics", + "student.name": "John", + }) + ); +}); + +test("Execute SQL Query with LEFT JOIN", async () => { + const query = + "SELECT student.name, enrollment.course FROM student LEFT JOIN enrollment ON student.id=enrollment.student_id"; + const result = await executeSELECTQuery(query); + expect(result).toEqual( + expect.arrayContaining([ + expect.objectContaining({ + "student.name": "Alice", + "enrollment.course": null, + }), + expect.objectContaining({ + "student.name": "John", "enrollment.course": "Mathematics", - "student.name": "John" - })); -}); - -test('Execute SQL Query with INNER JOIN and a WHERE Clause', async () => { - const query = 'SELECT student.name, enrollment.course, student.age FROM student INNER JOIN enrollment ON student.id = enrollment.student_id WHERE student.age > 25'; - const result = await executeSELECTQuery(query); - /* - result = [ + }), + ]) + ); + expect(result.length).toEqual(5); +}); + +test("Execute SQL Query with RIGHT JOIN", async () => { + const query = + "SELECT student.name, enrollment.course FROM student RIGHT JOIN enrollment ON student.id=enrollment.student_id"; + const result = await executeSELECTQuery(query); + expect(result).toEqual( + expect.arrayContaining([ + expect.objectContaining({ + "student.name": null, + "enrollment.course": "Biology", + }), + expect.objectContaining({ + "student.name": "John", + "enrollment.course": "Mathematics", + }), + ]) + ); + expect(result.length).toEqual(5); +}); + +test("Execute SQL Query with LEFT JOIN with a WHERE clause filtering the main table", async () => { + const query = + "SELECT student.name, enrollment.course FROM student LEFT JOIN enrollment ON student.id=enrollment.student_id WHERE student.age > 22"; + const result = await executeSELECTQuery(query); + expect(result).toEqual( + expect.arrayContaining([ + expect.objectContaining({ + "enrollment.course": "Mathematics", + "student.name": "John", + }), + expect.objectContaining({ + "enrollment.course": "Physics", + "student.name": "John", + }), + ]) + ); + expect(result.length).toEqual(4); +}); + +test("Execute SQL Query with LEFT JOIN with a WHERE clause filtering the join table", async () => { + const query = `SELECT student.name, enrollment.course FROM student LEFT JOIN enrollment ON student.id=enrollment.student_id WHERE enrollment.course = 'Physics'`; + const result = await executeSELECTQuery(query); + expect(result).toEqual( + expect.arrayContaining([ + expect.objectContaining({ + "student.name": "John", + "enrollment.course": "Physics", + }), + ]) + ); + expect(result.length).toEqual(1); +}); + +test("Execute SQL Query with RIGHT JOIN with a WHERE clause filtering the main table", async () => { + const query = + "SELECT student.name, enrollment.course FROM student RIGHT JOIN enrollment ON student.id=enrollment.student_id WHERE student.age < 25"; + const result = await executeSELECTQuery(query); + expect(result).toEqual( + expect.arrayContaining([ + expect.objectContaining({ + "enrollment.course": "Mathematics", + "student.name": "Bob", + }), + expect.objectContaining({ + "enrollment.course": "Biology", + "student.name": null, + }), + ]) + ); + expect(result.length).toEqual(2); +}); + +test("Execute SQL Query with RIGHT JOIN with a WHERE clause filtering the join table", async () => { + const query = `SELECT student.name, enrollment.course FROM student RIGHT JOIN enrollment ON student.id=enrollment.student_id WHERE enrollment.course = 'Chemistry'`; + const result = await executeSELECTQuery(query); + expect(result).toEqual( + expect.arrayContaining([ + expect.objectContaining({ + "enrollment.course": "Chemistry", + "student.name": "Jane", + }), + ]) + ); + expect(result.length).toEqual(1); +}); + +test("Execute SQL Query with RIGHT JOIN with a multiple WHERE clauses filtering the join table and main table", async () => { + const query = `SELECT student.name, enrollment.course FROM student RIGHT JOIN enrollment ON student.id=enrollment.student_id WHERE enrollment.course = 'Chemistry' AND student.age = 26`; + const result = await executeSELECTQuery(query); + expect(result).toEqual([]); +}); + +test("Execute COUNT Aggregate Query", async () => { + const query = "SELECT COUNT(*) FROM student"; + const result = await executeSELECTQuery(query); + expect(result).toEqual([{ "COUNT(*)": 4 }]); +}); + +test("Execute SUM Aggregate Query", async () => { + const query = "SELECT SUM(age) FROM student"; + const result = await executeSELECTQuery(query); + expect(result).toEqual([{ "SUM(age)": 101 }]); +}); + +test("Execute AVG Aggregate Query", async () => { + const query = "SELECT AVG(age) FROM student"; + const result = await executeSELECTQuery(query); + // Assuming AVG returns a single decimal point value + expect(result).toEqual([{ "AVG(age)": 25.25 }]); +}); + +test("Execute MIN Aggregate Query", async () => { + const query = "SELECT MIN(age) FROM student"; + const result = await executeSELECTQuery(query); + expect(result).toEqual([{ "MIN(age)": 22 }]); +}); + +test("Execute MAX Aggregate Query", async () => { + const query = "SELECT MAX(age) FROM student"; + const result = await executeSELECTQuery(query); + expect(result).toEqual([{ "MAX(age)": 30 }]); +}); + +test("Count students per age", async () => { + const query = "SELECT age, COUNT(*) FROM student GROUP BY age"; + const result = await executeSELECTQuery(query); + expect(result).toEqual([ + { age: "22", "COUNT(*)": 1 }, + { age: "24", "COUNT(*)": 1 }, + { age: "25", "COUNT(*)": 1 }, + { age: "30", "COUNT(*)": 1 }, + ]); +}); + +test("Count enrollments per course", async () => { + const query = "SELECT course, COUNT(*) FROM enrollment GROUP BY course"; + const result = await executeSELECTQuery(query); + expect(result).toEqual([ + { course: "Mathematics", "COUNT(*)": 2 }, + { course: "Physics", "COUNT(*)": 1 }, + { course: "Chemistry", "COUNT(*)": 1 }, + { course: "Biology", "COUNT(*)": 1 }, + ]); +}); + +test("Count courses per student", async () => { + const query = + "SELECT student_id, COUNT(*) FROM enrollment GROUP BY student_id"; + const result = await executeSELECTQuery(query); + expect(result).toEqual([ + { student_id: "1", "COUNT(*)": 2 }, + { student_id: "2", "COUNT(*)": 1 }, + { student_id: "3", "COUNT(*)": 1 }, + { student_id: "5", "COUNT(*)": 1 }, + ]); +}); + +test("Count students within a specific age range", async () => { + const query = "SELECT age, COUNT(*) FROM student WHERE age > 22 GROUP BY age"; + const result = await executeSELECTQuery(query); + expect(result).toEqual([ + { age: "24", "COUNT(*)": 1 }, + { age: "25", "COUNT(*)": 1 }, + { age: "30", "COUNT(*)": 1 }, + ]); +}); + +test("Count enrollments for a specific course", async () => { + const query = + 'SELECT course, COUNT(*) FROM enrollment WHERE course = "Mathematics" GROUP BY course'; + const result = await executeSELECTQuery(query); + expect(result).toEqual([{ course: "Mathematics", "COUNT(*)": 2 }]); +}); + +test("Count courses for a specific student", async () => { + const query = + "SELECT student_id, COUNT(*) FROM enrollment WHERE student_id = 1 GROUP BY student_id"; + const result = await executeSELECTQuery(query); + expect(result).toEqual([{ student_id: "1", "COUNT(*)": 2 }]); +}); + +test("Average age of students above a certain age", async () => { + const query = "SELECT AVG(age) FROM student WHERE age > 22"; + const result = await executeSELECTQuery(query); + const expectedAverage = (25 + 30 + 24) / 3; // Average age of students older than 22 + expect(result).toEqual([{ "AVG(age)": expectedAverage }]); +}); + +test("Parse SQL Query", () => { + const query = "SELECT id, name FROM student"; + const parsed = parseSelectQuery(query); + expect(parsed).toEqual({ + fields: ["id", "name"], + table: "student", + whereClauses: [], + joinCondition: null, + joinTable: null, + joinType: null, + groupByFields: null, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse SQL Query with WHERE Clause", () => { + const query = "SELECT id, name FROM student WHERE age = 25"; + const parsed = parseSelectQuery(query); + expect(parsed).toEqual({ + fields: ["id", "name"], + table: "student", + whereClauses: [ { - 'student.name': 'John', - 'enrollment.course': 'Mathematics', - 'student.age': '30' + field: "age", + operator: "=", + value: "25", }, + ], + joinCondition: null, + joinTable: null, + joinType: null, + groupByFields: null, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse SQL Query with Multiple WHERE Clauses", () => { + const query = "SELECT id, name FROM student WHERE age = 30 AND name = John"; + const parsed = parseSelectQuery(query); + expect(parsed).toEqual({ + fields: ["id", "name"], + table: "student", + whereClauses: [ { - 'student.name': 'John', - 'enrollment.course': 'Physics', - 'student.age': '30' - } - ] - */ - expect(result.length).toEqual(2); - // toHaveProperty is not working here due to dot in the property name - expect(result[0]).toEqual(expect.objectContaining({ - "enrollment.course": "Mathematics", - "student.name": "John" - })); -}); - -test('Execute SQL Query with LEFT JOIN', async () => { - const query = 'SELECT student.name, enrollment.course FROM student LEFT JOIN enrollment ON student.id=enrollment.student_id'; - const result = await executeSELECTQuery(query); - expect(result).toEqual(expect.arrayContaining([ - expect.objectContaining({ "student.name": "Alice", "enrollment.course": null }), - expect.objectContaining({ "student.name": "John", "enrollment.course": "Mathematics" }) - ])); - expect(result.length).toEqual(5); // 4 students, but John appears twice -}); - -test('Execute SQL Query with RIGHT JOIN', async () => { - const query = 'SELECT student.name, enrollment.course FROM student RIGHT JOIN enrollment ON student.id=enrollment.student_id'; - const result = await executeSELECTQuery(query); - expect(result).toEqual(expect.arrayContaining([ - expect.objectContaining({ "student.name": null, "enrollment.course": "Biology" }), - expect.objectContaining({ "student.name": "John", "enrollment.course": "Mathematics" }) - ])); - expect(result.length).toEqual(5); // 4 courses, but Mathematics appears twice -}); - -test('Execute SQL Query with LEFT JOIN with a WHERE clause filtering the main table', async () => { - const query = 'SELECT student.name, enrollment.course FROM student LEFT JOIN enrollment ON student.id=enrollment.student_id WHERE student.age > 22'; - const result = await executeSELECTQuery(query); - expect(result).toEqual(expect.arrayContaining([ - expect.objectContaining({ "enrollment.course": "Mathematics", "student.name": "John" }), - expect.objectContaining({ "enrollment.course": "Physics", "student.name": "John" }) - ])); - expect(result.length).toEqual(4); -}); - -test('Execute SQL Query with LEFT JOIN with a WHERE clause filtering the join table', async () => { - const query = `SELECT student.name, enrollment.course FROM student LEFT JOIN enrollment ON student.id=enrollment.student_id WHERE enrollment.course = 'Physics'`; - const result = await executeSELECTQuery(query); - expect(result).toEqual(expect.arrayContaining([ - expect.objectContaining({ "student.name": "John", "enrollment.course": "Physics" }) - ])); - expect(result.length).toEqual(1); -}); - -test('Execute SQL Query with RIGHT JOIN with a WHERE clause filtering the main table', async () => { - const query = 'SELECT student.name, enrollment.course FROM student RIGHT JOIN enrollment ON student.id=enrollment.student_id WHERE student.age < 25'; - const result = await executeSELECTQuery(query); - expect(result).toEqual(expect.arrayContaining([ - expect.objectContaining({ "enrollment.course": "Mathematics", "student.name": "Bob" }), - expect.objectContaining({ "enrollment.course": "Biology", "student.name": null }) - ])); - expect(result.length).toEqual(2); -}); - -test('Execute SQL Query with RIGHT JOIN with a WHERE clause filtering the join table', async () => { - const query = `SELECT student.name, enrollment.course FROM student RIGHT JOIN enrollment ON student.id=enrollment.student_id WHERE enrollment.course = 'Chemistry'`; - const result = await executeSELECTQuery(query); - expect(result).toEqual(expect.arrayContaining([ - expect.objectContaining({ "enrollment.course": "Chemistry", "student.name": "Jane" }), - ])); - expect(result.length).toEqual(1); -}); - -test('Execute SQL Query with RIGHT JOIN with a multiple WHERE clauses filtering the join table and main table', async () => { - const query = `SELECT student.name, enrollment.course FROM student RIGHT JOIN enrollment ON student.id=enrollment.student_id WHERE enrollment.course = 'Chemistry' AND student.age = 26`; - const result = await executeSELECTQuery(query); - expect(result).toEqual([]); -}); - -test('Execute COUNT Aggregate Query', async () => { - const query = 'SELECT COUNT(*) FROM student'; - const result = await executeSELECTQuery(query); - expect(result).toEqual([{ 'COUNT(*)': 4 }]); -}); - -test('Execute SUM Aggregate Query', async () => { - const query = 'SELECT SUM(age) FROM student'; - const result = await executeSELECTQuery(query); - expect(result).toEqual([{ 'SUM(age)': 101 }]); -}); - -test('Execute AVG Aggregate Query', async () => { - const query = 'SELECT AVG(age) FROM student'; - const result = await executeSELECTQuery(query); - // Assuming AVG returns a single decimal point value - expect(result).toEqual([{ 'AVG(age)': 25.25 }]); -}); - -test('Execute MIN Aggregate Query', async () => { - const query = 'SELECT MIN(age) FROM student'; - const result = await executeSELECTQuery(query); - expect(result).toEqual([{ 'MIN(age)': 22 }]); -}); - -test('Execute MAX Aggregate Query', async () => { - const query = 'SELECT MAX(age) FROM student'; - const result = await executeSELECTQuery(query); - expect(result).toEqual([{ 'MAX(age)': 30 }]); -}); - -test('Count students per age', async () => { - const query = 'SELECT age, COUNT(*) FROM student GROUP BY age'; - const result = await executeSELECTQuery(query); - expect(result).toEqual([ - { age: '22', 'COUNT(*)': 1 }, - { age: '24', 'COUNT(*)': 1 }, - { age: '25', 'COUNT(*)': 1 }, - { age: '30', 'COUNT(*)': 1 } - ]); -}); - -test('Count enrollments per course', async () => { - const query = 'SELECT course, COUNT(*) FROM enrollment GROUP BY course'; - const result = await executeSELECTQuery(query); - expect(result).toEqual([ - { course: 'Mathematics', 'COUNT(*)': 2 }, - { course: 'Physics', 'COUNT(*)': 1 }, - { course: 'Chemistry', 'COUNT(*)': 1 }, - { course: 'Biology', 'COUNT(*)': 1 } - ]); -}); - - -test('Count courses per student', async () => { - const query = 'SELECT student_id, COUNT(*) FROM enrollment GROUP BY student_id'; - const result = await executeSELECTQuery(query); - expect(result).toEqual([ - { student_id: '1', 'COUNT(*)': 2 }, - { student_id: '2', 'COUNT(*)': 1 }, - { student_id: '3', 'COUNT(*)': 1 }, - { student_id: '5', 'COUNT(*)': 1 } - ]); -}); - -test('Count students within a specific age range', async () => { - const query = 'SELECT age, COUNT(*) FROM student WHERE age > 22 GROUP BY age'; - const result = await executeSELECTQuery(query); - expect(result).toEqual([ - { age: '24', 'COUNT(*)': 1 }, - { age: '25', 'COUNT(*)': 1 }, - { age: '30', 'COUNT(*)': 1 } - ]); -}); - -test('Count enrollments for a specific course', async () => { - const query = 'SELECT course, COUNT(*) FROM enrollment WHERE course = "Mathematics" GROUP BY course'; - const result = await executeSELECTQuery(query); - expect(result).toEqual([ - { course: 'Mathematics', 'COUNT(*)': 2 } - ]); -}); - -test('Count courses for a specific student', async () => { - const query = 'SELECT student_id, COUNT(*) FROM enrollment WHERE student_id = 1 GROUP BY student_id'; - const result = await executeSELECTQuery(query); - expect(result).toEqual([ - { student_id: '1', 'COUNT(*)': 2 } - ]); -}); - -test('Average age of students above a certain age', async () => { - const query = 'SELECT AVG(age) FROM student WHERE age > 22'; - const result = await executeSELECTQuery(query); - const expectedAverage = (25 + 30 + 24) / 3; // Average age of students older than 22 - expect(result).toEqual([{ 'AVG(age)': expectedAverage }]); -}); - -test('Parse SQL Query', () => { - const query = 'SELECT id, name FROM student'; - const parsed = parseSelectQuery(query); - expect(parsed).toEqual({ - fields: ['id', 'name'], - table: 'student', - whereClauses: [], - joinCondition: null, - joinTable: null, - joinType: null, - groupByFields: null, - hasAggregateWithoutGroupBy: false, - "orderByFields": null, - "limit": null, - isDistinct: false - }); -}); - -test('Parse SQL Query with WHERE Clause', () => { - const query = 'SELECT id, name FROM student WHERE age = 25'; - const parsed = parseSelectQuery(query); - expect(parsed).toEqual({ - fields: ['id', 'name'], - table: 'student', - whereClauses: [{ - "field": "age", - "operator": "=", - "value": "25", - }], - joinCondition: null, - joinTable: null, - joinType: null, - groupByFields: null, - hasAggregateWithoutGroupBy: false, - "orderByFields": null, - "limit": null, - isDistinct: false - }); -}); - -test('Parse SQL Query with Multiple WHERE Clauses', () => { - const query = 'SELECT id, name FROM student WHERE age = 30 AND name = John'; - const parsed = parseSelectQuery(query); - expect(parsed).toEqual({ - fields: ['id', 'name'], - table: 'student', - whereClauses: [{ - "field": "age", - "operator": "=", - "value": "30", - }, { - "field": "name", - "operator": "=", - "value": "John", - }], - joinCondition: null, - joinTable: null, - joinType: null, - groupByFields: null, - hasAggregateWithoutGroupBy: false, - "orderByFields": null, - "limit": null, - isDistinct: false - }); -}); - -test('Parse SQL Query with INNER JOIN', async () => { - const query = 'SELECT student.name, enrollment.course FROM student INNER JOIN enrollment ON student.id=enrollment.student_id'; - const result = await parseSelectQuery(query); - expect(result).toEqual({ - fields: ['student.name', 'enrollment.course'], - table: 'student', - whereClauses: [], - joinTable: 'enrollment', - joinType: "INNER", - joinCondition: { left: 'student.id', right: 'enrollment.student_id' }, - groupByFields: null, - hasAggregateWithoutGroupBy: false, - "orderByFields": null, - "limit": null, - isDistinct: false - }) -}); - -test('Parse SQL Query with INNER JOIN and WHERE Clause', async () => { - const query = 'SELECT student.name, enrollment.course FROM student INNER JOIN enrollment ON student.id = enrollment.student_id WHERE student.age > 20'; - const result = await parseSelectQuery(query); - expect(result).toEqual({ - fields: ['student.name', 'enrollment.course'], - table: 'student', - whereClauses: [{ field: 'student.age', operator: '>', value: '20' }], - joinTable: 'enrollment', - joinType: "INNER", - joinCondition: { left: 'student.id', right: 'enrollment.student_id' }, - groupByFields: null, - hasAggregateWithoutGroupBy: false, - "orderByFields": null, - "limit": null, - isDistinct: false - }) -}); - -test('Parse INNER JOIN clause', () => { - const query = 'SELECT * FROM table1 INNER JOIN table2 ON table1.id = table2.ref_id'; - const result = parseJoinClause(query); - expect(result).toEqual({ - joinType: 'INNER', - joinTable: 'table2', - joinCondition: { left: 'table1.id', right: 'table2.ref_id' }, - }); -}); - -test('Parse LEFT JOIN clause', () => { - const query = 'SELECT * FROM table1 LEFT JOIN table2 ON table1.id = table2.ref_id'; - const result = parseJoinClause(query); - expect(result).toEqual({ - joinType: 'LEFT', - joinTable: 'table2', - joinCondition: { left: 'table1.id', right: 'table2.ref_id' } - }); -}); - -test('Parse RIGHT JOIN clause', () => { - const query = 'SELECT * FROM table1 RIGHT JOIN table2 ON table1.id = table2.ref_id'; - const result = parseJoinClause(query); - expect(result).toEqual({ - joinType: 'RIGHT', - joinTable: 'table2', - joinCondition: { left: 'table1.id', right: 'table2.ref_id' } - }); -}); - -test('Returns null for queries without JOIN', () => { - const query = 'SELECT * FROM table1'; - const result = parseJoinClause(query); - expect(result).toEqual( - { - joinType: null, - joinTable: null, - joinCondition: null - } - ); -}); - -test('Parse LEFT Join Query Completely', () => { - const query = 'SELECT student.name, enrollment.course FROM student LEFT JOIN enrollment ON student.id=enrollment.student_id'; - const result = parseSelectQuery(query); - expect(result).toEqual({ - fields: ['student.name', 'enrollment.course'], - table: 'student', - whereClauses: [], - joinType: 'LEFT', - joinTable: 'enrollment', - joinCondition: { left: 'student.id', right: 'enrollment.student_id' }, - groupByFields: null, - hasAggregateWithoutGroupBy: false, - "orderByFields": null, - "limit": null, - isDistinct: false - }) -}) - -test('Parse LEFT Join Query Completely', () => { - const query = 'SELECT student.name, enrollment.course FROM student RIGHT JOIN enrollment ON student.id=enrollment.student_id'; - const result = parseSelectQuery(query); - expect(result).toEqual({ - fields: ['student.name', 'enrollment.course'], - table: 'student', - whereClauses: [], - joinType: 'RIGHT', - joinTable: 'enrollment', - joinCondition: { left: 'student.id', right: 'enrollment.student_id' }, - groupByFields: null, - hasAggregateWithoutGroupBy: false, - "orderByFields": null, - "limit": null, - isDistinct: false - }) -}) - -test('Parse SQL Query with LEFT JOIN with a WHERE clause filtering the main table', async () => { - const query = 'SELECT student.name, enrollment.course FROM student LEFT JOIN enrollment ON student.id=enrollment.student_id WHERE student.age > 22'; - const result = await parseSelectQuery(query); - expect(result).toEqual({ - "fields": ["student.name", "enrollment.course"], - "joinCondition": { "left": "student.id", "right": "enrollment.student_id" }, - "joinTable": "enrollment", - "joinType": "LEFT", - "table": "student", - "whereClauses": [{ "field": "student.age", "operator": ">", "value": "22" }], - groupByFields: null, - hasAggregateWithoutGroupBy: false, - "orderByFields": null, - "limit": null, - isDistinct: false - }); -}); - -test('Parse SQL Query with LEFT JOIN with a WHERE clause filtering the join table', async () => { - const query = `SELECT student.name, enrollment.course FROM student LEFT JOIN enrollment ON student.id=enrollment.student_id WHERE enrollment.course = 'Physics'`; - const result = await parseSelectQuery(query); - expect(result).toEqual({ - "fields": ["student.name", "enrollment.course"], - "joinCondition": { "left": "student.id", "right": "enrollment.student_id" }, - "joinTable": "enrollment", - "joinType": "LEFT", - "table": "student", - "whereClauses": [{ "field": "enrollment.course", "operator": "=", "value": "'Physics'" }], - groupByFields: null, - hasAggregateWithoutGroupBy: false, - "orderByFields": null, - "limit": null, - isDistinct: false - }); -}); - -test('Parse SQL Query with RIGHT JOIN with a WHERE clause filtering the main table', async () => { - const query = 'SELECT student.name, enrollment.course FROM student RIGHT JOIN enrollment ON student.id=enrollment.student_id WHERE student.age < 25'; - const result = await parseSelectQuery(query); - expect(result).toEqual({ - "fields": ["student.name", "enrollment.course"], - "joinCondition": { "left": "student.id", "right": "enrollment.student_id" }, - "joinTable": "enrollment", - "joinType": "RIGHT", - "table": "student", - "whereClauses": [{ "field": "student.age", "operator": "<", "value": "25" }], - groupByFields: null, - hasAggregateWithoutGroupBy: false, - "orderByFields": null, - "limit": null, - isDistinct: false - }); -}); - -test('Parse SQL Query with RIGHT JOIN with a WHERE clause filtering the join table', async () => { - const query = `SELECT student.name, enrollment.course FROM student RIGHT JOIN enrollment ON student.id=enrollment.student_id WHERE enrollment.course = 'Chemistry'`; - const result = await parseSelectQuery(query); - expect(result).toEqual({ - "fields": ["student.name", "enrollment.course"], - "joinCondition": { "left": "student.id", "right": "enrollment.student_id" }, - "joinTable": "enrollment", - "joinType": "RIGHT", - "table": "student", - "whereClauses": [{ "field": "enrollment.course", "operator": "=", "value": "'Chemistry'" }], - groupByFields: null, - hasAggregateWithoutGroupBy: false, - "orderByFields": null, - "limit": null, - isDistinct: false - }); -}); - - -test('Parse COUNT Aggregate Query', () => { - const query = 'SELECT COUNT(*) FROM student'; - const parsed = parseSelectQuery(query); - expect(parsed).toEqual({ - fields: ['COUNT(*)'], - table: 'student', - whereClauses: [], - groupByFields: null, - hasAggregateWithoutGroupBy: true, - "joinCondition": null, - "joinTable": null, - "joinType": null, - "orderByFields": null, - "limit": null, - isDistinct: false - }); -}); - - -test('Parse SUM Aggregate Query', () => { - const query = 'SELECT SUM(age) FROM student'; - const parsed = parseSelectQuery(query); - expect(parsed).toEqual({ - fields: ['SUM(age)'], - table: 'student', - whereClauses: [], - groupByFields: null, - hasAggregateWithoutGroupBy: true, - "joinCondition": null, - "joinTable": null, - "joinType": null, - "orderByFields": null, - "limit": null, - isDistinct: false - }); -}); - -test('Parse AVG Aggregate Query', () => { - const query = 'SELECT AVG(age) FROM student'; - const parsed = parseSelectQuery(query); - expect(parsed).toEqual({ - fields: ['AVG(age)'], - table: 'student', - whereClauses: [], - groupByFields: null, - hasAggregateWithoutGroupBy: true, - "joinCondition": null, - "joinTable": null, - "joinType": null, - "orderByFields": null, - "limit": null, - isDistinct: false - }); -}); - -test('Parse MIN Aggregate Query', () => { - const query = 'SELECT MIN(age) FROM student'; - const parsed = parseSelectQuery(query); - expect(parsed).toEqual({ - fields: ['MIN(age)'], - table: 'student', - whereClauses: [], - groupByFields: null, - hasAggregateWithoutGroupBy: true, - "joinCondition": null, - "joinTable": null, - "joinType": null, - "orderByFields": null, - "limit": null, - isDistinct: false - }); -}); - -test('Parse MAX Aggregate Query', () => { - const query = 'SELECT MAX(age) FROM student'; - const parsed = parseSelectQuery(query); - expect(parsed).toEqual({ - fields: ['MAX(age)'], - table: 'student', - whereClauses: [], - groupByFields: null, - hasAggregateWithoutGroupBy: true, - "joinCondition": null, - "joinTable": null, - "joinType": null, - "orderByFields": null, - "limit": null, - isDistinct: false - }); -}); - -test('Parse basic GROUP BY query', () => { - const query = 'SELECT age, COUNT(*) FROM student GROUP BY age'; - const parsed = parseSelectQuery(query); - expect(parsed).toEqual({ - fields: ['age', 'COUNT(*)'], - table: 'student', - whereClauses: [], - groupByFields: ['age'], - joinType: null, - joinTable: null, - joinCondition: null, - hasAggregateWithoutGroupBy: false, - orderByFields: null, - "limit": null, - isDistinct: false - }); -}); - -test('Parse GROUP BY query with WHERE clause', () => { - const query = 'SELECT age, COUNT(*) FROM student WHERE age > 22 GROUP BY age'; - const parsed = parseSelectQuery(query); - expect(parsed).toEqual({ - fields: ['age', 'COUNT(*)'], - table: 'student', - whereClauses: [{ field: 'age', operator: '>', value: '22' }], - groupByFields: ['age'], - joinType: null, - joinTable: null, - joinCondition: null, - hasAggregateWithoutGroupBy: false, - orderByFields: null, - "limit": null, - isDistinct: false - }); -}); - -test('Parse GROUP BY query with multiple fields', () => { - const query = 'SELECT student_id, course, COUNT(*) FROM enrollment GROUP BY student_id, course'; - const parsed = parseSelectQuery(query); - expect(parsed).toEqual({ - fields: ['student_id', 'course', 'COUNT(*)'], - table: 'enrollment', - whereClauses: [], - groupByFields: ['student_id', 'course'], - joinType: null, - joinTable: null, - joinCondition: null, - hasAggregateWithoutGroupBy: false, - orderByFields: null, - "limit": null, - isDistinct: false - }); -}); - -test('Parse GROUP BY query with JOIN and WHERE clauses', () => { - const query = 'SELECT student.name, COUNT(*) FROM student INNER JOIN enrollment ON student.id = enrollment.student_id WHERE enrollment.course = "Mathematics" GROUP BY student.name'; - const parsed = parseSelectQuery(query); - expect(parsed).toEqual({ - fields: ['student.name', 'COUNT(*)'], - table: 'student', - whereClauses: [{ field: 'enrollment.course', operator: '=', value: '"Mathematics"' }], - groupByFields: ['student.name'], - joinType: 'INNER', - joinTable: 'enrollment', - joinCondition: { - left: 'student.id', - right: 'enrollment.student_id' - }, - hasAggregateWithoutGroupBy: false, - orderByFields: null, - "limit": null, - isDistinct: false, - }); -}); - -test('Execute SQL Query with ORDER BY', async () => { - const query = 'SELECT name FROM student ORDER BY name ASC'; - const result = await executeSELECTQuery(query); - - expect(result).toStrictEqual([ - { name: 'Alice' }, - { name: 'Bob' }, - { name: 'Jane' }, - { name: 'John' } - ]); -}); - -test('Execute SQL Query with ORDER BY and WHERE', async () => { - const query = 'SELECT name FROM student WHERE age > 24 ORDER BY name DESC'; - const result = await executeSELECTQuery(query); - - expect(result).toStrictEqual([ - { name: 'John' }, - { name: 'Jane' }, - ]); -}); -test('Execute SQL Query with ORDER BY and GROUP BY', async () => { - const query = 'SELECT COUNT(id) as count, age FROM student GROUP BY age ORDER BY age DESC'; - const result = await executeSELECTQuery(query); - - expect(result).toStrictEqual([ - { age: '30', 'COUNT(id) as count': 1 }, - { age: '25', 'COUNT(id) as count': 1 }, - { age: '24', 'COUNT(id) as count': 1 }, - { age: '22', 'COUNT(id) as count': 1 } - ]); -}); - -test('Execute SQL Query with standard LIMIT clause', async () => { - const query = 'SELECT id, name FROM student LIMIT 2'; - const result = await executeSELECTQuery(query); - expect(result.length).toEqual(2); -}); - -test('Execute SQL Query with LIMIT clause equal to total rows', async () => { - const query = 'SELECT id, name FROM student LIMIT 4'; - const result = await executeSELECTQuery(query); - expect(result.length).toEqual(4); -}); - -test('Execute SQL Query with LIMIT clause exceeding total rows', async () => { - const query = 'SELECT id, name FROM student LIMIT 10'; - const result = await executeSELECTQuery(query); - expect(result.length).toEqual(4); // Total rows in student.csv -}); - -test('Execute SQL Query with LIMIT 0', async () => { - const query = 'SELECT id, name FROM student LIMIT 0'; - const result = await executeSELECTQuery(query); - expect(result.length).toEqual(0); -}); - -test('Execute SQL Query with LIMIT and ORDER BY clause', async () => { - const query = 'SELECT id, name FROM student ORDER BY age DESC LIMIT 2'; - const result = await executeSELECTQuery(query); - expect(result.length).toEqual(2); - expect(result[0].name).toEqual('John'); - expect(result[1].name).toEqual('Jane'); -}); - -test('Error Handling with Malformed Query', async () => { - const query = 'SELECT FROM table'; // intentionally malformed - await expect(executeSELECTQuery(query)).rejects.toThrow("Error executing query: Query parsing error: Invalid SELECT format"); -}); - -test('Basic DISTINCT Usage', async () => { - const query = 'SELECT DISTINCT age FROM student'; - const result = await executeSELECTQuery(query); - expect(result).toEqual([{ age: '30' }, { age: '25' }, { age: '22' }, { age: '24' }]); + field: "age", + operator: "=", + value: "30", + }, + { + field: "name", + operator: "=", + value: "John", + }, + ], + joinCondition: null, + joinTable: null, + joinType: null, + groupByFields: null, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse SQL Query with INNER JOIN", async () => { + const query = + "SELECT student.name, enrollment.course FROM student INNER JOIN enrollment ON student.id=enrollment.student_id"; + const result = await parseSelectQuery(query); + expect(result).toEqual({ + fields: ["student.name", "enrollment.course"], + table: "student", + whereClauses: [], + joinTable: "enrollment", + joinType: "INNER", + joinCondition: { left: "student.id", right: "enrollment.student_id" }, + groupByFields: null, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse SQL Query with INNER JOIN and WHERE Clause", async () => { + const query = + "SELECT student.name, enrollment.course FROM student INNER JOIN enrollment ON student.id = enrollment.student_id WHERE student.age > 20"; + const result = await parseSelectQuery(query); + expect(result).toEqual({ + fields: ["student.name", "enrollment.course"], + table: "student", + whereClauses: [{ field: "student.age", operator: ">", value: "20" }], + joinTable: "enrollment", + joinType: "INNER", + joinCondition: { left: "student.id", right: "enrollment.student_id" }, + groupByFields: null, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse INNER JOIN clause", () => { + const query = + "SELECT * FROM table1 INNER JOIN table2 ON table1.id = table2.ref_id"; + const result = parseJoinClause(query); + expect(result).toEqual({ + joinType: "INNER", + joinTable: "table2", + joinCondition: { left: "table1.id", right: "table2.ref_id" }, + }); +}); + +test("Parse LEFT JOIN clause", () => { + const query = + "SELECT * FROM table1 LEFT JOIN table2 ON table1.id = table2.ref_id"; + const result = parseJoinClause(query); + expect(result).toEqual({ + joinType: "LEFT", + joinTable: "table2", + joinCondition: { left: "table1.id", right: "table2.ref_id" }, + }); +}); + +test("Parse RIGHT JOIN clause", () => { + const query = + "SELECT * FROM table1 RIGHT JOIN table2 ON table1.id = table2.ref_id"; + const result = parseJoinClause(query); + expect(result).toEqual({ + joinType: "RIGHT", + joinTable: "table2", + joinCondition: { left: "table1.id", right: "table2.ref_id" }, + }); +}); + +test("Returns null for queries without JOIN", () => { + const query = "SELECT * FROM table1"; + const result = parseJoinClause(query); + expect(result).toEqual({ + joinType: null, + joinTable: null, + joinCondition: null, + }); +}); + +test("Parse LEFT Join Query Completely", () => { + const query = + "SELECT student.name, enrollment.course FROM student LEFT JOIN enrollment ON student.id=enrollment.student_id"; + const result = parseSelectQuery(query); + expect(result).toEqual({ + fields: ["student.name", "enrollment.course"], + table: "student", + whereClauses: [], + joinType: "LEFT", + joinTable: "enrollment", + joinCondition: { left: "student.id", right: "enrollment.student_id" }, + groupByFields: null, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse LEFT Join Query Completely", () => { + const query = + "SELECT student.name, enrollment.course FROM student RIGHT JOIN enrollment ON student.id=enrollment.student_id"; + const result = parseSelectQuery(query); + expect(result).toEqual({ + fields: ["student.name", "enrollment.course"], + table: "student", + whereClauses: [], + joinType: "RIGHT", + joinTable: "enrollment", + joinCondition: { left: "student.id", right: "enrollment.student_id" }, + groupByFields: null, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse SQL Query with LEFT JOIN with a WHERE clause filtering the main table", async () => { + const query = + "SELECT student.name, enrollment.course FROM student LEFT JOIN enrollment ON student.id=enrollment.student_id WHERE student.age > 22"; + const result = await parseSelectQuery(query); + expect(result).toEqual({ + fields: ["student.name", "enrollment.course"], + joinCondition: { left: "student.id", right: "enrollment.student_id" }, + joinTable: "enrollment", + joinType: "LEFT", + table: "student", + whereClauses: [{ field: "student.age", operator: ">", value: "22" }], + groupByFields: null, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse SQL Query with LEFT JOIN with a WHERE clause filtering the join table", async () => { + const query = `SELECT student.name, enrollment.course FROM student LEFT JOIN enrollment ON student.id=enrollment.student_id WHERE enrollment.course = 'Physics'`; + const result = await parseSelectQuery(query); + expect(result).toEqual({ + fields: ["student.name", "enrollment.course"], + joinCondition: { left: "student.id", right: "enrollment.student_id" }, + joinTable: "enrollment", + joinType: "LEFT", + table: "student", + whereClauses: [ + { field: "enrollment.course", operator: "=", value: "'Physics'" }, + ], + groupByFields: null, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse SQL Query with RIGHT JOIN with a WHERE clause filtering the main table", async () => { + const query = + "SELECT student.name, enrollment.course FROM student RIGHT JOIN enrollment ON student.id=enrollment.student_id WHERE student.age < 25"; + const result = await parseSelectQuery(query); + expect(result).toEqual({ + fields: ["student.name", "enrollment.course"], + joinCondition: { left: "student.id", right: "enrollment.student_id" }, + joinTable: "enrollment", + joinType: "RIGHT", + table: "student", + whereClauses: [{ field: "student.age", operator: "<", value: "25" }], + groupByFields: null, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse SQL Query with RIGHT JOIN with a WHERE clause filtering the join table", async () => { + const query = `SELECT student.name, enrollment.course FROM student RIGHT JOIN enrollment ON student.id=enrollment.student_id WHERE enrollment.course = 'Chemistry'`; + const result = await parseSelectQuery(query); + expect(result).toEqual({ + fields: ["student.name", "enrollment.course"], + joinCondition: { left: "student.id", right: "enrollment.student_id" }, + joinTable: "enrollment", + joinType: "RIGHT", + table: "student", + whereClauses: [ + { field: "enrollment.course", operator: "=", value: "'Chemistry'" }, + ], + groupByFields: null, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse COUNT Aggregate Query", () => { + const query = "SELECT COUNT(*) FROM student"; + const parsed = parseSelectQuery(query); + expect(parsed).toEqual({ + fields: ["COUNT(*)"], + table: "student", + whereClauses: [], + groupByFields: null, + hasAggregateWithoutGroupBy: true, + joinCondition: null, + joinTable: null, + joinType: null, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse SUM Aggregate Query", () => { + const query = "SELECT SUM(age) FROM student"; + const parsed = parseSelectQuery(query); + expect(parsed).toEqual({ + fields: ["SUM(age)"], + table: "student", + whereClauses: [], + groupByFields: null, + hasAggregateWithoutGroupBy: true, + joinCondition: null, + joinTable: null, + joinType: null, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse AVG Aggregate Query", () => { + const query = "SELECT AVG(age) FROM student"; + const parsed = parseSelectQuery(query); + expect(parsed).toEqual({ + fields: ["AVG(age)"], + table: "student", + whereClauses: [], + groupByFields: null, + hasAggregateWithoutGroupBy: true, + joinCondition: null, + joinTable: null, + joinType: null, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse MIN Aggregate Query", () => { + const query = "SELECT MIN(age) FROM student"; + const parsed = parseSelectQuery(query); + expect(parsed).toEqual({ + fields: ["MIN(age)"], + table: "student", + whereClauses: [], + groupByFields: null, + hasAggregateWithoutGroupBy: true, + joinCondition: null, + joinTable: null, + joinType: null, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse MAX Aggregate Query", () => { + const query = "SELECT MAX(age) FROM student"; + const parsed = parseSelectQuery(query); + expect(parsed).toEqual({ + fields: ["MAX(age)"], + table: "student", + whereClauses: [], + groupByFields: null, + hasAggregateWithoutGroupBy: true, + joinCondition: null, + joinTable: null, + joinType: null, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse basic GROUP BY query", () => { + const query = "SELECT age, COUNT(*) FROM student GROUP BY age"; + const parsed = parseSelectQuery(query); + expect(parsed).toEqual({ + fields: ["age", "COUNT(*)"], + table: "student", + whereClauses: [], + groupByFields: ["age"], + joinType: null, + joinTable: null, + joinCondition: null, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse GROUP BY query with WHERE clause", () => { + const query = "SELECT age, COUNT(*) FROM student WHERE age > 22 GROUP BY age"; + const parsed = parseSelectQuery(query); + expect(parsed).toEqual({ + fields: ["age", "COUNT(*)"], + table: "student", + whereClauses: [{ field: "age", operator: ">", value: "22" }], + groupByFields: ["age"], + joinType: null, + joinTable: null, + joinCondition: null, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse GROUP BY query with multiple fields", () => { + const query = + "SELECT student_id, course, COUNT(*) FROM enrollment GROUP BY student_id, course"; + const parsed = parseSelectQuery(query); + expect(parsed).toEqual({ + fields: ["student_id", "course", "COUNT(*)"], + table: "enrollment", + whereClauses: [], + groupByFields: ["student_id", "course"], + joinType: null, + joinTable: null, + joinCondition: null, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse GROUP BY query with JOIN and WHERE clauses", () => { + const query = + 'SELECT student.name, COUNT(*) FROM student INNER JOIN enrollment ON student.id = enrollment.student_id WHERE enrollment.course = "Mathematics" GROUP BY student.name'; + const parsed = parseSelectQuery(query); + expect(parsed).toEqual({ + fields: ["student.name", "COUNT(*)"], + table: "student", + whereClauses: [ + { field: "enrollment.course", operator: "=", value: '"Mathematics"' }, + ], + groupByFields: ["student.name"], + joinType: "INNER", + joinTable: "enrollment", + joinCondition: { + left: "student.id", + right: "enrollment.student_id", + }, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Execute SQL Query with ORDER BY", async () => { + const query = "SELECT name FROM student ORDER BY name ASC"; + const result = await executeSELECTQuery(query); + + expect(result).toStrictEqual([ + { name: "Alice" }, + { name: "Bob" }, + { name: "Jane" }, + { name: "John" }, + ]); +}); + +test("Execute SQL Query with ORDER BY and WHERE", async () => { + const query = "SELECT name FROM student WHERE age > 24 ORDER BY name DESC"; + const result = await executeSELECTQuery(query); + + expect(result).toStrictEqual([{ name: "John" }, { name: "Jane" }]); +}); +test("Execute SQL Query with ORDER BY and GROUP BY", async () => { + const query = + "SELECT COUNT(id) as count, age FROM student GROUP BY age ORDER BY age DESC"; + const result = await executeSELECTQuery(query); + + expect(result).toStrictEqual([ + { age: "30", "COUNT(id) as count": 1 }, + { age: "25", "COUNT(id) as count": 1 }, + { age: "24", "COUNT(id) as count": 1 }, + { age: "22", "COUNT(id) as count": 1 }, + ]); +}); + +test("Execute SQL Query with standard LIMIT clause", async () => { + const query = "SELECT id, name FROM student LIMIT 2"; + const result = await executeSELECTQuery(query); + expect(result.length).toEqual(2); +}); + +test("Execute SQL Query with LIMIT clause equal to total rows", async () => { + const query = "SELECT id, name FROM student LIMIT 4"; + const result = await executeSELECTQuery(query); + expect(result.length).toEqual(4); +}); + +test("Execute SQL Query with LIMIT clause exceeding total rows", async () => { + const query = "SELECT id, name FROM student LIMIT 10"; + const result = await executeSELECTQuery(query); + expect(result.length).toEqual(4); +}); + +test("Execute SQL Query with LIMIT 0", async () => { + const query = "SELECT id, name FROM student LIMIT 0"; + const result = await executeSELECTQuery(query); + expect(result.length).toEqual(0); +}); + +test("Execute SQL Query with LIMIT and ORDER BY clause", async () => { + const query = "SELECT id, name FROM student ORDER BY age DESC LIMIT 2"; + const result = await executeSELECTQuery(query); + expect(result.length).toEqual(2); + expect(result[0].name).toEqual("John"); + expect(result[1].name).toEqual("Jane"); +}); + +test("Error Handling with Malformed Query", async () => { + const query = "SELECT FROM table"; + await expect(executeSELECTQuery(query)).rejects.toThrow( + "Error executing query: Query parsing error: Invalid SELECT format" + ); +}); + +test("Basic DISTINCT Usage", async () => { + const query = "SELECT DISTINCT age FROM student"; + const result = await executeSELECTQuery(query); + expect(result).toEqual([ + { age: "30" }, + { age: "25" }, + { age: "22" }, + { age: "24" }, + ]); +}); + +test("DISTINCT with Multiple Columns", async () => { + const query = "SELECT DISTINCT student_id, course FROM enrollment"; + const result = await executeSELECTQuery(query); + expect(result).toEqual([ + { student_id: "1", course: "Mathematics" }, + { student_id: "1", course: "Physics" }, + { student_id: "2", course: "Chemistry" }, + { student_id: "3", course: "Mathematics" }, + { student_id: "5", course: "Biology" }, + ]); }); - -test('DISTINCT with Multiple Columns', async () => { - const query = 'SELECT DISTINCT student_id, course FROM enrollment'; - const result = await executeSELECTQuery(query); - // Expecting unique combinations of student_id and course - expect(result).toEqual([ - { student_id: '1', course: 'Mathematics' }, - { student_id: '1', course: 'Physics' }, - { student_id: '2', course: 'Chemistry' }, - { student_id: '3', course: 'Mathematics' }, - { student_id: '5', course: 'Biology' }, - ]); +test("DISTINCT with WHERE Clause", async () => { + const query = 'SELECT DISTINCT course FROM enrollment WHERE student_id = "1"'; + const result = await executeSELECTQuery(query); + expect(result).toEqual([{ course: "Mathematics" }, { course: "Physics" }]); }); -// Not a good test right now -test('DISTINCT with WHERE Clause', async () => { - const query = 'SELECT DISTINCT course FROM enrollment WHERE student_id = "1"'; - const result = await executeSELECTQuery(query); - // Expecting courses taken by student with ID 1 - expect(result).toEqual([{ course: 'Mathematics' }, { course: 'Physics' }]); +test("DISTINCT with JOIN Operations", async () => { + const query = + "SELECT DISTINCT student.name FROM student INNER JOIN enrollment ON student.id = enrollment.student_id"; + const result = await executeSELECTQuery(query); + expect(result).toEqual([ + { "student.name": "John" }, + { "student.name": "Jane" }, + { "student.name": "Bob" }, + ]); }); -test('DISTINCT with JOIN Operations', async () => { - const query = 'SELECT DISTINCT student.name FROM student INNER JOIN enrollment ON student.id = enrollment.student_id'; - const result = await executeSELECTQuery(query); - // Expecting names of students who are enrolled in any course - expect(result).toEqual([{ "student.name": 'John' }, { "student.name": 'Jane' }, { "student.name": 'Bob' }]); +test("DISTINCT with ORDER BY and LIMIT", async () => { + const query = "SELECT DISTINCT age FROM student ORDER BY age DESC LIMIT 2"; + const result = await executeSELECTQuery(query); + expect(result).toEqual([{ age: "30" }, { age: "25" }]); }); -test('DISTINCT with ORDER BY and LIMIT', async () => { - const query = 'SELECT DISTINCT age FROM student ORDER BY age DESC LIMIT 2'; - const result = await executeSELECTQuery(query); - // Expecting the two highest unique ages - expect(result).toEqual([{ age: '30' }, { age: '25' }]); +test("Execute SQL Query with LIKE Operator for Name", async () => { + const query = "SELECT name FROM student WHERE name LIKE '%Jane%'"; + const result = await executeSELECTQuery(query); + expect(result).toEqual([{ name: "Jane" }]); }); -test('Execute SQL Query with LIKE Operator for Name', async () => { - const query = "SELECT name FROM student WHERE name LIKE '%Jane%'"; - const result = await executeSELECTQuery(query); - // Expecting names containing 'Jane' - expect(result).toEqual([{ name: 'Jane' }]); +test("Execute SQL Query with LIKE Operator and Wildcards", async () => { + const query = "SELECT name FROM student WHERE name LIKE 'J%'"; + const result = await executeSELECTQuery(query); + expect(result).toEqual([{ name: "John" }, { name: "Jane" }]); }); -test('Execute SQL Query with LIKE Operator and Wildcards', async () => { - const query = "SELECT name FROM student WHERE name LIKE 'J%'"; - const result = await executeSELECTQuery(query); - // Expecting names starting with 'J' - expect(result).toEqual([{ name: 'John' }, { name: 'Jane' }]); +test("Execute SQL Query with LIKE Operator Case Insensitive", async () => { + const query = "SELECT name FROM student WHERE name LIKE '%bob%'"; + const result = await executeSELECTQuery(query); + expect(result).toEqual([{ name: "Bob" }]); }); -test('Execute SQL Query with LIKE Operator Case Insensitive', async () => { - const query = "SELECT name FROM student WHERE name LIKE '%bob%'"; - const result = await executeSELECTQuery(query); - // Expecting names 'Bob' (case insensitive) - expect(result).toEqual([{ name: 'Bob' }]); +test("Execute SQL Query with LIKE Operator and DISTINCT", async () => { + const query = "SELECT DISTINCT name FROM student WHERE name LIKE '%e%'"; + const result = await executeSELECTQuery(query); + expect(result).toEqual([{ name: "Jane" }, { name: "Alice" }]); }); -test('Execute SQL Query with LIKE Operator and DISTINCT', async () => { - const query = "SELECT DISTINCT name FROM student WHERE name LIKE '%e%'"; - const result = await executeSELECTQuery(query); - // Expecting unique names containing 'e' - expect(result).toEqual([{ name: 'Jane' }, { name: 'Alice' }]); +test("LIKE with ORDER BY and LIMIT", async () => { + const query = + "SELECT name FROM student WHERE name LIKE '%a%' ORDER BY name ASC LIMIT 2"; + const result = await executeSELECTQuery(query); + expect(result).toEqual([{ name: "Alice" }, { name: "Jane" }]); }); - -test('LIKE with ORDER BY and LIMIT', async () => { - const query = "SELECT name FROM student WHERE name LIKE '%a%' ORDER BY name ASC LIMIT 2"; - const result = await executeSELECTQuery(query); - // Expecting the first two names alphabetically that contain 'a' - expect(result).toEqual([{ name: 'Alice' }, { name: 'Jane' }]); -}); \ No newline at end of file diff --git a/tests/step-17/insertExecuter.test.js b/tests/step-17/insertExecuter.test.js index 8c405f727..486d59178 100644 --- a/tests/step-17/insertExecuter.test.js +++ b/tests/step-17/insertExecuter.test.js @@ -1,33 +1,38 @@ -const { executeINSERTQuery } = require('../../src/index'); -const { readCSV, writeCSV } = require('../../src/csvReader'); -const fs = require('fs'); +const { executeINSERTQuery } = require("../../src/queryExecutor"); +const { readCSV, writeCSV } = require("../../src/csvReader"); +const fs = require("fs"); // Helper function to create grades.csv with initial data async function createGradesCSV() { - const initialData = [ - { student_id: '1', course: 'Mathematics', grade: 'A' }, - { student_id: '2', course: 'Chemistry', grade: 'B' }, - { student_id: '3', course: 'Mathematics', grade: 'C' } - ]; - await writeCSV('grades.csv', initialData); + const initialData = [ + { student_id: "1", course: "Mathematics", grade: "A" }, + { student_id: "2", course: "Chemistry", grade: "B" }, + { student_id: "3", course: "Mathematics", grade: "C" }, + ]; + await writeCSV("grades.csv", initialData); + const updatedData = await readCSV("grades.csv"); + console.log(updatedData); } // Test to INSERT a new grade and verify -test('Execute INSERT INTO Query for grades.csv', async () => { - // Create grades.csv with initial data - await createGradesCSV(); +test("Execute INSERT INTO Query for grades.csv", async () => { + // Create grades.csv with initial data + await createGradesCSV(); - // Execute INSERT statement - const insertQuery = "INSERT INTO grades (student_id, course, grade) VALUES ('4', 'Physics', 'A')"; - await executeINSERTQuery(insertQuery); + // Execute INSERT statement + const insertQuery = + "INSERT INTO grades (student_id, course, grade) VALUES ('4', 'Physics', 'A')"; + await executeINSERTQuery(insertQuery); - // Verify the new entry - const updatedData = await readCSV('grades.csv'); - const newEntry = updatedData.find(row => row.student_id === '4' && row.course === 'Physics'); - console.log(updatedData) - expect(newEntry).toBeDefined(); - expect(newEntry.grade).toEqual('A'); + // Verify the new entry + const updatedData = await readCSV("grades.csv"); + const newEntry = updatedData.find( + (row) => row.student_id === "4" && row.course === "Physics" + ); + console.log(updatedData); + expect(newEntry).toBeDefined(); + expect(newEntry.grade).toEqual("A"); - // Cleanup: Delete grades.csv - fs.unlinkSync('grades.csv'); -}); \ No newline at end of file + // Cleanup: Delete grades.csv + fs.unlinkSync("grades.csv"); +}); diff --git a/tests/step-18/deleteExecutor.test.js b/tests/step-18/deleteExecutor.test.js index 11ae617b7..0e53a921e 100644 --- a/tests/step-18/deleteExecutor.test.js +++ b/tests/step-18/deleteExecutor.test.js @@ -1,31 +1,31 @@ -const { executeDELETEQuery } = require('../../src/index'); -const { readCSV, writeCSV } = require('../../src/csvReader'); -const fs = require('fs'); +const { executeDELETEQuery } = require("../../src/queryExecutor"); +const { readCSV, writeCSV } = require("../../src/csvReader"); +const fs = require("fs"); // Helper function to create courses.csv with initial data async function createCoursesCSV() { - const initialData = [ - { course_id: '1', course_name: 'Mathematics', instructor: 'Dr. Smith' }, - { course_id: '2', course_name: 'Chemistry', instructor: 'Dr. Jones' }, - { course_id: '3', course_name: 'Physics', instructor: 'Dr. Taylor' } - ]; - await writeCSV('courses.csv', initialData); + const initialData = [ + { course_id: "1", course_name: "Mathematics", instructor: "Dr. Smith" }, + { course_id: "2", course_name: "Chemistry", instructor: "Dr. Jones" }, + { course_id: "3", course_name: "Physics", instructor: "Dr. Taylor" }, + ]; + await writeCSV("courses.csv", initialData); } // Test to DELETE a course and verify -test('Execute DELETE FROM Query for courses.csv', async () => { - // Create courses.csv with initial data - await createCoursesCSV(); +test("Execute DELETE FROM Query for courses.csv", async () => { + // Create courses.csv with initial data + await createCoursesCSV(); - // Execute DELETE statement - const deleteQuery = "DELETE FROM courses WHERE course_id = '2'"; - await executeDELETEQuery(deleteQuery); + // Execute DELETE statement + const deleteQuery = "DELETE FROM courses WHERE course_id = '2'"; + await executeDELETEQuery(deleteQuery); - // Verify the course was removed - const updatedData = await readCSV('courses.csv'); - const deletedCourse = updatedData.find(course => course.course_id === '2'); - expect(deletedCourse).toBeUndefined(); + // Verify the course was removed + const updatedData = await readCSV("courses.csv"); + const deletedCourse = updatedData.find((course) => course.course_id === "2"); + expect(deletedCourse).toBeUndefined(); - // Cleanup: Delete courses.csv - fs.unlinkSync('courses.csv'); -}); \ No newline at end of file + // Cleanup: Delete courses.csv + fs.unlinkSync("courses.csv"); +}); diff --git a/tests/step-18/index.test.js b/tests/step-18/index.test.js index c99d01fbb..bd272e907 100644 --- a/tests/step-18/index.test.js +++ b/tests/step-18/index.test.js @@ -1,59 +1,60 @@ -const {readCSV} = require('../../src/csvReader'); -const {executeSELECTQuery } = require('../../src/index'); -const { parseJoinClause, parseSelectQuery } = require('../../src/queryParser'); - -test('Read CSV File', async () => { - const data = await readCSV('./student.csv'); - expect(data.length).toBeGreaterThan(0); - expect(data.length).toBe(4); - expect(data[0].name).toBe('John'); - expect(data[0].age).toBe('30'); //ignore the string type here, we will fix this later -}); - -test('Execute SQL Query', async () => { - const query = 'SELECT id, name FROM student'; - const result = await executeSELECTQuery(query); - expect(result.length).toBeGreaterThan(0); - expect(result[0]).toHaveProperty('id'); - expect(result[0]).toHaveProperty('name'); - expect(result[0]).not.toHaveProperty('age'); - expect(result[0]).toEqual({ id: '1', name: 'John' }); -}); - -test('Execute SQL Query with WHERE Clause', async () => { - const query = 'SELECT id, name FROM student WHERE age = 25'; - const result = await executeSELECTQuery(query); - expect(result.length).toBe(1); - expect(result[0]).toHaveProperty('id'); - expect(result[0]).toHaveProperty('name'); - expect(result[0].id).toBe('2'); -}); - -test('Execute SQL Query with Complex WHERE Clause', async () => { - const query = 'SELECT id, name FROM student WHERE age = 30 AND name = John'; - const result = await executeSELECTQuery(query); - expect(result.length).toBe(1); - expect(result[0]).toEqual({ id: '1', name: 'John' }); -}); - -test('Execute SQL Query with Greater Than', async () => { - const queryWithGT = 'SELECT id FROM student WHERE age > 22'; - const result = await executeSELECTQuery(queryWithGT); - expect(result.length).toEqual(3); - expect(result[0]).toHaveProperty('id'); -}); - -test('Execute SQL Query with Not Equal to', async () => { - const queryWithGT = 'SELECT name FROM student WHERE age != 25'; - const result = await executeSELECTQuery(queryWithGT); - expect(result.length).toEqual(3); - expect(result[0]).toHaveProperty('name'); -}); - -test('Execute SQL Query with INNER JOIN', async () => { - const query = 'SELECT student.name, enrollment.course FROM student INNER JOIN enrollment ON student.id=enrollment.student_id'; - const result = await executeSELECTQuery(query); - /* +const { readCSV } = require("../../src/csvReader"); +const { executeSELECTQuery } = require("../../src/queryExecutor"); +const { parseJoinClause, parseSelectQuery } = require("../../src/queryParser"); + +test("Read CSV File", async () => { + const data = await readCSV("./student.csv"); + expect(data.length).toBeGreaterThan(0); + expect(data.length).toBe(4); + expect(data[0].name).toBe("John"); + expect(data[0].age).toBe("30"); //ignore the string type here, we will fix this later +}); + +test("Execute SQL Query", async () => { + const query = "SELECT id, name FROM student"; + const result = await executeSELECTQuery(query); + expect(result.length).toBeGreaterThan(0); + expect(result[0]).toHaveProperty("id"); + expect(result[0]).toHaveProperty("name"); + expect(result[0]).not.toHaveProperty("age"); + expect(result[0]).toEqual({ id: "1", name: "John" }); +}); + +test("Execute SQL Query with WHERE Clause", async () => { + const query = "SELECT id, name FROM student WHERE age = 25"; + const result = await executeSELECTQuery(query); + expect(result.length).toBe(1); + expect(result[0]).toHaveProperty("id"); + expect(result[0]).toHaveProperty("name"); + expect(result[0].id).toBe("2"); +}); + +test("Execute SQL Query with Complex WHERE Clause", async () => { + const query = "SELECT id, name FROM student WHERE age = 30 AND name = John"; + const result = await executeSELECTQuery(query); + expect(result.length).toBe(1); + expect(result[0]).toEqual({ id: "1", name: "John" }); +}); + +test("Execute SQL Query with Greater Than", async () => { + const queryWithGT = "SELECT id FROM student WHERE age > 22"; + const result = await executeSELECTQuery(queryWithGT); + expect(result.length).toEqual(3); + expect(result[0]).toHaveProperty("id"); +}); + +test("Execute SQL Query with Not Equal to", async () => { + const queryWithGT = "SELECT name FROM student WHERE age != 25"; + const result = await executeSELECTQuery(queryWithGT); + expect(result.length).toEqual(3); + expect(result[0]).toHaveProperty("name"); +}); + +test("Execute SQL Query with INNER JOIN", async () => { + const query = + "SELECT student.name, enrollment.course FROM student INNER JOIN enrollment ON student.id=enrollment.student_id"; + const result = await executeSELECTQuery(query); + /* result = [ { 'student.name': 'John', 'enrollment.course': 'Mathematics' }, { 'student.name': 'John', 'enrollment.course': 'Physics' }, @@ -61,762 +62,834 @@ test('Execute SQL Query with INNER JOIN', async () => { { 'student.name': 'Bob', 'enrollment.course': 'Mathematics' } ] */ - expect(result.length).toEqual(4); - // toHaveProperty is not working here due to dot in the property name - expect(result[0]).toEqual(expect.objectContaining({ - "enrollment.course": "Mathematics", - "student.name": "John" - })); + expect(result.length).toEqual(4); + // toHaveProperty is not working here due to dot in the property name + expect(result[0]).toEqual( + expect.objectContaining({ + "enrollment.course": "Mathematics", + "student.name": "John", + }) + ); }); -test('Execute SQL Query with INNER JOIN and a WHERE Clause', async () => { - const query = 'SELECT student.name, enrollment.course, student.age FROM student INNER JOIN enrollment ON student.id = enrollment.student_id WHERE student.age > 25'; - const result = await executeSELECTQuery(query); - /* +test("Execute SQL Query with INNER JOIN and a WHERE Clause", async () => { + const query = + "SELECT student.name, enrollment.course, student.age FROM student INNER JOIN enrollment ON student.id = enrollment.student_id WHERE student.age > 25"; + const result = await executeSELECTQuery(query); + /* result = [ { 'student.name': 'John', - 'enrollment.course': 'Mathematics', - 'student.age': '30' - }, - { - 'student.name': 'John', - 'enrollment.course': 'Physics', - 'student.age': '30' + @@ -86,737 +90,812 @@ test('Execute SQL Query with INNER JOIN and a WHERE Clause', async () => { } ] */ - expect(result.length).toEqual(2); - // toHaveProperty is not working here due to dot in the property name - expect(result[0]).toEqual(expect.objectContaining({ - "enrollment.course": "Mathematics", - "student.name": "John" - })); -}); - -test('Execute SQL Query with LEFT JOIN', async () => { - const query = 'SELECT student.name, enrollment.course FROM student LEFT JOIN enrollment ON student.id=enrollment.student_id'; - const result = await executeSELECTQuery(query); - expect(result).toEqual(expect.arrayContaining([ - expect.objectContaining({ "student.name": "Alice", "enrollment.course": null }), - expect.objectContaining({ "student.name": "John", "enrollment.course": "Mathematics" }) - ])); - expect(result.length).toEqual(5); // 4 students, but John appears twice -}); - -test('Execute SQL Query with RIGHT JOIN', async () => { - const query = 'SELECT student.name, enrollment.course FROM student RIGHT JOIN enrollment ON student.id=enrollment.student_id'; - const result = await executeSELECTQuery(query); - expect(result).toEqual(expect.arrayContaining([ - expect.objectContaining({ "student.name": null, "enrollment.course": "Biology" }), - expect.objectContaining({ "student.name": "John", "enrollment.course": "Mathematics" }) - ])); - expect(result.length).toEqual(5); // 4 courses, but Mathematics appears twice -}); - -test('Execute SQL Query with LEFT JOIN with a WHERE clause filtering the main table', async () => { - const query = 'SELECT student.name, enrollment.course FROM student LEFT JOIN enrollment ON student.id=enrollment.student_id WHERE student.age > 22'; - const result = await executeSELECTQuery(query); - expect(result).toEqual(expect.arrayContaining([ - expect.objectContaining({ "enrollment.course": "Mathematics", "student.name": "John" }), - expect.objectContaining({ "enrollment.course": "Physics", "student.name": "John" }) - ])); - expect(result.length).toEqual(4); -}); - -test('Execute SQL Query with LEFT JOIN with a WHERE clause filtering the join table', async () => { - const query = `SELECT student.name, enrollment.course FROM student LEFT JOIN enrollment ON student.id=enrollment.student_id WHERE enrollment.course = 'Physics'`; - const result = await executeSELECTQuery(query); - expect(result).toEqual(expect.arrayContaining([ - expect.objectContaining({ "student.name": "John", "enrollment.course": "Physics" }) - ])); - expect(result.length).toEqual(1); -}); - -test('Execute SQL Query with RIGHT JOIN with a WHERE clause filtering the main table', async () => { - const query = 'SELECT student.name, enrollment.course FROM student RIGHT JOIN enrollment ON student.id=enrollment.student_id WHERE student.age < 25'; - const result = await executeSELECTQuery(query); - expect(result).toEqual(expect.arrayContaining([ - expect.objectContaining({ "enrollment.course": "Mathematics", "student.name": "Bob" }), - expect.objectContaining({ "enrollment.course": "Biology", "student.name": null }) - ])); - expect(result.length).toEqual(2); -}); - -test('Execute SQL Query with RIGHT JOIN with a WHERE clause filtering the join table', async () => { - const query = `SELECT student.name, enrollment.course FROM student RIGHT JOIN enrollment ON student.id=enrollment.student_id WHERE enrollment.course = 'Chemistry'`; - const result = await executeSELECTQuery(query); - expect(result).toEqual(expect.arrayContaining([ - expect.objectContaining({ "enrollment.course": "Chemistry", "student.name": "Jane" }), - ])); - expect(result.length).toEqual(1); -}); - -test('Execute SQL Query with RIGHT JOIN with a multiple WHERE clauses filtering the join table and main table', async () => { - const query = `SELECT student.name, enrollment.course FROM student RIGHT JOIN enrollment ON student.id=enrollment.student_id WHERE enrollment.course = 'Chemistry' AND student.age = 26`; - const result = await executeSELECTQuery(query); - expect(result).toEqual([]); -}); - -test('Execute COUNT Aggregate Query', async () => { - const query = 'SELECT COUNT(*) FROM student'; - const result = await executeSELECTQuery(query); - expect(result).toEqual([{ 'COUNT(*)': 4 }]); -}); - -test('Execute SUM Aggregate Query', async () => { - const query = 'SELECT SUM(age) FROM student'; - const result = await executeSELECTQuery(query); - expect(result).toEqual([{ 'SUM(age)': 101 }]); -}); - -test('Execute AVG Aggregate Query', async () => { - const query = 'SELECT AVG(age) FROM student'; - const result = await executeSELECTQuery(query); - // Assuming AVG returns a single decimal point value - expect(result).toEqual([{ 'AVG(age)': 25.25 }]); -}); - -test('Execute MIN Aggregate Query', async () => { - const query = 'SELECT MIN(age) FROM student'; - const result = await executeSELECTQuery(query); - expect(result).toEqual([{ 'MIN(age)': 22 }]); -}); - -test('Execute MAX Aggregate Query', async () => { - const query = 'SELECT MAX(age) FROM student'; - const result = await executeSELECTQuery(query); - expect(result).toEqual([{ 'MAX(age)': 30 }]); -}); - -test('Count students per age', async () => { - const query = 'SELECT age, COUNT(*) FROM student GROUP BY age'; - const result = await executeSELECTQuery(query); - expect(result).toEqual([ - { age: '22', 'COUNT(*)': 1 }, - { age: '24', 'COUNT(*)': 1 }, - { age: '25', 'COUNT(*)': 1 }, - { age: '30', 'COUNT(*)': 1 } - ]); -}); - -test('Count enrollments per course', async () => { - const query = 'SELECT course, COUNT(*) FROM enrollment GROUP BY course'; - const result = await executeSELECTQuery(query); - expect(result).toEqual([ - { course: 'Mathematics', 'COUNT(*)': 2 }, - { course: 'Physics', 'COUNT(*)': 1 }, - { course: 'Chemistry', 'COUNT(*)': 1 }, - { course: 'Biology', 'COUNT(*)': 1 } - ]); -}); - - -test('Count courses per student', async () => { - const query = 'SELECT student_id, COUNT(*) FROM enrollment GROUP BY student_id'; - const result = await executeSELECTQuery(query); - expect(result).toEqual([ - { student_id: '1', 'COUNT(*)': 2 }, - { student_id: '2', 'COUNT(*)': 1 }, - { student_id: '3', 'COUNT(*)': 1 }, - { student_id: '5', 'COUNT(*)': 1 } - ]); -}); - -test('Count students within a specific age range', async () => { - const query = 'SELECT age, COUNT(*) FROM student WHERE age > 22 GROUP BY age'; - const result = await executeSELECTQuery(query); - expect(result).toEqual([ - { age: '24', 'COUNT(*)': 1 }, - { age: '25', 'COUNT(*)': 1 }, - { age: '30', 'COUNT(*)': 1 } - ]); -}); - -test('Count enrollments for a specific course', async () => { - const query = 'SELECT course, COUNT(*) FROM enrollment WHERE course = "Mathematics" GROUP BY course'; - const result = await executeSELECTQuery(query); - expect(result).toEqual([ - { course: 'Mathematics', 'COUNT(*)': 2 } - ]); -}); - -test('Count courses for a specific student', async () => { - const query = 'SELECT student_id, COUNT(*) FROM enrollment WHERE student_id = 1 GROUP BY student_id'; - const result = await executeSELECTQuery(query); - expect(result).toEqual([ - { student_id: '1', 'COUNT(*)': 2 } - ]); -}); - -test('Average age of students above a certain age', async () => { - const query = 'SELECT AVG(age) FROM student WHERE age > 22'; - const result = await executeSELECTQuery(query); - const expectedAverage = (25 + 30 + 24) / 3; // Average age of students older than 22 - expect(result).toEqual([{ 'AVG(age)': expectedAverage }]); -}); - -test('Parse SQL Query', () => { - const query = 'SELECT id, name FROM student'; - const parsed = parseSelectQuery(query); - expect(parsed).toEqual({ - fields: ['id', 'name'], - table: 'student', - whereClauses: [], - joinCondition: null, - joinTable: null, - joinType: null, - groupByFields: null, - hasAggregateWithoutGroupBy: false, - "orderByFields": null, - "limit": null, - isDistinct: false - }); -}); - -test('Parse SQL Query with WHERE Clause', () => { - const query = 'SELECT id, name FROM student WHERE age = 25'; - const parsed = parseSelectQuery(query); - expect(parsed).toEqual({ - fields: ['id', 'name'], - table: 'student', - whereClauses: [{ - "field": "age", - "operator": "=", - "value": "25", - }], - joinCondition: null, - joinTable: null, - joinType: null, - groupByFields: null, - hasAggregateWithoutGroupBy: false, - "orderByFields": null, - "limit": null, - isDistinct: false - }); -}); - -test('Parse SQL Query with Multiple WHERE Clauses', () => { - const query = 'SELECT id, name FROM student WHERE age = 30 AND name = John'; - const parsed = parseSelectQuery(query); - expect(parsed).toEqual({ - fields: ['id', 'name'], - table: 'student', - whereClauses: [{ - "field": "age", - "operator": "=", - "value": "30", - }, { - "field": "name", - "operator": "=", - "value": "John", - }], - joinCondition: null, - joinTable: null, - joinType: null, - groupByFields: null, - hasAggregateWithoutGroupBy: false, - "orderByFields": null, - "limit": null, - isDistinct: false - }); -}); - -test('Parse SQL Query with INNER JOIN', async () => { - const query = 'SELECT student.name, enrollment.course FROM student INNER JOIN enrollment ON student.id=enrollment.student_id'; - const result = await parseSelectQuery(query); - expect(result).toEqual({ - fields: ['student.name', 'enrollment.course'], - table: 'student', - whereClauses: [], - joinTable: 'enrollment', - joinType: "INNER", - joinCondition: { left: 'student.id', right: 'enrollment.student_id' }, - groupByFields: null, - hasAggregateWithoutGroupBy: false, - "orderByFields": null, - "limit": null, - isDistinct: false - }) -}); - -test('Parse SQL Query with INNER JOIN and WHERE Clause', async () => { - const query = 'SELECT student.name, enrollment.course FROM student INNER JOIN enrollment ON student.id = enrollment.student_id WHERE student.age > 20'; - const result = await parseSelectQuery(query); - expect(result).toEqual({ - fields: ['student.name', 'enrollment.course'], - table: 'student', - whereClauses: [{ field: 'student.age', operator: '>', value: '20' }], - joinTable: 'enrollment', - joinType: "INNER", - joinCondition: { left: 'student.id', right: 'enrollment.student_id' }, - groupByFields: null, - hasAggregateWithoutGroupBy: false, - "orderByFields": null, - "limit": null, - isDistinct: false - }) -}); - -test('Parse INNER JOIN clause', () => { - const query = 'SELECT * FROM table1 INNER JOIN table2 ON table1.id = table2.ref_id'; - const result = parseJoinClause(query); - expect(result).toEqual({ - joinType: 'INNER', - joinTable: 'table2', - joinCondition: { left: 'table1.id', right: 'table2.ref_id' }, - }); -}); - -test('Parse LEFT JOIN clause', () => { - const query = 'SELECT * FROM table1 LEFT JOIN table2 ON table1.id = table2.ref_id'; - const result = parseJoinClause(query); - expect(result).toEqual({ - joinType: 'LEFT', - joinTable: 'table2', - joinCondition: { left: 'table1.id', right: 'table2.ref_id' } - }); -}); - -test('Parse RIGHT JOIN clause', () => { - const query = 'SELECT * FROM table1 RIGHT JOIN table2 ON table1.id = table2.ref_id'; - const result = parseJoinClause(query); - expect(result).toEqual({ - joinType: 'RIGHT', - joinTable: 'table2', - joinCondition: { left: 'table1.id', right: 'table2.ref_id' } - }); -}); - -test('Returns null for queries without JOIN', () => { - const query = 'SELECT * FROM table1'; - const result = parseJoinClause(query); - expect(result).toEqual( - { - joinType: null, - joinTable: null, - joinCondition: null - } - ); -}); - -test('Parse LEFT Join Query Completely', () => { - const query = 'SELECT student.name, enrollment.course FROM student LEFT JOIN enrollment ON student.id=enrollment.student_id'; - const result = parseSelectQuery(query); - expect(result).toEqual({ - fields: ['student.name', 'enrollment.course'], - table: 'student', - whereClauses: [], - joinType: 'LEFT', - joinTable: 'enrollment', - joinCondition: { left: 'student.id', right: 'enrollment.student_id' }, - groupByFields: null, - hasAggregateWithoutGroupBy: false, - "orderByFields": null, - "limit": null, - isDistinct: false - }) -}) - -test('Parse LEFT Join Query Completely', () => { - const query = 'SELECT student.name, enrollment.course FROM student RIGHT JOIN enrollment ON student.id=enrollment.student_id'; - const result = parseSelectQuery(query); - expect(result).toEqual({ - fields: ['student.name', 'enrollment.course'], - table: 'student', - whereClauses: [], - joinType: 'RIGHT', - joinTable: 'enrollment', - joinCondition: { left: 'student.id', right: 'enrollment.student_id' }, - groupByFields: null, - hasAggregateWithoutGroupBy: false, - "orderByFields": null, - "limit": null, - isDistinct: false + expect(result.length).toEqual(2); + // toHaveProperty is not working here due to dot in the property name + expect(result[0]).toEqual( + expect.objectContaining({ + "enrollment.course": "Mathematics", + "student.name": "John", }) -}) - -test('Parse SQL Query with LEFT JOIN with a WHERE clause filtering the main table', async () => { - const query = 'SELECT student.name, enrollment.course FROM student LEFT JOIN enrollment ON student.id=enrollment.student_id WHERE student.age > 22'; - const result = await parseSelectQuery(query); - expect(result).toEqual({ - "fields": ["student.name", "enrollment.course"], - "joinCondition": { "left": "student.id", "right": "enrollment.student_id" }, - "joinTable": "enrollment", - "joinType": "LEFT", - "table": "student", - "whereClauses": [{ "field": "student.age", "operator": ">", "value": "22" }], - groupByFields: null, - hasAggregateWithoutGroupBy: false, - "orderByFields": null, - "limit": null, - isDistinct: false - }); -}); - -test('Parse SQL Query with LEFT JOIN with a WHERE clause filtering the join table', async () => { - const query = `SELECT student.name, enrollment.course FROM student LEFT JOIN enrollment ON student.id=enrollment.student_id WHERE enrollment.course = 'Physics'`; - const result = await parseSelectQuery(query); - expect(result).toEqual({ - "fields": ["student.name", "enrollment.course"], - "joinCondition": { "left": "student.id", "right": "enrollment.student_id" }, - "joinTable": "enrollment", - "joinType": "LEFT", - "table": "student", - "whereClauses": [{ "field": "enrollment.course", "operator": "=", "value": "'Physics'" }], - groupByFields: null, - hasAggregateWithoutGroupBy: false, - "orderByFields": null, - "limit": null, - isDistinct: false - }); -}); - -test('Parse SQL Query with RIGHT JOIN with a WHERE clause filtering the main table', async () => { - const query = 'SELECT student.name, enrollment.course FROM student RIGHT JOIN enrollment ON student.id=enrollment.student_id WHERE student.age < 25'; - const result = await parseSelectQuery(query); - expect(result).toEqual({ - "fields": ["student.name", "enrollment.course"], - "joinCondition": { "left": "student.id", "right": "enrollment.student_id" }, - "joinTable": "enrollment", - "joinType": "RIGHT", - "table": "student", - "whereClauses": [{ "field": "student.age", "operator": "<", "value": "25" }], - groupByFields: null, - hasAggregateWithoutGroupBy: false, - "orderByFields": null, - "limit": null, - isDistinct: false - }); -}); - -test('Parse SQL Query with RIGHT JOIN with a WHERE clause filtering the join table', async () => { - const query = `SELECT student.name, enrollment.course FROM student RIGHT JOIN enrollment ON student.id=enrollment.student_id WHERE enrollment.course = 'Chemistry'`; - const result = await parseSelectQuery(query); - expect(result).toEqual({ - "fields": ["student.name", "enrollment.course"], - "joinCondition": { "left": "student.id", "right": "enrollment.student_id" }, - "joinTable": "enrollment", - "joinType": "RIGHT", - "table": "student", - "whereClauses": [{ "field": "enrollment.course", "operator": "=", "value": "'Chemistry'" }], - groupByFields: null, - hasAggregateWithoutGroupBy: false, - "orderByFields": null, - "limit": null, - isDistinct: false - }); -}); - - -test('Parse COUNT Aggregate Query', () => { - const query = 'SELECT COUNT(*) FROM student'; - const parsed = parseSelectQuery(query); - expect(parsed).toEqual({ - fields: ['COUNT(*)'], - table: 'student', - whereClauses: [], - groupByFields: null, - hasAggregateWithoutGroupBy: true, - "joinCondition": null, - "joinTable": null, - "joinType": null, - "orderByFields": null, - "limit": null, - isDistinct: false - }); -}); - - -test('Parse SUM Aggregate Query', () => { - const query = 'SELECT SUM(age) FROM student'; - const parsed = parseSelectQuery(query); - expect(parsed).toEqual({ - fields: ['SUM(age)'], - table: 'student', - whereClauses: [], - groupByFields: null, - hasAggregateWithoutGroupBy: true, - "joinCondition": null, - "joinTable": null, - "joinType": null, - "orderByFields": null, - "limit": null, - isDistinct: false - }); -}); - -test('Parse AVG Aggregate Query', () => { - const query = 'SELECT AVG(age) FROM student'; - const parsed = parseSelectQuery(query); - expect(parsed).toEqual({ - fields: ['AVG(age)'], - table: 'student', - whereClauses: [], - groupByFields: null, - hasAggregateWithoutGroupBy: true, - "joinCondition": null, - "joinTable": null, - "joinType": null, - "orderByFields": null, - "limit": null, - isDistinct: false - }); -}); - -test('Parse MIN Aggregate Query', () => { - const query = 'SELECT MIN(age) FROM student'; - const parsed = parseSelectQuery(query); - expect(parsed).toEqual({ - fields: ['MIN(age)'], - table: 'student', - whereClauses: [], - groupByFields: null, - hasAggregateWithoutGroupBy: true, - "joinCondition": null, - "joinTable": null, - "joinType": null, - "orderByFields": null, - "limit": null, - isDistinct: false - }); -}); - -test('Parse MAX Aggregate Query', () => { - const query = 'SELECT MAX(age) FROM student'; - const parsed = parseSelectQuery(query); - expect(parsed).toEqual({ - fields: ['MAX(age)'], - table: 'student', - whereClauses: [], - groupByFields: null, - hasAggregateWithoutGroupBy: true, - "joinCondition": null, - "joinTable": null, - "joinType": null, - "orderByFields": null, - "limit": null, - isDistinct: false - }); -}); - -test('Parse basic GROUP BY query', () => { - const query = 'SELECT age, COUNT(*) FROM student GROUP BY age'; - const parsed = parseSelectQuery(query); - expect(parsed).toEqual({ - fields: ['age', 'COUNT(*)'], - table: 'student', - whereClauses: [], - groupByFields: ['age'], - joinType: null, - joinTable: null, - joinCondition: null, - hasAggregateWithoutGroupBy: false, - orderByFields: null, - "limit": null, - isDistinct: false - }); -}); - -test('Parse GROUP BY query with WHERE clause', () => { - const query = 'SELECT age, COUNT(*) FROM student WHERE age > 22 GROUP BY age'; - const parsed = parseSelectQuery(query); - expect(parsed).toEqual({ - fields: ['age', 'COUNT(*)'], - table: 'student', - whereClauses: [{ field: 'age', operator: '>', value: '22' }], - groupByFields: ['age'], - joinType: null, - joinTable: null, - joinCondition: null, - hasAggregateWithoutGroupBy: false, - orderByFields: null, - "limit": null, - isDistinct: false - }); -}); - -test('Parse GROUP BY query with multiple fields', () => { - const query = 'SELECT student_id, course, COUNT(*) FROM enrollment GROUP BY student_id, course'; - const parsed = parseSelectQuery(query); - expect(parsed).toEqual({ - fields: ['student_id', 'course', 'COUNT(*)'], - table: 'enrollment', - whereClauses: [], - groupByFields: ['student_id', 'course'], - joinType: null, - joinTable: null, - joinCondition: null, - hasAggregateWithoutGroupBy: false, - orderByFields: null, - "limit": null, - isDistinct: false - }); -}); - -test('Parse GROUP BY query with JOIN and WHERE clauses', () => { - const query = 'SELECT student.name, COUNT(*) FROM student INNER JOIN enrollment ON student.id = enrollment.student_id WHERE enrollment.course = "Mathematics" GROUP BY student.name'; - const parsed = parseSelectQuery(query); - expect(parsed).toEqual({ - fields: ['student.name', 'COUNT(*)'], - table: 'student', - whereClauses: [{ field: 'enrollment.course', operator: '=', value: '"Mathematics"' }], - groupByFields: ['student.name'], - joinType: 'INNER', - joinTable: 'enrollment', - joinCondition: { - left: 'student.id', - right: 'enrollment.student_id' - }, - hasAggregateWithoutGroupBy: false, - orderByFields: null, - "limit": null, - isDistinct: false, - }); -}); - -test('Execute SQL Query with ORDER BY', async () => { - const query = 'SELECT name FROM student ORDER BY name ASC'; - const result = await executeSELECTQuery(query); - - expect(result).toStrictEqual([ - { name: 'Alice' }, - { name: 'Bob' }, - { name: 'Jane' }, - { name: 'John' } - ]); -}); - -test('Execute SQL Query with ORDER BY and WHERE', async () => { - const query = 'SELECT name FROM student WHERE age > 24 ORDER BY name DESC'; - const result = await executeSELECTQuery(query); - - expect(result).toStrictEqual([ - { name: 'John' }, - { name: 'Jane' }, - ]); -}); -test('Execute SQL Query with ORDER BY and GROUP BY', async () => { - const query = 'SELECT COUNT(id) as count, age FROM student GROUP BY age ORDER BY age DESC'; - const result = await executeSELECTQuery(query); - - expect(result).toStrictEqual([ - { age: '30', 'COUNT(id) as count': 1 }, - { age: '25', 'COUNT(id) as count': 1 }, - { age: '24', 'COUNT(id) as count': 1 }, - { age: '22', 'COUNT(id) as count': 1 } - ]); -}); - -test('Execute SQL Query with standard LIMIT clause', async () => { - const query = 'SELECT id, name FROM student LIMIT 2'; - const result = await executeSELECTQuery(query); - expect(result.length).toEqual(2); -}); - -test('Execute SQL Query with LIMIT clause equal to total rows', async () => { - const query = 'SELECT id, name FROM student LIMIT 4'; - const result = await executeSELECTQuery(query); - expect(result.length).toEqual(4); -}); - -test('Execute SQL Query with LIMIT clause exceeding total rows', async () => { - const query = 'SELECT id, name FROM student LIMIT 10'; - const result = await executeSELECTQuery(query); - expect(result.length).toEqual(4); // Total rows in student.csv -}); - -test('Execute SQL Query with LIMIT 0', async () => { - const query = 'SELECT id, name FROM student LIMIT 0'; - const result = await executeSELECTQuery(query); - expect(result.length).toEqual(0); -}); - -test('Execute SQL Query with LIMIT and ORDER BY clause', async () => { - const query = 'SELECT id, name FROM student ORDER BY age DESC LIMIT 2'; - const result = await executeSELECTQuery(query); - expect(result.length).toEqual(2); - expect(result[0].name).toEqual('John'); - expect(result[1].name).toEqual('Jane'); -}); - -test('Error Handling with Malformed Query', async () => { - const query = 'SELECT FROM table'; // intentionally malformed - await expect(executeSELECTQuery(query)).rejects.toThrow("Error executing query: Query parsing error: Invalid SELECT format"); -}); - -test('Basic DISTINCT Usage', async () => { - const query = 'SELECT DISTINCT age FROM student'; - const result = await executeSELECTQuery(query); - expect(result).toEqual([{ age: '30' }, { age: '25' }, { age: '22' }, { age: '24' }]); -}); - -test('DISTINCT with Multiple Columns', async () => { - const query = 'SELECT DISTINCT student_id, course FROM enrollment'; - const result = await executeSELECTQuery(query); - // Expecting unique combinations of student_id and course - expect(result).toEqual([ - { student_id: '1', course: 'Mathematics' }, - { student_id: '1', course: 'Physics' }, - { student_id: '2', course: 'Chemistry' }, - { student_id: '3', course: 'Mathematics' }, - { student_id: '5', course: 'Biology' }, - ]); + ); +}); + +test("Execute SQL Query with LEFT JOIN", async () => { + const query = + "SELECT student.name, enrollment.course FROM student LEFT JOIN enrollment ON student.id=enrollment.student_id"; + const result = await executeSELECTQuery(query); + expect(result).toEqual( + expect.arrayContaining([ + expect.objectContaining({ + "student.name": "Alice", + "enrollment.course": null, + }), + expect.objectContaining({ + "student.name": "John", + "enrollment.course": "Mathematics", + }), + ]) + ); + expect(result.length).toEqual(5); // 4 students, but John appears twice +}); + +test("Execute SQL Query with RIGHT JOIN", async () => { + const query = + "SELECT student.name, enrollment.course FROM student RIGHT JOIN enrollment ON student.id=enrollment.student_id"; + const result = await executeSELECTQuery(query); + expect(result).toEqual( + expect.arrayContaining([ + expect.objectContaining({ + "student.name": null, + "enrollment.course": "Biology", + }), + expect.objectContaining({ + "student.name": "John", + "enrollment.course": "Mathematics", + }), + ]) + ); + expect(result.length).toEqual(5); // 4 courses, but Mathematics appears twice +}); + +test("Execute SQL Query with LEFT JOIN with a WHERE clause filtering the main table", async () => { + const query = + "SELECT student.name, enrollment.course FROM student LEFT JOIN enrollment ON student.id=enrollment.student_id WHERE student.age > 22"; + const result = await executeSELECTQuery(query); + expect(result).toEqual( + expect.arrayContaining([ + expect.objectContaining({ + "enrollment.course": "Mathematics", + "student.name": "John", + }), + expect.objectContaining({ + "enrollment.course": "Physics", + "student.name": "John", + }), + ]) + ); + expect(result.length).toEqual(4); +}); + +test("Execute SQL Query with LEFT JOIN with a WHERE clause filtering the join table", async () => { + const query = `SELECT student.name, enrollment.course FROM student LEFT JOIN enrollment ON student.id=enrollment.student_id WHERE enrollment.course = 'Physics'`; + const result = await executeSELECTQuery(query); + expect(result).toEqual( + expect.arrayContaining([ + expect.objectContaining({ + "student.name": "John", + "enrollment.course": "Physics", + }), + ]) + ); + expect(result.length).toEqual(1); +}); + +test("Execute SQL Query with RIGHT JOIN with a WHERE clause filtering the main table", async () => { + const query = + "SELECT student.name, enrollment.course FROM student RIGHT JOIN enrollment ON student.id=enrollment.student_id WHERE student.age < 25"; + const result = await executeSELECTQuery(query); + expect(result).toEqual( + expect.arrayContaining([ + expect.objectContaining({ + "enrollment.course": "Mathematics", + "student.name": "Bob", + }), + expect.objectContaining({ + "enrollment.course": "Biology", + "student.name": null, + }), + ]) + ); + expect(result.length).toEqual(2); +}); + +test("Execute SQL Query with RIGHT JOIN with a WHERE clause filtering the join table", async () => { + const query = `SELECT student.name, enrollment.course FROM student RIGHT JOIN enrollment ON student.id=enrollment.student_id WHERE enrollment.course = 'Chemistry'`; + const result = await executeSELECTQuery(query); + expect(result).toEqual( + expect.arrayContaining([ + expect.objectContaining({ + "enrollment.course": "Chemistry", + "student.name": "Jane", + }), + ]) + ); + expect(result.length).toEqual(1); +}); + +test("Execute SQL Query with RIGHT JOIN with a multiple WHERE clauses filtering the join table and main table", async () => { + const query = `SELECT student.name, enrollment.course FROM student RIGHT JOIN enrollment ON student.id=enrollment.student_id WHERE enrollment.course = 'Chemistry' AND student.age = 26`; + const result = await executeSELECTQuery(query); + expect(result).toEqual([]); +}); + +test("Execute COUNT Aggregate Query", async () => { + const query = "SELECT COUNT(*) FROM student"; + const result = await executeSELECTQuery(query); + expect(result).toEqual([{ "COUNT(*)": 4 }]); +}); + +test("Execute SUM Aggregate Query", async () => { + const query = "SELECT SUM(age) FROM student"; + const result = await executeSELECTQuery(query); + expect(result).toEqual([{ "SUM(age)": 101 }]); +}); + +test("Execute AVG Aggregate Query", async () => { + const query = "SELECT AVG(age) FROM student"; + const result = await executeSELECTQuery(query); + // Assuming AVG returns a single decimal point value + expect(result).toEqual([{ "AVG(age)": 25.25 }]); +}); + +test("Execute MIN Aggregate Query", async () => { + const query = "SELECT MIN(age) FROM student"; + const result = await executeSELECTQuery(query); + expect(result).toEqual([{ "MIN(age)": 22 }]); +}); + +test("Execute MAX Aggregate Query", async () => { + const query = "SELECT MAX(age) FROM student"; + const result = await executeSELECTQuery(query); + expect(result).toEqual([{ "MAX(age)": 30 }]); +}); + +test("Count students per age", async () => { + const query = "SELECT age, COUNT(*) FROM student GROUP BY age"; + const result = await executeSELECTQuery(query); + expect(result).toEqual([ + { age: "22", "COUNT(*)": 1 }, + { age: "24", "COUNT(*)": 1 }, + { age: "25", "COUNT(*)": 1 }, + { age: "30", "COUNT(*)": 1 }, + ]); +}); + +test("Count enrollments per course", async () => { + const query = "SELECT course, COUNT(*) FROM enrollment GROUP BY course"; + const result = await executeSELECTQuery(query); + expect(result).toEqual([ + { course: "Mathematics", "COUNT(*)": 2 }, + { course: "Physics", "COUNT(*)": 1 }, + { course: "Chemistry", "COUNT(*)": 1 }, + { course: "Biology", "COUNT(*)": 1 }, + ]); +}); + +test("Count courses per student", async () => { + const query = + "SELECT student_id, COUNT(*) FROM enrollment GROUP BY student_id"; + const result = await executeSELECTQuery(query); + expect(result).toEqual([ + { student_id: "1", "COUNT(*)": 2 }, + { student_id: "2", "COUNT(*)": 1 }, + { student_id: "3", "COUNT(*)": 1 }, + { student_id: "5", "COUNT(*)": 1 }, + ]); +}); + +test("Count students within a specific age range", async () => { + const query = "SELECT age, COUNT(*) FROM student WHERE age > 22 GROUP BY age"; + const result = await executeSELECTQuery(query); + expect(result).toEqual([ + { age: "24", "COUNT(*)": 1 }, + { age: "25", "COUNT(*)": 1 }, + { age: "30", "COUNT(*)": 1 }, + ]); +}); + +test("Count enrollments for a specific course", async () => { + const query = + 'SELECT course, COUNT(*) FROM enrollment WHERE course = "Mathematics" GROUP BY course'; + const result = await executeSELECTQuery(query); + expect(result).toEqual([{ course: "Mathematics", "COUNT(*)": 2 }]); +}); + +test("Count courses for a specific student", async () => { + const query = + "SELECT student_id, COUNT(*) FROM enrollment WHERE student_id = 1 GROUP BY student_id"; + const result = await executeSELECTQuery(query); + expect(result).toEqual([{ student_id: "1", "COUNT(*)": 2 }]); +}); + +test("Average age of students above a certain age", async () => { + const query = "SELECT AVG(age) FROM student WHERE age > 22"; + const result = await executeSELECTQuery(query); + const expectedAverage = (25 + 30 + 24) / 3; // Average age of students older than 22 + expect(result).toEqual([{ "AVG(age)": expectedAverage }]); +}); + +test("Parse SQL Query", () => { + const query = "SELECT id, name FROM student"; + const parsed = parseSelectQuery(query); + expect(parsed).toEqual({ + fields: ["id", "name"], + table: "student", + whereClauses: [], + joinCondition: null, + joinTable: null, + joinType: null, + groupByFields: null, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse SQL Query with WHERE Clause", () => { + const query = "SELECT id, name FROM student WHERE age = 25"; + const parsed = parseSelectQuery(query); + expect(parsed).toEqual({ + fields: ["id", "name"], + table: "student", + whereClauses: [ + { + field: "age", + operator: "=", + value: "25", + }, + ], + joinCondition: null, + joinTable: null, + joinType: null, + groupByFields: null, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse SQL Query with Multiple WHERE Clauses", () => { + const query = "SELECT id, name FROM student WHERE age = 30 AND name = John"; + const parsed = parseSelectQuery(query); + expect(parsed).toEqual({ + fields: ["id", "name"], + table: "student", + whereClauses: [ + { + field: "age", + operator: "=", + value: "30", + }, + { + field: "name", + operator: "=", + value: "John", + }, + ], + joinCondition: null, + joinTable: null, + joinType: null, + groupByFields: null, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse SQL Query with INNER JOIN", async () => { + const query = + "SELECT student.name, enrollment.course FROM student INNER JOIN enrollment ON student.id=enrollment.student_id"; + const result = await parseSelectQuery(query); + expect(result).toEqual({ + fields: ["student.name", "enrollment.course"], + table: "student", + whereClauses: [], + joinTable: "enrollment", + joinType: "INNER", + joinCondition: { left: "student.id", right: "enrollment.student_id" }, + groupByFields: null, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse SQL Query with INNER JOIN and WHERE Clause", async () => { + const query = + "SELECT student.name, enrollment.course FROM student INNER JOIN enrollment ON student.id = enrollment.student_id WHERE student.age > 20"; + const result = await parseSelectQuery(query); + expect(result).toEqual({ + fields: ["student.name", "enrollment.course"], + table: "student", + whereClauses: [{ field: "student.age", operator: ">", value: "20" }], + joinTable: "enrollment", + joinType: "INNER", + joinCondition: { left: "student.id", right: "enrollment.student_id" }, + groupByFields: null, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse INNER JOIN clause", () => { + const query = + "SELECT * FROM table1 INNER JOIN table2 ON table1.id = table2.ref_id"; + const result = parseJoinClause(query); + expect(result).toEqual({ + joinType: "INNER", + joinTable: "table2", + joinCondition: { left: "table1.id", right: "table2.ref_id" }, + }); +}); + +test("Parse LEFT JOIN clause", () => { + const query = + "SELECT * FROM table1 LEFT JOIN table2 ON table1.id = table2.ref_id"; + const result = parseJoinClause(query); + expect(result).toEqual({ + joinType: "LEFT", + joinTable: "table2", + joinCondition: { left: "table1.id", right: "table2.ref_id" }, + }); +}); + +test("Parse RIGHT JOIN clause", () => { + const query = + "SELECT * FROM table1 RIGHT JOIN table2 ON table1.id = table2.ref_id"; + const result = parseJoinClause(query); + expect(result).toEqual({ + joinType: "RIGHT", + joinTable: "table2", + joinCondition: { left: "table1.id", right: "table2.ref_id" }, + }); +}); + +test("Returns null for queries without JOIN", () => { + const query = "SELECT * FROM table1"; + const result = parseJoinClause(query); + expect(result).toEqual({ + joinType: null, + joinTable: null, + joinCondition: null, + }); +}); + +test("Parse LEFT Join Query Completely", () => { + const query = + "SELECT student.name, enrollment.course FROM student LEFT JOIN enrollment ON student.id=enrollment.student_id"; + const result = parseSelectQuery(query); + expect(result).toEqual({ + fields: ["student.name", "enrollment.course"], + table: "student", + whereClauses: [], + joinType: "LEFT", + joinTable: "enrollment", + joinCondition: { left: "student.id", right: "enrollment.student_id" }, + groupByFields: null, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse LEFT Join Query Completely", () => { + const query = + "SELECT student.name, enrollment.course FROM student RIGHT JOIN enrollment ON student.id=enrollment.student_id"; + const result = parseSelectQuery(query); + expect(result).toEqual({ + fields: ["student.name", "enrollment.course"], + table: "student", + whereClauses: [], + joinType: "RIGHT", + joinTable: "enrollment", + joinCondition: { left: "student.id", right: "enrollment.student_id" }, + groupByFields: null, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse SQL Query with LEFT JOIN with a WHERE clause filtering the main table", async () => { + const query = + "SELECT student.name, enrollment.course FROM student LEFT JOIN enrollment ON student.id=enrollment.student_id WHERE student.age > 22"; + const result = await parseSelectQuery(query); + expect(result).toEqual({ + fields: ["student.name", "enrollment.course"], + joinCondition: { left: "student.id", right: "enrollment.student_id" }, + joinTable: "enrollment", + joinType: "LEFT", + table: "student", + whereClauses: [{ field: "student.age", operator: ">", value: "22" }], + groupByFields: null, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse SQL Query with LEFT JOIN with a WHERE clause filtering the join table", async () => { + const query = `SELECT student.name, enrollment.course FROM student LEFT JOIN enrollment ON student.id=enrollment.student_id WHERE enrollment.course = 'Physics'`; + const result = await parseSelectQuery(query); + expect(result).toEqual({ + fields: ["student.name", "enrollment.course"], + joinCondition: { left: "student.id", right: "enrollment.student_id" }, + joinTable: "enrollment", + joinType: "LEFT", + table: "student", + whereClauses: [ + { field: "enrollment.course", operator: "=", value: "'Physics'" }, + ], + groupByFields: null, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse SQL Query with RIGHT JOIN with a WHERE clause filtering the main table", async () => { + const query = + "SELECT student.name, enrollment.course FROM student RIGHT JOIN enrollment ON student.id=enrollment.student_id WHERE student.age < 25"; + const result = await parseSelectQuery(query); + expect(result).toEqual({ + fields: ["student.name", "enrollment.course"], + joinCondition: { left: "student.id", right: "enrollment.student_id" }, + joinTable: "enrollment", + joinType: "RIGHT", + table: "student", + whereClauses: [{ field: "student.age", operator: "<", value: "25" }], + groupByFields: null, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse SQL Query with RIGHT JOIN with a WHERE clause filtering the join table", async () => { + const query = `SELECT student.name, enrollment.course FROM student RIGHT JOIN enrollment ON student.id=enrollment.student_id WHERE enrollment.course = 'Chemistry'`; + const result = await parseSelectQuery(query); + expect(result).toEqual({ + fields: ["student.name", "enrollment.course"], + joinCondition: { left: "student.id", right: "enrollment.student_id" }, + joinTable: "enrollment", + joinType: "RIGHT", + table: "student", + whereClauses: [ + { field: "enrollment.course", operator: "=", value: "'Chemistry'" }, + ], + groupByFields: null, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse COUNT Aggregate Query", () => { + const query = "SELECT COUNT(*) FROM student"; + const parsed = parseSelectQuery(query); + expect(parsed).toEqual({ + fields: ["COUNT(*)"], + table: "student", + whereClauses: [], + groupByFields: null, + hasAggregateWithoutGroupBy: true, + joinCondition: null, + joinTable: null, + joinType: null, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse SUM Aggregate Query", () => { + const query = "SELECT SUM(age) FROM student"; + const parsed = parseSelectQuery(query); + expect(parsed).toEqual({ + fields: ["SUM(age)"], + table: "student", + whereClauses: [], + groupByFields: null, + hasAggregateWithoutGroupBy: true, + joinCondition: null, + joinTable: null, + joinType: null, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse AVG Aggregate Query", () => { + const query = "SELECT AVG(age) FROM student"; + const parsed = parseSelectQuery(query); + expect(parsed).toEqual({ + fields: ["AVG(age)"], + table: "student", + whereClauses: [], + groupByFields: null, + hasAggregateWithoutGroupBy: true, + joinCondition: null, + joinTable: null, + joinType: null, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse MIN Aggregate Query", () => { + const query = "SELECT MIN(age) FROM student"; + const parsed = parseSelectQuery(query); + expect(parsed).toEqual({ + fields: ["MIN(age)"], + table: "student", + whereClauses: [], + groupByFields: null, + hasAggregateWithoutGroupBy: true, + joinCondition: null, + joinTable: null, + joinType: null, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse MAX Aggregate Query", () => { + const query = "SELECT MAX(age) FROM student"; + const parsed = parseSelectQuery(query); + expect(parsed).toEqual({ + fields: ["MAX(age)"], + table: "student", + whereClauses: [], + groupByFields: null, + hasAggregateWithoutGroupBy: true, + joinCondition: null, + joinTable: null, + joinType: null, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse basic GROUP BY query", () => { + const query = "SELECT age, COUNT(*) FROM student GROUP BY age"; + const parsed = parseSelectQuery(query); + expect(parsed).toEqual({ + fields: ["age", "COUNT(*)"], + table: "student", + whereClauses: [], + groupByFields: ["age"], + joinType: null, + joinTable: null, + joinCondition: null, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse GROUP BY query with WHERE clause", () => { + const query = "SELECT age, COUNT(*) FROM student WHERE age > 22 GROUP BY age"; + const parsed = parseSelectQuery(query); + expect(parsed).toEqual({ + fields: ["age", "COUNT(*)"], + table: "student", + whereClauses: [{ field: "age", operator: ">", value: "22" }], + groupByFields: ["age"], + joinType: null, + joinTable: null, + joinCondition: null, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse GROUP BY query with multiple fields", () => { + const query = + "SELECT student_id, course, COUNT(*) FROM enrollment GROUP BY student_id, course"; + const parsed = parseSelectQuery(query); + expect(parsed).toEqual({ + fields: ["student_id", "course", "COUNT(*)"], + table: "enrollment", + whereClauses: [], + groupByFields: ["student_id", "course"], + joinType: null, + joinTable: null, + joinCondition: null, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse GROUP BY query with JOIN and WHERE clauses", () => { + const query = + 'SELECT student.name, COUNT(*) FROM student INNER JOIN enrollment ON student.id = enrollment.student_id WHERE enrollment.course = "Mathematics" GROUP BY student.name'; + const parsed = parseSelectQuery(query); + expect(parsed).toEqual({ + fields: ["student.name", "COUNT(*)"], + table: "student", + whereClauses: [ + { field: "enrollment.course", operator: "=", value: '"Mathematics"' }, + ], + groupByFields: ["student.name"], + joinType: "INNER", + joinTable: "enrollment", + joinCondition: { + left: "student.id", + right: "enrollment.student_id", + }, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Execute SQL Query with ORDER BY", async () => { + const query = "SELECT name FROM student ORDER BY name ASC"; + const result = await executeSELECTQuery(query); + + expect(result).toStrictEqual([ + { name: "Alice" }, + { name: "Bob" }, + { name: "Jane" }, + { name: "John" }, + ]); +}); + +test("Execute SQL Query with ORDER BY and WHERE", async () => { + const query = "SELECT name FROM student WHERE age > 24 ORDER BY name DESC"; + const result = await executeSELECTQuery(query); + + expect(result).toStrictEqual([{ name: "John" }, { name: "Jane" }]); +}); +test("Execute SQL Query with ORDER BY and GROUP BY", async () => { + const query = + "SELECT COUNT(id) as count, age FROM student GROUP BY age ORDER BY age DESC"; + const result = await executeSELECTQuery(query); + + expect(result).toStrictEqual([ + { age: "30", "COUNT(id) as count": 1 }, + { age: "25", "COUNT(id) as count": 1 }, + { age: "24", "COUNT(id) as count": 1 }, + { age: "22", "COUNT(id) as count": 1 }, + ]); +}); + +test("Execute SQL Query with standard LIMIT clause", async () => { + const query = "SELECT id, name FROM student LIMIT 2"; + const result = await executeSELECTQuery(query); + expect(result.length).toEqual(2); +}); + +test("Execute SQL Query with LIMIT clause equal to total rows", async () => { + const query = "SELECT id, name FROM student LIMIT 4"; + const result = await executeSELECTQuery(query); + expect(result.length).toEqual(4); +}); + +test("Execute SQL Query with LIMIT clause exceeding total rows", async () => { + const query = "SELECT id, name FROM student LIMIT 10"; + const result = await executeSELECTQuery(query); + expect(result.length).toEqual(4); // Total rows in student.csv +}); + +test("Execute SQL Query with LIMIT 0", async () => { + const query = "SELECT id, name FROM student LIMIT 0"; + const result = await executeSELECTQuery(query); + expect(result.length).toEqual(0); +}); + +test("Execute SQL Query with LIMIT and ORDER BY clause", async () => { + const query = "SELECT id, name FROM student ORDER BY age DESC LIMIT 2"; + const result = await executeSELECTQuery(query); + expect(result.length).toEqual(2); + expect(result[0].name).toEqual("John"); + expect(result[1].name).toEqual("Jane"); +}); + +test("Error Handling with Malformed Query", async () => { + const query = "SELECT FROM table"; // intentionally malformed + await expect(executeSELECTQuery(query)).rejects.toThrow( + "Error executing query: Query parsing error: Invalid SELECT format" + ); +}); + +test("Basic DISTINCT Usage", async () => { + const query = "SELECT DISTINCT age FROM student"; + const result = await executeSELECTQuery(query); + expect(result).toEqual([ + { age: "30" }, + { age: "25" }, + { age: "22" }, + { age: "24" }, + ]); +}); + +test("DISTINCT with Multiple Columns", async () => { + const query = "SELECT DISTINCT student_id, course FROM enrollment"; + const result = await executeSELECTQuery(query); + // Expecting unique combinations of student_id and course + expect(result).toEqual([ + { student_id: "1", course: "Mathematics" }, + { student_id: "1", course: "Physics" }, + { student_id: "2", course: "Chemistry" }, + { student_id: "3", course: "Mathematics" }, + { student_id: "5", course: "Biology" }, + ]); }); // Not a good test right now -test('DISTINCT with WHERE Clause', async () => { - const query = 'SELECT DISTINCT course FROM enrollment WHERE student_id = "1"'; - const result = await executeSELECTQuery(query); - // Expecting courses taken by student with ID 1 - expect(result).toEqual([{ course: 'Mathematics' }, { course: 'Physics' }]); +test("DISTINCT with WHERE Clause", async () => { + const query = 'SELECT DISTINCT course FROM enrollment WHERE student_id = "1"'; + const result = await executeSELECTQuery(query); + // Expecting courses taken by student with ID 1 + expect(result).toEqual([{ course: "Mathematics" }, { course: "Physics" }]); }); -test('DISTINCT with JOIN Operations', async () => { - const query = 'SELECT DISTINCT student.name FROM student INNER JOIN enrollment ON student.id = enrollment.student_id'; - const result = await executeSELECTQuery(query); - // Expecting names of students who are enrolled in any course - expect(result).toEqual([{ "student.name": 'John' }, { "student.name": 'Jane' }, { "student.name": 'Bob' }]); +test("DISTINCT with JOIN Operations", async () => { + const query = + "SELECT DISTINCT student.name FROM student INNER JOIN enrollment ON student.id = enrollment.student_id"; + const result = await executeSELECTQuery(query); + // Expecting names of students who are enrolled in any course + expect(result).toEqual([ + { "student.name": "John" }, + { "student.name": "Jane" }, + { "student.name": "Bob" }, + ]); }); -test('DISTINCT with ORDER BY and LIMIT', async () => { - const query = 'SELECT DISTINCT age FROM student ORDER BY age DESC LIMIT 2'; - const result = await executeSELECTQuery(query); - // Expecting the two highest unique ages - expect(result).toEqual([{ age: '30' }, { age: '25' }]); +test("DISTINCT with ORDER BY and LIMIT", async () => { + const query = "SELECT DISTINCT age FROM student ORDER BY age DESC LIMIT 2"; + const result = await executeSELECTQuery(query); + // Expecting the two highest unique ages + expect(result).toEqual([{ age: "30" }, { age: "25" }]); }); -test('Execute SQL Query with LIKE Operator for Name', async () => { - const query = "SELECT name FROM student WHERE name LIKE '%Jane%'"; - const result = await executeSELECTQuery(query); - // Expecting names containing 'Jane' - expect(result).toEqual([{ name: 'Jane' }]); +test("Execute SQL Query with LIKE Operator for Name", async () => { + const query = "SELECT name FROM student WHERE name LIKE '%Jane%'"; + const result = await executeSELECTQuery(query); + // Expecting names containing 'Jane' + expect(result).toEqual([{ name: "Jane" }]); }); -test('Execute SQL Query with LIKE Operator and Wildcards', async () => { - const query = "SELECT name FROM student WHERE name LIKE 'J%'"; - const result = await executeSELECTQuery(query); - // Expecting names starting with 'J' - expect(result).toEqual([{ name: 'John' }, { name: 'Jane' }]); +test("Execute SQL Query with LIKE Operator and Wildcards", async () => { + const query = "SELECT name FROM student WHERE name LIKE 'J%'"; + const result = await executeSELECTQuery(query); + // Expecting names starting with 'J' + expect(result).toEqual([{ name: "John" }, { name: "Jane" }]); }); -test('Execute SQL Query with LIKE Operator Case Insensitive', async () => { - const query = "SELECT name FROM student WHERE name LIKE '%bob%'"; - const result = await executeSELECTQuery(query); - // Expecting names 'Bob' (case insensitive) - expect(result).toEqual([{ name: 'Bob' }]); +test("Execute SQL Query with LIKE Operator Case Insensitive", async () => { + const query = "SELECT name FROM student WHERE name LIKE '%bob%'"; + const result = await executeSELECTQuery(query); + // Expecting names 'Bob' (case insensitive) + expect(result).toEqual([{ name: "Bob" }]); }); -test('Execute SQL Query with LIKE Operator and DISTINCT', async () => { - const query = "SELECT DISTINCT name FROM student WHERE name LIKE '%e%'"; - const result = await executeSELECTQuery(query); - // Expecting unique names containing 'e' - expect(result).toEqual([{ name: 'Jane' }, { name: 'Alice' }]); +test("Execute SQL Query with LIKE Operator and DISTINCT", async () => { + const query = "SELECT DISTINCT name FROM student WHERE name LIKE '%e%'"; + const result = await executeSELECTQuery(query); + // Expecting unique names containing 'e' + expect(result).toEqual([{ name: "Jane" }, { name: "Alice" }]); }); -test('LIKE with ORDER BY and LIMIT', async () => { - const query = "SELECT name FROM student WHERE name LIKE '%a%' ORDER BY name ASC LIMIT 2"; - const result = await executeSELECTQuery(query); - // Expecting the first two names alphabetically that contain 'a' - expect(result).toEqual([{ name: 'Alice' }, { name: 'Jane' }]); -}); \ No newline at end of file +test("LIKE with ORDER BY and LIMIT", async () => { + const query = + "SELECT name FROM student WHERE name LIKE '%a%' ORDER BY name ASC LIMIT 2"; + const result = await executeSELECTQuery(query); + // Expecting the first two names alphabetically that contain 'a' + expect(result).toEqual([{ name: "Alice" }, { name: "Jane" }]); +}); diff --git a/tests/step-18/insertExecuter.test.js b/tests/step-18/insertExecuter.test.js index 8c405f727..64a957f32 100644 --- a/tests/step-18/insertExecuter.test.js +++ b/tests/step-18/insertExecuter.test.js @@ -1,33 +1,36 @@ -const { executeINSERTQuery } = require('../../src/index'); -const { readCSV, writeCSV } = require('../../src/csvReader'); -const fs = require('fs'); +const { executeINSERTQuery } = require("../../src/queryExecutor"); +const { readCSV, writeCSV } = require("../../src/csvReader"); +const fs = require("fs"); // Helper function to create grades.csv with initial data async function createGradesCSV() { - const initialData = [ - { student_id: '1', course: 'Mathematics', grade: 'A' }, - { student_id: '2', course: 'Chemistry', grade: 'B' }, - { student_id: '3', course: 'Mathematics', grade: 'C' } - ]; - await writeCSV('grades.csv', initialData); + const initialData = [ + { student_id: "1", course: "Mathematics", grade: "A" }, + { student_id: "2", course: "Chemistry", grade: "B" }, + { student_id: "3", course: "Mathematics", grade: "C" }, + ]; + await writeCSV("grades.csv", initialData); } // Test to INSERT a new grade and verify -test('Execute INSERT INTO Query for grades.csv', async () => { - // Create grades.csv with initial data - await createGradesCSV(); +test("Execute INSERT INTO Query for grades.csv", async () => { + // Create grades.csv with initial data + await createGradesCSV(); - // Execute INSERT statement - const insertQuery = "INSERT INTO grades (student_id, course, grade) VALUES ('4', 'Physics', 'A')"; - await executeINSERTQuery(insertQuery); + // Execute INSERT statement + const insertQuery = + "INSERT INTO grades (student_id, course, grade) VALUES ('4', 'Physics', 'A')"; + await executeINSERTQuery(insertQuery); - // Verify the new entry - const updatedData = await readCSV('grades.csv'); - const newEntry = updatedData.find(row => row.student_id === '4' && row.course === 'Physics'); - console.log(updatedData) - expect(newEntry).toBeDefined(); - expect(newEntry.grade).toEqual('A'); + // Verify the new entry + const updatedData = await readCSV("grades.csv"); + const newEntry = updatedData.find( + (row) => row.student_id === "4" && row.course === "Physics" + ); + console.log(updatedData); + expect(newEntry).toBeDefined(); + expect(newEntry.grade).toEqual("A"); - // Cleanup: Delete grades.csv - fs.unlinkSync('grades.csv'); -}); \ No newline at end of file + // Cleanup: Delete grades.csv + fs.unlinkSync("grades.csv"); +}); diff --git a/tests/step-19/deleteExecutor.test.js b/tests/step-19/deleteExecutor.test.js index 11ae617b7..0e53a921e 100644 --- a/tests/step-19/deleteExecutor.test.js +++ b/tests/step-19/deleteExecutor.test.js @@ -1,31 +1,31 @@ -const { executeDELETEQuery } = require('../../src/index'); -const { readCSV, writeCSV } = require('../../src/csvReader'); -const fs = require('fs'); +const { executeDELETEQuery } = require("../../src/queryExecutor"); +const { readCSV, writeCSV } = require("../../src/csvReader"); +const fs = require("fs"); // Helper function to create courses.csv with initial data async function createCoursesCSV() { - const initialData = [ - { course_id: '1', course_name: 'Mathematics', instructor: 'Dr. Smith' }, - { course_id: '2', course_name: 'Chemistry', instructor: 'Dr. Jones' }, - { course_id: '3', course_name: 'Physics', instructor: 'Dr. Taylor' } - ]; - await writeCSV('courses.csv', initialData); + const initialData = [ + { course_id: "1", course_name: "Mathematics", instructor: "Dr. Smith" }, + { course_id: "2", course_name: "Chemistry", instructor: "Dr. Jones" }, + { course_id: "3", course_name: "Physics", instructor: "Dr. Taylor" }, + ]; + await writeCSV("courses.csv", initialData); } // Test to DELETE a course and verify -test('Execute DELETE FROM Query for courses.csv', async () => { - // Create courses.csv with initial data - await createCoursesCSV(); +test("Execute DELETE FROM Query for courses.csv", async () => { + // Create courses.csv with initial data + await createCoursesCSV(); - // Execute DELETE statement - const deleteQuery = "DELETE FROM courses WHERE course_id = '2'"; - await executeDELETEQuery(deleteQuery); + // Execute DELETE statement + const deleteQuery = "DELETE FROM courses WHERE course_id = '2'"; + await executeDELETEQuery(deleteQuery); - // Verify the course was removed - const updatedData = await readCSV('courses.csv'); - const deletedCourse = updatedData.find(course => course.course_id === '2'); - expect(deletedCourse).toBeUndefined(); + // Verify the course was removed + const updatedData = await readCSV("courses.csv"); + const deletedCourse = updatedData.find((course) => course.course_id === "2"); + expect(deletedCourse).toBeUndefined(); - // Cleanup: Delete courses.csv - fs.unlinkSync('courses.csv'); -}); \ No newline at end of file + // Cleanup: Delete courses.csv + fs.unlinkSync("courses.csv"); +}); diff --git a/tests/step-19/index.test.js b/tests/step-19/index.test.js index c99d01fbb..bd272e907 100644 --- a/tests/step-19/index.test.js +++ b/tests/step-19/index.test.js @@ -1,59 +1,60 @@ -const {readCSV} = require('../../src/csvReader'); -const {executeSELECTQuery } = require('../../src/index'); -const { parseJoinClause, parseSelectQuery } = require('../../src/queryParser'); - -test('Read CSV File', async () => { - const data = await readCSV('./student.csv'); - expect(data.length).toBeGreaterThan(0); - expect(data.length).toBe(4); - expect(data[0].name).toBe('John'); - expect(data[0].age).toBe('30'); //ignore the string type here, we will fix this later -}); - -test('Execute SQL Query', async () => { - const query = 'SELECT id, name FROM student'; - const result = await executeSELECTQuery(query); - expect(result.length).toBeGreaterThan(0); - expect(result[0]).toHaveProperty('id'); - expect(result[0]).toHaveProperty('name'); - expect(result[0]).not.toHaveProperty('age'); - expect(result[0]).toEqual({ id: '1', name: 'John' }); -}); - -test('Execute SQL Query with WHERE Clause', async () => { - const query = 'SELECT id, name FROM student WHERE age = 25'; - const result = await executeSELECTQuery(query); - expect(result.length).toBe(1); - expect(result[0]).toHaveProperty('id'); - expect(result[0]).toHaveProperty('name'); - expect(result[0].id).toBe('2'); -}); - -test('Execute SQL Query with Complex WHERE Clause', async () => { - const query = 'SELECT id, name FROM student WHERE age = 30 AND name = John'; - const result = await executeSELECTQuery(query); - expect(result.length).toBe(1); - expect(result[0]).toEqual({ id: '1', name: 'John' }); -}); - -test('Execute SQL Query with Greater Than', async () => { - const queryWithGT = 'SELECT id FROM student WHERE age > 22'; - const result = await executeSELECTQuery(queryWithGT); - expect(result.length).toEqual(3); - expect(result[0]).toHaveProperty('id'); -}); - -test('Execute SQL Query with Not Equal to', async () => { - const queryWithGT = 'SELECT name FROM student WHERE age != 25'; - const result = await executeSELECTQuery(queryWithGT); - expect(result.length).toEqual(3); - expect(result[0]).toHaveProperty('name'); -}); - -test('Execute SQL Query with INNER JOIN', async () => { - const query = 'SELECT student.name, enrollment.course FROM student INNER JOIN enrollment ON student.id=enrollment.student_id'; - const result = await executeSELECTQuery(query); - /* +const { readCSV } = require("../../src/csvReader"); +const { executeSELECTQuery } = require("../../src/queryExecutor"); +const { parseJoinClause, parseSelectQuery } = require("../../src/queryParser"); + +test("Read CSV File", async () => { + const data = await readCSV("./student.csv"); + expect(data.length).toBeGreaterThan(0); + expect(data.length).toBe(4); + expect(data[0].name).toBe("John"); + expect(data[0].age).toBe("30"); //ignore the string type here, we will fix this later +}); + +test("Execute SQL Query", async () => { + const query = "SELECT id, name FROM student"; + const result = await executeSELECTQuery(query); + expect(result.length).toBeGreaterThan(0); + expect(result[0]).toHaveProperty("id"); + expect(result[0]).toHaveProperty("name"); + expect(result[0]).not.toHaveProperty("age"); + expect(result[0]).toEqual({ id: "1", name: "John" }); +}); + +test("Execute SQL Query with WHERE Clause", async () => { + const query = "SELECT id, name FROM student WHERE age = 25"; + const result = await executeSELECTQuery(query); + expect(result.length).toBe(1); + expect(result[0]).toHaveProperty("id"); + expect(result[0]).toHaveProperty("name"); + expect(result[0].id).toBe("2"); +}); + +test("Execute SQL Query with Complex WHERE Clause", async () => { + const query = "SELECT id, name FROM student WHERE age = 30 AND name = John"; + const result = await executeSELECTQuery(query); + expect(result.length).toBe(1); + expect(result[0]).toEqual({ id: "1", name: "John" }); +}); + +test("Execute SQL Query with Greater Than", async () => { + const queryWithGT = "SELECT id FROM student WHERE age > 22"; + const result = await executeSELECTQuery(queryWithGT); + expect(result.length).toEqual(3); + expect(result[0]).toHaveProperty("id"); +}); + +test("Execute SQL Query with Not Equal to", async () => { + const queryWithGT = "SELECT name FROM student WHERE age != 25"; + const result = await executeSELECTQuery(queryWithGT); + expect(result.length).toEqual(3); + expect(result[0]).toHaveProperty("name"); +}); + +test("Execute SQL Query with INNER JOIN", async () => { + const query = + "SELECT student.name, enrollment.course FROM student INNER JOIN enrollment ON student.id=enrollment.student_id"; + const result = await executeSELECTQuery(query); + /* result = [ { 'student.name': 'John', 'enrollment.course': 'Mathematics' }, { 'student.name': 'John', 'enrollment.course': 'Physics' }, @@ -61,762 +62,834 @@ test('Execute SQL Query with INNER JOIN', async () => { { 'student.name': 'Bob', 'enrollment.course': 'Mathematics' } ] */ - expect(result.length).toEqual(4); - // toHaveProperty is not working here due to dot in the property name - expect(result[0]).toEqual(expect.objectContaining({ - "enrollment.course": "Mathematics", - "student.name": "John" - })); + expect(result.length).toEqual(4); + // toHaveProperty is not working here due to dot in the property name + expect(result[0]).toEqual( + expect.objectContaining({ + "enrollment.course": "Mathematics", + "student.name": "John", + }) + ); }); -test('Execute SQL Query with INNER JOIN and a WHERE Clause', async () => { - const query = 'SELECT student.name, enrollment.course, student.age FROM student INNER JOIN enrollment ON student.id = enrollment.student_id WHERE student.age > 25'; - const result = await executeSELECTQuery(query); - /* +test("Execute SQL Query with INNER JOIN and a WHERE Clause", async () => { + const query = + "SELECT student.name, enrollment.course, student.age FROM student INNER JOIN enrollment ON student.id = enrollment.student_id WHERE student.age > 25"; + const result = await executeSELECTQuery(query); + /* result = [ { 'student.name': 'John', - 'enrollment.course': 'Mathematics', - 'student.age': '30' - }, - { - 'student.name': 'John', - 'enrollment.course': 'Physics', - 'student.age': '30' + @@ -86,737 +90,812 @@ test('Execute SQL Query with INNER JOIN and a WHERE Clause', async () => { } ] */ - expect(result.length).toEqual(2); - // toHaveProperty is not working here due to dot in the property name - expect(result[0]).toEqual(expect.objectContaining({ - "enrollment.course": "Mathematics", - "student.name": "John" - })); -}); - -test('Execute SQL Query with LEFT JOIN', async () => { - const query = 'SELECT student.name, enrollment.course FROM student LEFT JOIN enrollment ON student.id=enrollment.student_id'; - const result = await executeSELECTQuery(query); - expect(result).toEqual(expect.arrayContaining([ - expect.objectContaining({ "student.name": "Alice", "enrollment.course": null }), - expect.objectContaining({ "student.name": "John", "enrollment.course": "Mathematics" }) - ])); - expect(result.length).toEqual(5); // 4 students, but John appears twice -}); - -test('Execute SQL Query with RIGHT JOIN', async () => { - const query = 'SELECT student.name, enrollment.course FROM student RIGHT JOIN enrollment ON student.id=enrollment.student_id'; - const result = await executeSELECTQuery(query); - expect(result).toEqual(expect.arrayContaining([ - expect.objectContaining({ "student.name": null, "enrollment.course": "Biology" }), - expect.objectContaining({ "student.name": "John", "enrollment.course": "Mathematics" }) - ])); - expect(result.length).toEqual(5); // 4 courses, but Mathematics appears twice -}); - -test('Execute SQL Query with LEFT JOIN with a WHERE clause filtering the main table', async () => { - const query = 'SELECT student.name, enrollment.course FROM student LEFT JOIN enrollment ON student.id=enrollment.student_id WHERE student.age > 22'; - const result = await executeSELECTQuery(query); - expect(result).toEqual(expect.arrayContaining([ - expect.objectContaining({ "enrollment.course": "Mathematics", "student.name": "John" }), - expect.objectContaining({ "enrollment.course": "Physics", "student.name": "John" }) - ])); - expect(result.length).toEqual(4); -}); - -test('Execute SQL Query with LEFT JOIN with a WHERE clause filtering the join table', async () => { - const query = `SELECT student.name, enrollment.course FROM student LEFT JOIN enrollment ON student.id=enrollment.student_id WHERE enrollment.course = 'Physics'`; - const result = await executeSELECTQuery(query); - expect(result).toEqual(expect.arrayContaining([ - expect.objectContaining({ "student.name": "John", "enrollment.course": "Physics" }) - ])); - expect(result.length).toEqual(1); -}); - -test('Execute SQL Query with RIGHT JOIN with a WHERE clause filtering the main table', async () => { - const query = 'SELECT student.name, enrollment.course FROM student RIGHT JOIN enrollment ON student.id=enrollment.student_id WHERE student.age < 25'; - const result = await executeSELECTQuery(query); - expect(result).toEqual(expect.arrayContaining([ - expect.objectContaining({ "enrollment.course": "Mathematics", "student.name": "Bob" }), - expect.objectContaining({ "enrollment.course": "Biology", "student.name": null }) - ])); - expect(result.length).toEqual(2); -}); - -test('Execute SQL Query with RIGHT JOIN with a WHERE clause filtering the join table', async () => { - const query = `SELECT student.name, enrollment.course FROM student RIGHT JOIN enrollment ON student.id=enrollment.student_id WHERE enrollment.course = 'Chemistry'`; - const result = await executeSELECTQuery(query); - expect(result).toEqual(expect.arrayContaining([ - expect.objectContaining({ "enrollment.course": "Chemistry", "student.name": "Jane" }), - ])); - expect(result.length).toEqual(1); -}); - -test('Execute SQL Query with RIGHT JOIN with a multiple WHERE clauses filtering the join table and main table', async () => { - const query = `SELECT student.name, enrollment.course FROM student RIGHT JOIN enrollment ON student.id=enrollment.student_id WHERE enrollment.course = 'Chemistry' AND student.age = 26`; - const result = await executeSELECTQuery(query); - expect(result).toEqual([]); -}); - -test('Execute COUNT Aggregate Query', async () => { - const query = 'SELECT COUNT(*) FROM student'; - const result = await executeSELECTQuery(query); - expect(result).toEqual([{ 'COUNT(*)': 4 }]); -}); - -test('Execute SUM Aggregate Query', async () => { - const query = 'SELECT SUM(age) FROM student'; - const result = await executeSELECTQuery(query); - expect(result).toEqual([{ 'SUM(age)': 101 }]); -}); - -test('Execute AVG Aggregate Query', async () => { - const query = 'SELECT AVG(age) FROM student'; - const result = await executeSELECTQuery(query); - // Assuming AVG returns a single decimal point value - expect(result).toEqual([{ 'AVG(age)': 25.25 }]); -}); - -test('Execute MIN Aggregate Query', async () => { - const query = 'SELECT MIN(age) FROM student'; - const result = await executeSELECTQuery(query); - expect(result).toEqual([{ 'MIN(age)': 22 }]); -}); - -test('Execute MAX Aggregate Query', async () => { - const query = 'SELECT MAX(age) FROM student'; - const result = await executeSELECTQuery(query); - expect(result).toEqual([{ 'MAX(age)': 30 }]); -}); - -test('Count students per age', async () => { - const query = 'SELECT age, COUNT(*) FROM student GROUP BY age'; - const result = await executeSELECTQuery(query); - expect(result).toEqual([ - { age: '22', 'COUNT(*)': 1 }, - { age: '24', 'COUNT(*)': 1 }, - { age: '25', 'COUNT(*)': 1 }, - { age: '30', 'COUNT(*)': 1 } - ]); -}); - -test('Count enrollments per course', async () => { - const query = 'SELECT course, COUNT(*) FROM enrollment GROUP BY course'; - const result = await executeSELECTQuery(query); - expect(result).toEqual([ - { course: 'Mathematics', 'COUNT(*)': 2 }, - { course: 'Physics', 'COUNT(*)': 1 }, - { course: 'Chemistry', 'COUNT(*)': 1 }, - { course: 'Biology', 'COUNT(*)': 1 } - ]); -}); - - -test('Count courses per student', async () => { - const query = 'SELECT student_id, COUNT(*) FROM enrollment GROUP BY student_id'; - const result = await executeSELECTQuery(query); - expect(result).toEqual([ - { student_id: '1', 'COUNT(*)': 2 }, - { student_id: '2', 'COUNT(*)': 1 }, - { student_id: '3', 'COUNT(*)': 1 }, - { student_id: '5', 'COUNT(*)': 1 } - ]); -}); - -test('Count students within a specific age range', async () => { - const query = 'SELECT age, COUNT(*) FROM student WHERE age > 22 GROUP BY age'; - const result = await executeSELECTQuery(query); - expect(result).toEqual([ - { age: '24', 'COUNT(*)': 1 }, - { age: '25', 'COUNT(*)': 1 }, - { age: '30', 'COUNT(*)': 1 } - ]); -}); - -test('Count enrollments for a specific course', async () => { - const query = 'SELECT course, COUNT(*) FROM enrollment WHERE course = "Mathematics" GROUP BY course'; - const result = await executeSELECTQuery(query); - expect(result).toEqual([ - { course: 'Mathematics', 'COUNT(*)': 2 } - ]); -}); - -test('Count courses for a specific student', async () => { - const query = 'SELECT student_id, COUNT(*) FROM enrollment WHERE student_id = 1 GROUP BY student_id'; - const result = await executeSELECTQuery(query); - expect(result).toEqual([ - { student_id: '1', 'COUNT(*)': 2 } - ]); -}); - -test('Average age of students above a certain age', async () => { - const query = 'SELECT AVG(age) FROM student WHERE age > 22'; - const result = await executeSELECTQuery(query); - const expectedAverage = (25 + 30 + 24) / 3; // Average age of students older than 22 - expect(result).toEqual([{ 'AVG(age)': expectedAverage }]); -}); - -test('Parse SQL Query', () => { - const query = 'SELECT id, name FROM student'; - const parsed = parseSelectQuery(query); - expect(parsed).toEqual({ - fields: ['id', 'name'], - table: 'student', - whereClauses: [], - joinCondition: null, - joinTable: null, - joinType: null, - groupByFields: null, - hasAggregateWithoutGroupBy: false, - "orderByFields": null, - "limit": null, - isDistinct: false - }); -}); - -test('Parse SQL Query with WHERE Clause', () => { - const query = 'SELECT id, name FROM student WHERE age = 25'; - const parsed = parseSelectQuery(query); - expect(parsed).toEqual({ - fields: ['id', 'name'], - table: 'student', - whereClauses: [{ - "field": "age", - "operator": "=", - "value": "25", - }], - joinCondition: null, - joinTable: null, - joinType: null, - groupByFields: null, - hasAggregateWithoutGroupBy: false, - "orderByFields": null, - "limit": null, - isDistinct: false - }); -}); - -test('Parse SQL Query with Multiple WHERE Clauses', () => { - const query = 'SELECT id, name FROM student WHERE age = 30 AND name = John'; - const parsed = parseSelectQuery(query); - expect(parsed).toEqual({ - fields: ['id', 'name'], - table: 'student', - whereClauses: [{ - "field": "age", - "operator": "=", - "value": "30", - }, { - "field": "name", - "operator": "=", - "value": "John", - }], - joinCondition: null, - joinTable: null, - joinType: null, - groupByFields: null, - hasAggregateWithoutGroupBy: false, - "orderByFields": null, - "limit": null, - isDistinct: false - }); -}); - -test('Parse SQL Query with INNER JOIN', async () => { - const query = 'SELECT student.name, enrollment.course FROM student INNER JOIN enrollment ON student.id=enrollment.student_id'; - const result = await parseSelectQuery(query); - expect(result).toEqual({ - fields: ['student.name', 'enrollment.course'], - table: 'student', - whereClauses: [], - joinTable: 'enrollment', - joinType: "INNER", - joinCondition: { left: 'student.id', right: 'enrollment.student_id' }, - groupByFields: null, - hasAggregateWithoutGroupBy: false, - "orderByFields": null, - "limit": null, - isDistinct: false - }) -}); - -test('Parse SQL Query with INNER JOIN and WHERE Clause', async () => { - const query = 'SELECT student.name, enrollment.course FROM student INNER JOIN enrollment ON student.id = enrollment.student_id WHERE student.age > 20'; - const result = await parseSelectQuery(query); - expect(result).toEqual({ - fields: ['student.name', 'enrollment.course'], - table: 'student', - whereClauses: [{ field: 'student.age', operator: '>', value: '20' }], - joinTable: 'enrollment', - joinType: "INNER", - joinCondition: { left: 'student.id', right: 'enrollment.student_id' }, - groupByFields: null, - hasAggregateWithoutGroupBy: false, - "orderByFields": null, - "limit": null, - isDistinct: false - }) -}); - -test('Parse INNER JOIN clause', () => { - const query = 'SELECT * FROM table1 INNER JOIN table2 ON table1.id = table2.ref_id'; - const result = parseJoinClause(query); - expect(result).toEqual({ - joinType: 'INNER', - joinTable: 'table2', - joinCondition: { left: 'table1.id', right: 'table2.ref_id' }, - }); -}); - -test('Parse LEFT JOIN clause', () => { - const query = 'SELECT * FROM table1 LEFT JOIN table2 ON table1.id = table2.ref_id'; - const result = parseJoinClause(query); - expect(result).toEqual({ - joinType: 'LEFT', - joinTable: 'table2', - joinCondition: { left: 'table1.id', right: 'table2.ref_id' } - }); -}); - -test('Parse RIGHT JOIN clause', () => { - const query = 'SELECT * FROM table1 RIGHT JOIN table2 ON table1.id = table2.ref_id'; - const result = parseJoinClause(query); - expect(result).toEqual({ - joinType: 'RIGHT', - joinTable: 'table2', - joinCondition: { left: 'table1.id', right: 'table2.ref_id' } - }); -}); - -test('Returns null for queries without JOIN', () => { - const query = 'SELECT * FROM table1'; - const result = parseJoinClause(query); - expect(result).toEqual( - { - joinType: null, - joinTable: null, - joinCondition: null - } - ); -}); - -test('Parse LEFT Join Query Completely', () => { - const query = 'SELECT student.name, enrollment.course FROM student LEFT JOIN enrollment ON student.id=enrollment.student_id'; - const result = parseSelectQuery(query); - expect(result).toEqual({ - fields: ['student.name', 'enrollment.course'], - table: 'student', - whereClauses: [], - joinType: 'LEFT', - joinTable: 'enrollment', - joinCondition: { left: 'student.id', right: 'enrollment.student_id' }, - groupByFields: null, - hasAggregateWithoutGroupBy: false, - "orderByFields": null, - "limit": null, - isDistinct: false - }) -}) - -test('Parse LEFT Join Query Completely', () => { - const query = 'SELECT student.name, enrollment.course FROM student RIGHT JOIN enrollment ON student.id=enrollment.student_id'; - const result = parseSelectQuery(query); - expect(result).toEqual({ - fields: ['student.name', 'enrollment.course'], - table: 'student', - whereClauses: [], - joinType: 'RIGHT', - joinTable: 'enrollment', - joinCondition: { left: 'student.id', right: 'enrollment.student_id' }, - groupByFields: null, - hasAggregateWithoutGroupBy: false, - "orderByFields": null, - "limit": null, - isDistinct: false + expect(result.length).toEqual(2); + // toHaveProperty is not working here due to dot in the property name + expect(result[0]).toEqual( + expect.objectContaining({ + "enrollment.course": "Mathematics", + "student.name": "John", }) -}) - -test('Parse SQL Query with LEFT JOIN with a WHERE clause filtering the main table', async () => { - const query = 'SELECT student.name, enrollment.course FROM student LEFT JOIN enrollment ON student.id=enrollment.student_id WHERE student.age > 22'; - const result = await parseSelectQuery(query); - expect(result).toEqual({ - "fields": ["student.name", "enrollment.course"], - "joinCondition": { "left": "student.id", "right": "enrollment.student_id" }, - "joinTable": "enrollment", - "joinType": "LEFT", - "table": "student", - "whereClauses": [{ "field": "student.age", "operator": ">", "value": "22" }], - groupByFields: null, - hasAggregateWithoutGroupBy: false, - "orderByFields": null, - "limit": null, - isDistinct: false - }); -}); - -test('Parse SQL Query with LEFT JOIN with a WHERE clause filtering the join table', async () => { - const query = `SELECT student.name, enrollment.course FROM student LEFT JOIN enrollment ON student.id=enrollment.student_id WHERE enrollment.course = 'Physics'`; - const result = await parseSelectQuery(query); - expect(result).toEqual({ - "fields": ["student.name", "enrollment.course"], - "joinCondition": { "left": "student.id", "right": "enrollment.student_id" }, - "joinTable": "enrollment", - "joinType": "LEFT", - "table": "student", - "whereClauses": [{ "field": "enrollment.course", "operator": "=", "value": "'Physics'" }], - groupByFields: null, - hasAggregateWithoutGroupBy: false, - "orderByFields": null, - "limit": null, - isDistinct: false - }); -}); - -test('Parse SQL Query with RIGHT JOIN with a WHERE clause filtering the main table', async () => { - const query = 'SELECT student.name, enrollment.course FROM student RIGHT JOIN enrollment ON student.id=enrollment.student_id WHERE student.age < 25'; - const result = await parseSelectQuery(query); - expect(result).toEqual({ - "fields": ["student.name", "enrollment.course"], - "joinCondition": { "left": "student.id", "right": "enrollment.student_id" }, - "joinTable": "enrollment", - "joinType": "RIGHT", - "table": "student", - "whereClauses": [{ "field": "student.age", "operator": "<", "value": "25" }], - groupByFields: null, - hasAggregateWithoutGroupBy: false, - "orderByFields": null, - "limit": null, - isDistinct: false - }); -}); - -test('Parse SQL Query with RIGHT JOIN with a WHERE clause filtering the join table', async () => { - const query = `SELECT student.name, enrollment.course FROM student RIGHT JOIN enrollment ON student.id=enrollment.student_id WHERE enrollment.course = 'Chemistry'`; - const result = await parseSelectQuery(query); - expect(result).toEqual({ - "fields": ["student.name", "enrollment.course"], - "joinCondition": { "left": "student.id", "right": "enrollment.student_id" }, - "joinTable": "enrollment", - "joinType": "RIGHT", - "table": "student", - "whereClauses": [{ "field": "enrollment.course", "operator": "=", "value": "'Chemistry'" }], - groupByFields: null, - hasAggregateWithoutGroupBy: false, - "orderByFields": null, - "limit": null, - isDistinct: false - }); -}); - - -test('Parse COUNT Aggregate Query', () => { - const query = 'SELECT COUNT(*) FROM student'; - const parsed = parseSelectQuery(query); - expect(parsed).toEqual({ - fields: ['COUNT(*)'], - table: 'student', - whereClauses: [], - groupByFields: null, - hasAggregateWithoutGroupBy: true, - "joinCondition": null, - "joinTable": null, - "joinType": null, - "orderByFields": null, - "limit": null, - isDistinct: false - }); -}); - - -test('Parse SUM Aggregate Query', () => { - const query = 'SELECT SUM(age) FROM student'; - const parsed = parseSelectQuery(query); - expect(parsed).toEqual({ - fields: ['SUM(age)'], - table: 'student', - whereClauses: [], - groupByFields: null, - hasAggregateWithoutGroupBy: true, - "joinCondition": null, - "joinTable": null, - "joinType": null, - "orderByFields": null, - "limit": null, - isDistinct: false - }); -}); - -test('Parse AVG Aggregate Query', () => { - const query = 'SELECT AVG(age) FROM student'; - const parsed = parseSelectQuery(query); - expect(parsed).toEqual({ - fields: ['AVG(age)'], - table: 'student', - whereClauses: [], - groupByFields: null, - hasAggregateWithoutGroupBy: true, - "joinCondition": null, - "joinTable": null, - "joinType": null, - "orderByFields": null, - "limit": null, - isDistinct: false - }); -}); - -test('Parse MIN Aggregate Query', () => { - const query = 'SELECT MIN(age) FROM student'; - const parsed = parseSelectQuery(query); - expect(parsed).toEqual({ - fields: ['MIN(age)'], - table: 'student', - whereClauses: [], - groupByFields: null, - hasAggregateWithoutGroupBy: true, - "joinCondition": null, - "joinTable": null, - "joinType": null, - "orderByFields": null, - "limit": null, - isDistinct: false - }); -}); - -test('Parse MAX Aggregate Query', () => { - const query = 'SELECT MAX(age) FROM student'; - const parsed = parseSelectQuery(query); - expect(parsed).toEqual({ - fields: ['MAX(age)'], - table: 'student', - whereClauses: [], - groupByFields: null, - hasAggregateWithoutGroupBy: true, - "joinCondition": null, - "joinTable": null, - "joinType": null, - "orderByFields": null, - "limit": null, - isDistinct: false - }); -}); - -test('Parse basic GROUP BY query', () => { - const query = 'SELECT age, COUNT(*) FROM student GROUP BY age'; - const parsed = parseSelectQuery(query); - expect(parsed).toEqual({ - fields: ['age', 'COUNT(*)'], - table: 'student', - whereClauses: [], - groupByFields: ['age'], - joinType: null, - joinTable: null, - joinCondition: null, - hasAggregateWithoutGroupBy: false, - orderByFields: null, - "limit": null, - isDistinct: false - }); -}); - -test('Parse GROUP BY query with WHERE clause', () => { - const query = 'SELECT age, COUNT(*) FROM student WHERE age > 22 GROUP BY age'; - const parsed = parseSelectQuery(query); - expect(parsed).toEqual({ - fields: ['age', 'COUNT(*)'], - table: 'student', - whereClauses: [{ field: 'age', operator: '>', value: '22' }], - groupByFields: ['age'], - joinType: null, - joinTable: null, - joinCondition: null, - hasAggregateWithoutGroupBy: false, - orderByFields: null, - "limit": null, - isDistinct: false - }); -}); - -test('Parse GROUP BY query with multiple fields', () => { - const query = 'SELECT student_id, course, COUNT(*) FROM enrollment GROUP BY student_id, course'; - const parsed = parseSelectQuery(query); - expect(parsed).toEqual({ - fields: ['student_id', 'course', 'COUNT(*)'], - table: 'enrollment', - whereClauses: [], - groupByFields: ['student_id', 'course'], - joinType: null, - joinTable: null, - joinCondition: null, - hasAggregateWithoutGroupBy: false, - orderByFields: null, - "limit": null, - isDistinct: false - }); -}); - -test('Parse GROUP BY query with JOIN and WHERE clauses', () => { - const query = 'SELECT student.name, COUNT(*) FROM student INNER JOIN enrollment ON student.id = enrollment.student_id WHERE enrollment.course = "Mathematics" GROUP BY student.name'; - const parsed = parseSelectQuery(query); - expect(parsed).toEqual({ - fields: ['student.name', 'COUNT(*)'], - table: 'student', - whereClauses: [{ field: 'enrollment.course', operator: '=', value: '"Mathematics"' }], - groupByFields: ['student.name'], - joinType: 'INNER', - joinTable: 'enrollment', - joinCondition: { - left: 'student.id', - right: 'enrollment.student_id' - }, - hasAggregateWithoutGroupBy: false, - orderByFields: null, - "limit": null, - isDistinct: false, - }); -}); - -test('Execute SQL Query with ORDER BY', async () => { - const query = 'SELECT name FROM student ORDER BY name ASC'; - const result = await executeSELECTQuery(query); - - expect(result).toStrictEqual([ - { name: 'Alice' }, - { name: 'Bob' }, - { name: 'Jane' }, - { name: 'John' } - ]); -}); - -test('Execute SQL Query with ORDER BY and WHERE', async () => { - const query = 'SELECT name FROM student WHERE age > 24 ORDER BY name DESC'; - const result = await executeSELECTQuery(query); - - expect(result).toStrictEqual([ - { name: 'John' }, - { name: 'Jane' }, - ]); -}); -test('Execute SQL Query with ORDER BY and GROUP BY', async () => { - const query = 'SELECT COUNT(id) as count, age FROM student GROUP BY age ORDER BY age DESC'; - const result = await executeSELECTQuery(query); - - expect(result).toStrictEqual([ - { age: '30', 'COUNT(id) as count': 1 }, - { age: '25', 'COUNT(id) as count': 1 }, - { age: '24', 'COUNT(id) as count': 1 }, - { age: '22', 'COUNT(id) as count': 1 } - ]); -}); - -test('Execute SQL Query with standard LIMIT clause', async () => { - const query = 'SELECT id, name FROM student LIMIT 2'; - const result = await executeSELECTQuery(query); - expect(result.length).toEqual(2); -}); - -test('Execute SQL Query with LIMIT clause equal to total rows', async () => { - const query = 'SELECT id, name FROM student LIMIT 4'; - const result = await executeSELECTQuery(query); - expect(result.length).toEqual(4); -}); - -test('Execute SQL Query with LIMIT clause exceeding total rows', async () => { - const query = 'SELECT id, name FROM student LIMIT 10'; - const result = await executeSELECTQuery(query); - expect(result.length).toEqual(4); // Total rows in student.csv -}); - -test('Execute SQL Query with LIMIT 0', async () => { - const query = 'SELECT id, name FROM student LIMIT 0'; - const result = await executeSELECTQuery(query); - expect(result.length).toEqual(0); -}); - -test('Execute SQL Query with LIMIT and ORDER BY clause', async () => { - const query = 'SELECT id, name FROM student ORDER BY age DESC LIMIT 2'; - const result = await executeSELECTQuery(query); - expect(result.length).toEqual(2); - expect(result[0].name).toEqual('John'); - expect(result[1].name).toEqual('Jane'); -}); - -test('Error Handling with Malformed Query', async () => { - const query = 'SELECT FROM table'; // intentionally malformed - await expect(executeSELECTQuery(query)).rejects.toThrow("Error executing query: Query parsing error: Invalid SELECT format"); -}); - -test('Basic DISTINCT Usage', async () => { - const query = 'SELECT DISTINCT age FROM student'; - const result = await executeSELECTQuery(query); - expect(result).toEqual([{ age: '30' }, { age: '25' }, { age: '22' }, { age: '24' }]); -}); - -test('DISTINCT with Multiple Columns', async () => { - const query = 'SELECT DISTINCT student_id, course FROM enrollment'; - const result = await executeSELECTQuery(query); - // Expecting unique combinations of student_id and course - expect(result).toEqual([ - { student_id: '1', course: 'Mathematics' }, - { student_id: '1', course: 'Physics' }, - { student_id: '2', course: 'Chemistry' }, - { student_id: '3', course: 'Mathematics' }, - { student_id: '5', course: 'Biology' }, - ]); + ); +}); + +test("Execute SQL Query with LEFT JOIN", async () => { + const query = + "SELECT student.name, enrollment.course FROM student LEFT JOIN enrollment ON student.id=enrollment.student_id"; + const result = await executeSELECTQuery(query); + expect(result).toEqual( + expect.arrayContaining([ + expect.objectContaining({ + "student.name": "Alice", + "enrollment.course": null, + }), + expect.objectContaining({ + "student.name": "John", + "enrollment.course": "Mathematics", + }), + ]) + ); + expect(result.length).toEqual(5); // 4 students, but John appears twice +}); + +test("Execute SQL Query with RIGHT JOIN", async () => { + const query = + "SELECT student.name, enrollment.course FROM student RIGHT JOIN enrollment ON student.id=enrollment.student_id"; + const result = await executeSELECTQuery(query); + expect(result).toEqual( + expect.arrayContaining([ + expect.objectContaining({ + "student.name": null, + "enrollment.course": "Biology", + }), + expect.objectContaining({ + "student.name": "John", + "enrollment.course": "Mathematics", + }), + ]) + ); + expect(result.length).toEqual(5); // 4 courses, but Mathematics appears twice +}); + +test("Execute SQL Query with LEFT JOIN with a WHERE clause filtering the main table", async () => { + const query = + "SELECT student.name, enrollment.course FROM student LEFT JOIN enrollment ON student.id=enrollment.student_id WHERE student.age > 22"; + const result = await executeSELECTQuery(query); + expect(result).toEqual( + expect.arrayContaining([ + expect.objectContaining({ + "enrollment.course": "Mathematics", + "student.name": "John", + }), + expect.objectContaining({ + "enrollment.course": "Physics", + "student.name": "John", + }), + ]) + ); + expect(result.length).toEqual(4); +}); + +test("Execute SQL Query with LEFT JOIN with a WHERE clause filtering the join table", async () => { + const query = `SELECT student.name, enrollment.course FROM student LEFT JOIN enrollment ON student.id=enrollment.student_id WHERE enrollment.course = 'Physics'`; + const result = await executeSELECTQuery(query); + expect(result).toEqual( + expect.arrayContaining([ + expect.objectContaining({ + "student.name": "John", + "enrollment.course": "Physics", + }), + ]) + ); + expect(result.length).toEqual(1); +}); + +test("Execute SQL Query with RIGHT JOIN with a WHERE clause filtering the main table", async () => { + const query = + "SELECT student.name, enrollment.course FROM student RIGHT JOIN enrollment ON student.id=enrollment.student_id WHERE student.age < 25"; + const result = await executeSELECTQuery(query); + expect(result).toEqual( + expect.arrayContaining([ + expect.objectContaining({ + "enrollment.course": "Mathematics", + "student.name": "Bob", + }), + expect.objectContaining({ + "enrollment.course": "Biology", + "student.name": null, + }), + ]) + ); + expect(result.length).toEqual(2); +}); + +test("Execute SQL Query with RIGHT JOIN with a WHERE clause filtering the join table", async () => { + const query = `SELECT student.name, enrollment.course FROM student RIGHT JOIN enrollment ON student.id=enrollment.student_id WHERE enrollment.course = 'Chemistry'`; + const result = await executeSELECTQuery(query); + expect(result).toEqual( + expect.arrayContaining([ + expect.objectContaining({ + "enrollment.course": "Chemistry", + "student.name": "Jane", + }), + ]) + ); + expect(result.length).toEqual(1); +}); + +test("Execute SQL Query with RIGHT JOIN with a multiple WHERE clauses filtering the join table and main table", async () => { + const query = `SELECT student.name, enrollment.course FROM student RIGHT JOIN enrollment ON student.id=enrollment.student_id WHERE enrollment.course = 'Chemistry' AND student.age = 26`; + const result = await executeSELECTQuery(query); + expect(result).toEqual([]); +}); + +test("Execute COUNT Aggregate Query", async () => { + const query = "SELECT COUNT(*) FROM student"; + const result = await executeSELECTQuery(query); + expect(result).toEqual([{ "COUNT(*)": 4 }]); +}); + +test("Execute SUM Aggregate Query", async () => { + const query = "SELECT SUM(age) FROM student"; + const result = await executeSELECTQuery(query); + expect(result).toEqual([{ "SUM(age)": 101 }]); +}); + +test("Execute AVG Aggregate Query", async () => { + const query = "SELECT AVG(age) FROM student"; + const result = await executeSELECTQuery(query); + // Assuming AVG returns a single decimal point value + expect(result).toEqual([{ "AVG(age)": 25.25 }]); +}); + +test("Execute MIN Aggregate Query", async () => { + const query = "SELECT MIN(age) FROM student"; + const result = await executeSELECTQuery(query); + expect(result).toEqual([{ "MIN(age)": 22 }]); +}); + +test("Execute MAX Aggregate Query", async () => { + const query = "SELECT MAX(age) FROM student"; + const result = await executeSELECTQuery(query); + expect(result).toEqual([{ "MAX(age)": 30 }]); +}); + +test("Count students per age", async () => { + const query = "SELECT age, COUNT(*) FROM student GROUP BY age"; + const result = await executeSELECTQuery(query); + expect(result).toEqual([ + { age: "22", "COUNT(*)": 1 }, + { age: "24", "COUNT(*)": 1 }, + { age: "25", "COUNT(*)": 1 }, + { age: "30", "COUNT(*)": 1 }, + ]); +}); + +test("Count enrollments per course", async () => { + const query = "SELECT course, COUNT(*) FROM enrollment GROUP BY course"; + const result = await executeSELECTQuery(query); + expect(result).toEqual([ + { course: "Mathematics", "COUNT(*)": 2 }, + { course: "Physics", "COUNT(*)": 1 }, + { course: "Chemistry", "COUNT(*)": 1 }, + { course: "Biology", "COUNT(*)": 1 }, + ]); +}); + +test("Count courses per student", async () => { + const query = + "SELECT student_id, COUNT(*) FROM enrollment GROUP BY student_id"; + const result = await executeSELECTQuery(query); + expect(result).toEqual([ + { student_id: "1", "COUNT(*)": 2 }, + { student_id: "2", "COUNT(*)": 1 }, + { student_id: "3", "COUNT(*)": 1 }, + { student_id: "5", "COUNT(*)": 1 }, + ]); +}); + +test("Count students within a specific age range", async () => { + const query = "SELECT age, COUNT(*) FROM student WHERE age > 22 GROUP BY age"; + const result = await executeSELECTQuery(query); + expect(result).toEqual([ + { age: "24", "COUNT(*)": 1 }, + { age: "25", "COUNT(*)": 1 }, + { age: "30", "COUNT(*)": 1 }, + ]); +}); + +test("Count enrollments for a specific course", async () => { + const query = + 'SELECT course, COUNT(*) FROM enrollment WHERE course = "Mathematics" GROUP BY course'; + const result = await executeSELECTQuery(query); + expect(result).toEqual([{ course: "Mathematics", "COUNT(*)": 2 }]); +}); + +test("Count courses for a specific student", async () => { + const query = + "SELECT student_id, COUNT(*) FROM enrollment WHERE student_id = 1 GROUP BY student_id"; + const result = await executeSELECTQuery(query); + expect(result).toEqual([{ student_id: "1", "COUNT(*)": 2 }]); +}); + +test("Average age of students above a certain age", async () => { + const query = "SELECT AVG(age) FROM student WHERE age > 22"; + const result = await executeSELECTQuery(query); + const expectedAverage = (25 + 30 + 24) / 3; // Average age of students older than 22 + expect(result).toEqual([{ "AVG(age)": expectedAverage }]); +}); + +test("Parse SQL Query", () => { + const query = "SELECT id, name FROM student"; + const parsed = parseSelectQuery(query); + expect(parsed).toEqual({ + fields: ["id", "name"], + table: "student", + whereClauses: [], + joinCondition: null, + joinTable: null, + joinType: null, + groupByFields: null, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse SQL Query with WHERE Clause", () => { + const query = "SELECT id, name FROM student WHERE age = 25"; + const parsed = parseSelectQuery(query); + expect(parsed).toEqual({ + fields: ["id", "name"], + table: "student", + whereClauses: [ + { + field: "age", + operator: "=", + value: "25", + }, + ], + joinCondition: null, + joinTable: null, + joinType: null, + groupByFields: null, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse SQL Query with Multiple WHERE Clauses", () => { + const query = "SELECT id, name FROM student WHERE age = 30 AND name = John"; + const parsed = parseSelectQuery(query); + expect(parsed).toEqual({ + fields: ["id", "name"], + table: "student", + whereClauses: [ + { + field: "age", + operator: "=", + value: "30", + }, + { + field: "name", + operator: "=", + value: "John", + }, + ], + joinCondition: null, + joinTable: null, + joinType: null, + groupByFields: null, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse SQL Query with INNER JOIN", async () => { + const query = + "SELECT student.name, enrollment.course FROM student INNER JOIN enrollment ON student.id=enrollment.student_id"; + const result = await parseSelectQuery(query); + expect(result).toEqual({ + fields: ["student.name", "enrollment.course"], + table: "student", + whereClauses: [], + joinTable: "enrollment", + joinType: "INNER", + joinCondition: { left: "student.id", right: "enrollment.student_id" }, + groupByFields: null, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse SQL Query with INNER JOIN and WHERE Clause", async () => { + const query = + "SELECT student.name, enrollment.course FROM student INNER JOIN enrollment ON student.id = enrollment.student_id WHERE student.age > 20"; + const result = await parseSelectQuery(query); + expect(result).toEqual({ + fields: ["student.name", "enrollment.course"], + table: "student", + whereClauses: [{ field: "student.age", operator: ">", value: "20" }], + joinTable: "enrollment", + joinType: "INNER", + joinCondition: { left: "student.id", right: "enrollment.student_id" }, + groupByFields: null, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse INNER JOIN clause", () => { + const query = + "SELECT * FROM table1 INNER JOIN table2 ON table1.id = table2.ref_id"; + const result = parseJoinClause(query); + expect(result).toEqual({ + joinType: "INNER", + joinTable: "table2", + joinCondition: { left: "table1.id", right: "table2.ref_id" }, + }); +}); + +test("Parse LEFT JOIN clause", () => { + const query = + "SELECT * FROM table1 LEFT JOIN table2 ON table1.id = table2.ref_id"; + const result = parseJoinClause(query); + expect(result).toEqual({ + joinType: "LEFT", + joinTable: "table2", + joinCondition: { left: "table1.id", right: "table2.ref_id" }, + }); +}); + +test("Parse RIGHT JOIN clause", () => { + const query = + "SELECT * FROM table1 RIGHT JOIN table2 ON table1.id = table2.ref_id"; + const result = parseJoinClause(query); + expect(result).toEqual({ + joinType: "RIGHT", + joinTable: "table2", + joinCondition: { left: "table1.id", right: "table2.ref_id" }, + }); +}); + +test("Returns null for queries without JOIN", () => { + const query = "SELECT * FROM table1"; + const result = parseJoinClause(query); + expect(result).toEqual({ + joinType: null, + joinTable: null, + joinCondition: null, + }); +}); + +test("Parse LEFT Join Query Completely", () => { + const query = + "SELECT student.name, enrollment.course FROM student LEFT JOIN enrollment ON student.id=enrollment.student_id"; + const result = parseSelectQuery(query); + expect(result).toEqual({ + fields: ["student.name", "enrollment.course"], + table: "student", + whereClauses: [], + joinType: "LEFT", + joinTable: "enrollment", + joinCondition: { left: "student.id", right: "enrollment.student_id" }, + groupByFields: null, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse LEFT Join Query Completely", () => { + const query = + "SELECT student.name, enrollment.course FROM student RIGHT JOIN enrollment ON student.id=enrollment.student_id"; + const result = parseSelectQuery(query); + expect(result).toEqual({ + fields: ["student.name", "enrollment.course"], + table: "student", + whereClauses: [], + joinType: "RIGHT", + joinTable: "enrollment", + joinCondition: { left: "student.id", right: "enrollment.student_id" }, + groupByFields: null, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse SQL Query with LEFT JOIN with a WHERE clause filtering the main table", async () => { + const query = + "SELECT student.name, enrollment.course FROM student LEFT JOIN enrollment ON student.id=enrollment.student_id WHERE student.age > 22"; + const result = await parseSelectQuery(query); + expect(result).toEqual({ + fields: ["student.name", "enrollment.course"], + joinCondition: { left: "student.id", right: "enrollment.student_id" }, + joinTable: "enrollment", + joinType: "LEFT", + table: "student", + whereClauses: [{ field: "student.age", operator: ">", value: "22" }], + groupByFields: null, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse SQL Query with LEFT JOIN with a WHERE clause filtering the join table", async () => { + const query = `SELECT student.name, enrollment.course FROM student LEFT JOIN enrollment ON student.id=enrollment.student_id WHERE enrollment.course = 'Physics'`; + const result = await parseSelectQuery(query); + expect(result).toEqual({ + fields: ["student.name", "enrollment.course"], + joinCondition: { left: "student.id", right: "enrollment.student_id" }, + joinTable: "enrollment", + joinType: "LEFT", + table: "student", + whereClauses: [ + { field: "enrollment.course", operator: "=", value: "'Physics'" }, + ], + groupByFields: null, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse SQL Query with RIGHT JOIN with a WHERE clause filtering the main table", async () => { + const query = + "SELECT student.name, enrollment.course FROM student RIGHT JOIN enrollment ON student.id=enrollment.student_id WHERE student.age < 25"; + const result = await parseSelectQuery(query); + expect(result).toEqual({ + fields: ["student.name", "enrollment.course"], + joinCondition: { left: "student.id", right: "enrollment.student_id" }, + joinTable: "enrollment", + joinType: "RIGHT", + table: "student", + whereClauses: [{ field: "student.age", operator: "<", value: "25" }], + groupByFields: null, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse SQL Query with RIGHT JOIN with a WHERE clause filtering the join table", async () => { + const query = `SELECT student.name, enrollment.course FROM student RIGHT JOIN enrollment ON student.id=enrollment.student_id WHERE enrollment.course = 'Chemistry'`; + const result = await parseSelectQuery(query); + expect(result).toEqual({ + fields: ["student.name", "enrollment.course"], + joinCondition: { left: "student.id", right: "enrollment.student_id" }, + joinTable: "enrollment", + joinType: "RIGHT", + table: "student", + whereClauses: [ + { field: "enrollment.course", operator: "=", value: "'Chemistry'" }, + ], + groupByFields: null, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse COUNT Aggregate Query", () => { + const query = "SELECT COUNT(*) FROM student"; + const parsed = parseSelectQuery(query); + expect(parsed).toEqual({ + fields: ["COUNT(*)"], + table: "student", + whereClauses: [], + groupByFields: null, + hasAggregateWithoutGroupBy: true, + joinCondition: null, + joinTable: null, + joinType: null, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse SUM Aggregate Query", () => { + const query = "SELECT SUM(age) FROM student"; + const parsed = parseSelectQuery(query); + expect(parsed).toEqual({ + fields: ["SUM(age)"], + table: "student", + whereClauses: [], + groupByFields: null, + hasAggregateWithoutGroupBy: true, + joinCondition: null, + joinTable: null, + joinType: null, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse AVG Aggregate Query", () => { + const query = "SELECT AVG(age) FROM student"; + const parsed = parseSelectQuery(query); + expect(parsed).toEqual({ + fields: ["AVG(age)"], + table: "student", + whereClauses: [], + groupByFields: null, + hasAggregateWithoutGroupBy: true, + joinCondition: null, + joinTable: null, + joinType: null, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse MIN Aggregate Query", () => { + const query = "SELECT MIN(age) FROM student"; + const parsed = parseSelectQuery(query); + expect(parsed).toEqual({ + fields: ["MIN(age)"], + table: "student", + whereClauses: [], + groupByFields: null, + hasAggregateWithoutGroupBy: true, + joinCondition: null, + joinTable: null, + joinType: null, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse MAX Aggregate Query", () => { + const query = "SELECT MAX(age) FROM student"; + const parsed = parseSelectQuery(query); + expect(parsed).toEqual({ + fields: ["MAX(age)"], + table: "student", + whereClauses: [], + groupByFields: null, + hasAggregateWithoutGroupBy: true, + joinCondition: null, + joinTable: null, + joinType: null, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse basic GROUP BY query", () => { + const query = "SELECT age, COUNT(*) FROM student GROUP BY age"; + const parsed = parseSelectQuery(query); + expect(parsed).toEqual({ + fields: ["age", "COUNT(*)"], + table: "student", + whereClauses: [], + groupByFields: ["age"], + joinType: null, + joinTable: null, + joinCondition: null, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse GROUP BY query with WHERE clause", () => { + const query = "SELECT age, COUNT(*) FROM student WHERE age > 22 GROUP BY age"; + const parsed = parseSelectQuery(query); + expect(parsed).toEqual({ + fields: ["age", "COUNT(*)"], + table: "student", + whereClauses: [{ field: "age", operator: ">", value: "22" }], + groupByFields: ["age"], + joinType: null, + joinTable: null, + joinCondition: null, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse GROUP BY query with multiple fields", () => { + const query = + "SELECT student_id, course, COUNT(*) FROM enrollment GROUP BY student_id, course"; + const parsed = parseSelectQuery(query); + expect(parsed).toEqual({ + fields: ["student_id", "course", "COUNT(*)"], + table: "enrollment", + whereClauses: [], + groupByFields: ["student_id", "course"], + joinType: null, + joinTable: null, + joinCondition: null, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Parse GROUP BY query with JOIN and WHERE clauses", () => { + const query = + 'SELECT student.name, COUNT(*) FROM student INNER JOIN enrollment ON student.id = enrollment.student_id WHERE enrollment.course = "Mathematics" GROUP BY student.name'; + const parsed = parseSelectQuery(query); + expect(parsed).toEqual({ + fields: ["student.name", "COUNT(*)"], + table: "student", + whereClauses: [ + { field: "enrollment.course", operator: "=", value: '"Mathematics"' }, + ], + groupByFields: ["student.name"], + joinType: "INNER", + joinTable: "enrollment", + joinCondition: { + left: "student.id", + right: "enrollment.student_id", + }, + hasAggregateWithoutGroupBy: false, + orderByFields: null, + limit: null, + isDistinct: false, + }); +}); + +test("Execute SQL Query with ORDER BY", async () => { + const query = "SELECT name FROM student ORDER BY name ASC"; + const result = await executeSELECTQuery(query); + + expect(result).toStrictEqual([ + { name: "Alice" }, + { name: "Bob" }, + { name: "Jane" }, + { name: "John" }, + ]); +}); + +test("Execute SQL Query with ORDER BY and WHERE", async () => { + const query = "SELECT name FROM student WHERE age > 24 ORDER BY name DESC"; + const result = await executeSELECTQuery(query); + + expect(result).toStrictEqual([{ name: "John" }, { name: "Jane" }]); +}); +test("Execute SQL Query with ORDER BY and GROUP BY", async () => { + const query = + "SELECT COUNT(id) as count, age FROM student GROUP BY age ORDER BY age DESC"; + const result = await executeSELECTQuery(query); + + expect(result).toStrictEqual([ + { age: "30", "COUNT(id) as count": 1 }, + { age: "25", "COUNT(id) as count": 1 }, + { age: "24", "COUNT(id) as count": 1 }, + { age: "22", "COUNT(id) as count": 1 }, + ]); +}); + +test("Execute SQL Query with standard LIMIT clause", async () => { + const query = "SELECT id, name FROM student LIMIT 2"; + const result = await executeSELECTQuery(query); + expect(result.length).toEqual(2); +}); + +test("Execute SQL Query with LIMIT clause equal to total rows", async () => { + const query = "SELECT id, name FROM student LIMIT 4"; + const result = await executeSELECTQuery(query); + expect(result.length).toEqual(4); +}); + +test("Execute SQL Query with LIMIT clause exceeding total rows", async () => { + const query = "SELECT id, name FROM student LIMIT 10"; + const result = await executeSELECTQuery(query); + expect(result.length).toEqual(4); // Total rows in student.csv +}); + +test("Execute SQL Query with LIMIT 0", async () => { + const query = "SELECT id, name FROM student LIMIT 0"; + const result = await executeSELECTQuery(query); + expect(result.length).toEqual(0); +}); + +test("Execute SQL Query with LIMIT and ORDER BY clause", async () => { + const query = "SELECT id, name FROM student ORDER BY age DESC LIMIT 2"; + const result = await executeSELECTQuery(query); + expect(result.length).toEqual(2); + expect(result[0].name).toEqual("John"); + expect(result[1].name).toEqual("Jane"); +}); + +test("Error Handling with Malformed Query", async () => { + const query = "SELECT FROM table"; // intentionally malformed + await expect(executeSELECTQuery(query)).rejects.toThrow( + "Error executing query: Query parsing error: Invalid SELECT format" + ); +}); + +test("Basic DISTINCT Usage", async () => { + const query = "SELECT DISTINCT age FROM student"; + const result = await executeSELECTQuery(query); + expect(result).toEqual([ + { age: "30" }, + { age: "25" }, + { age: "22" }, + { age: "24" }, + ]); +}); + +test("DISTINCT with Multiple Columns", async () => { + const query = "SELECT DISTINCT student_id, course FROM enrollment"; + const result = await executeSELECTQuery(query); + // Expecting unique combinations of student_id and course + expect(result).toEqual([ + { student_id: "1", course: "Mathematics" }, + { student_id: "1", course: "Physics" }, + { student_id: "2", course: "Chemistry" }, + { student_id: "3", course: "Mathematics" }, + { student_id: "5", course: "Biology" }, + ]); }); // Not a good test right now -test('DISTINCT with WHERE Clause', async () => { - const query = 'SELECT DISTINCT course FROM enrollment WHERE student_id = "1"'; - const result = await executeSELECTQuery(query); - // Expecting courses taken by student with ID 1 - expect(result).toEqual([{ course: 'Mathematics' }, { course: 'Physics' }]); +test("DISTINCT with WHERE Clause", async () => { + const query = 'SELECT DISTINCT course FROM enrollment WHERE student_id = "1"'; + const result = await executeSELECTQuery(query); + // Expecting courses taken by student with ID 1 + expect(result).toEqual([{ course: "Mathematics" }, { course: "Physics" }]); }); -test('DISTINCT with JOIN Operations', async () => { - const query = 'SELECT DISTINCT student.name FROM student INNER JOIN enrollment ON student.id = enrollment.student_id'; - const result = await executeSELECTQuery(query); - // Expecting names of students who are enrolled in any course - expect(result).toEqual([{ "student.name": 'John' }, { "student.name": 'Jane' }, { "student.name": 'Bob' }]); +test("DISTINCT with JOIN Operations", async () => { + const query = + "SELECT DISTINCT student.name FROM student INNER JOIN enrollment ON student.id = enrollment.student_id"; + const result = await executeSELECTQuery(query); + // Expecting names of students who are enrolled in any course + expect(result).toEqual([ + { "student.name": "John" }, + { "student.name": "Jane" }, + { "student.name": "Bob" }, + ]); }); -test('DISTINCT with ORDER BY and LIMIT', async () => { - const query = 'SELECT DISTINCT age FROM student ORDER BY age DESC LIMIT 2'; - const result = await executeSELECTQuery(query); - // Expecting the two highest unique ages - expect(result).toEqual([{ age: '30' }, { age: '25' }]); +test("DISTINCT with ORDER BY and LIMIT", async () => { + const query = "SELECT DISTINCT age FROM student ORDER BY age DESC LIMIT 2"; + const result = await executeSELECTQuery(query); + // Expecting the two highest unique ages + expect(result).toEqual([{ age: "30" }, { age: "25" }]); }); -test('Execute SQL Query with LIKE Operator for Name', async () => { - const query = "SELECT name FROM student WHERE name LIKE '%Jane%'"; - const result = await executeSELECTQuery(query); - // Expecting names containing 'Jane' - expect(result).toEqual([{ name: 'Jane' }]); +test("Execute SQL Query with LIKE Operator for Name", async () => { + const query = "SELECT name FROM student WHERE name LIKE '%Jane%'"; + const result = await executeSELECTQuery(query); + // Expecting names containing 'Jane' + expect(result).toEqual([{ name: "Jane" }]); }); -test('Execute SQL Query with LIKE Operator and Wildcards', async () => { - const query = "SELECT name FROM student WHERE name LIKE 'J%'"; - const result = await executeSELECTQuery(query); - // Expecting names starting with 'J' - expect(result).toEqual([{ name: 'John' }, { name: 'Jane' }]); +test("Execute SQL Query with LIKE Operator and Wildcards", async () => { + const query = "SELECT name FROM student WHERE name LIKE 'J%'"; + const result = await executeSELECTQuery(query); + // Expecting names starting with 'J' + expect(result).toEqual([{ name: "John" }, { name: "Jane" }]); }); -test('Execute SQL Query with LIKE Operator Case Insensitive', async () => { - const query = "SELECT name FROM student WHERE name LIKE '%bob%'"; - const result = await executeSELECTQuery(query); - // Expecting names 'Bob' (case insensitive) - expect(result).toEqual([{ name: 'Bob' }]); +test("Execute SQL Query with LIKE Operator Case Insensitive", async () => { + const query = "SELECT name FROM student WHERE name LIKE '%bob%'"; + const result = await executeSELECTQuery(query); + // Expecting names 'Bob' (case insensitive) + expect(result).toEqual([{ name: "Bob" }]); }); -test('Execute SQL Query with LIKE Operator and DISTINCT', async () => { - const query = "SELECT DISTINCT name FROM student WHERE name LIKE '%e%'"; - const result = await executeSELECTQuery(query); - // Expecting unique names containing 'e' - expect(result).toEqual([{ name: 'Jane' }, { name: 'Alice' }]); +test("Execute SQL Query with LIKE Operator and DISTINCT", async () => { + const query = "SELECT DISTINCT name FROM student WHERE name LIKE '%e%'"; + const result = await executeSELECTQuery(query); + // Expecting unique names containing 'e' + expect(result).toEqual([{ name: "Jane" }, { name: "Alice" }]); }); -test('LIKE with ORDER BY and LIMIT', async () => { - const query = "SELECT name FROM student WHERE name LIKE '%a%' ORDER BY name ASC LIMIT 2"; - const result = await executeSELECTQuery(query); - // Expecting the first two names alphabetically that contain 'a' - expect(result).toEqual([{ name: 'Alice' }, { name: 'Jane' }]); -}); \ No newline at end of file +test("LIKE with ORDER BY and LIMIT", async () => { + const query = + "SELECT name FROM student WHERE name LIKE '%a%' ORDER BY name ASC LIMIT 2"; + const result = await executeSELECTQuery(query); + // Expecting the first two names alphabetically that contain 'a' + expect(result).toEqual([{ name: "Alice" }, { name: "Jane" }]); +}); diff --git a/tests/step-19/insertExecuter.test.js b/tests/step-19/insertExecuter.test.js index 8c405f727..473314045 100644 --- a/tests/step-19/insertExecuter.test.js +++ b/tests/step-19/insertExecuter.test.js @@ -1,33 +1,36 @@ -const { executeINSERTQuery } = require('../../src/index'); -const { readCSV, writeCSV } = require('../../src/csvReader'); -const fs = require('fs'); +const { executeINSERTQuery } = require("../../src/queryExecutor"); +const { readCSV, writeCSV } = require("../../src/csvReader"); +const fs = require("fs"); // Helper function to create grades.csv with initial data async function createGradesCSV() { - const initialData = [ - { student_id: '1', course: 'Mathematics', grade: 'A' }, - { student_id: '2', course: 'Chemistry', grade: 'B' }, - { student_id: '3', course: 'Mathematics', grade: 'C' } - ]; - await writeCSV('grades.csv', initialData); + const initialData = [ + { student_id: "1", course: "Mathematics", grade: "A" }, + { student_id: "2", course: "Chemistry", grade: "B" }, + { student_id: "3", course: "Mathematics", grade: "C" }, + ]; + await writeCSV("grades.csv", initialData); } // Test to INSERT a new grade and verify -test('Execute INSERT INTO Query for grades.csv', async () => { - // Create grades.csv with initial data - await createGradesCSV(); +test("Execute INSERT INTO Query for grades.csv", async () => { + // Create grades.csv with initial data + await createGradesCSV(); - // Execute INSERT statement - const insertQuery = "INSERT INTO grades (student_id, course, grade) VALUES ('4', 'Physics', 'A')"; - await executeINSERTQuery(insertQuery); + // Execute INSERT statement + const insertQuery = + "INSERT INTO grades (student_id, course, grade) VALUES ('4', 'Physics', 'A')"; + await executeINSERTQuery(insertQuery); - // Verify the new entry - const updatedData = await readCSV('grades.csv'); - const newEntry = updatedData.find(row => row.student_id === '4' && row.course === 'Physics'); - console.log(updatedData) - expect(newEntry).toBeDefined(); - expect(newEntry.grade).toEqual('A'); + // Verify the new entry + const updatedData = await readCSV("grades.csv"); + const newEntry = updatedData.find( + (row) => row.student_id === "4" && row.course === "Physics" + ); - // Cleanup: Delete grades.csv - fs.unlinkSync('grades.csv'); -}); \ No newline at end of file + expect(newEntry).toBeDefined(); + expect(newEntry.grade).toEqual("A"); + + // Cleanup: Delete grades.csv + fs.unlinkSync("grades.csv"); +});