Hussam-W1-database

Week1/databases/meetup/index.js

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+const { Client } = require('pg');
+async function main(){
+const client = new Client({
+  user: 'hyfuser', 
+  host: 'localhost', 
+  database: 'meetup',
+  password: 'hyfpassword',
+  port: 5432, 
+});
+try{
+    await client.connect();
+    console.log("Connected successfully to the database");
+    const createInviteeTableQuery=`CREATE TABLE IF NOT EXISTS invitee(
+    invitee_no SERIAL PRIMARY KEY,
+    invitee_name VARCHAR(255) NOT NULL,
+    invitee_by VARCHAR(255) NOT NULL);`;
+
+    const creatRoomTableQuery=`CREATE TABLE IF NOT EXISTS room(
+    room_no SERIAL PRIMARY KEY,
+    room_name VARCHAR(255) NOT NULL,
+    floor_number SMALLINT NOT NULL);`;
+
+    const creatMeetingTableQuery=`CREATE TABLE IF NOT EXISTS meeting(
+    meeting_no SERIAL PRIMARY KEY,
+    meeting_title VARCHAR(255) NOT NULL,
+    start_time TIMESTAMP NOT NULL,
+    end_time TIMESTAMP NOT NULL,
+    room_no INT NOT NULL REFERENCES room(room_no));`;
+
+   await client.query(createInviteeTableQuery);
+    await client.query(creatRoomTableQuery);
+     await client.query(creatMeetingTableQuery);
+    console.log("Tables created successfully");
+
+    const insertInviteeQuery = `
+      INSERT INTO Invitee (invitee_name,INVITEE_BY ) VALUES
+      ('Alice', 'John'),
+      ('Bob', 'Jane'),
+      ('Charlie', 'John'),
+      ('David', 'Alice'),
+      ('Eve', 'Bob');
+    `;
+    const insertRoomQuery = `
+      INSERT INTO room (room_name, floor_number) VALUES
+      ('Boardroom A', 1),
+      ('Conference Room 201', 2),
+      ('Boardroom B', 1),
+      ('Huddle Room 301', 3),
+      ('Main Hall', 1);
+    `;
+    const insertMeetingsQuery = `
+        INSERT INTO Meeting (meeting_title, start_time, end_time, room_no) VALUES
+        ('Project Kickoff', '2025-08-25 09:00:00', '2025-08-25 10:30:00', 1),
+        ('Marketing Strategy', '2025-08-26 11:00:00', '2025-08-26 12:00:00', 3),
+        ('Quarterly Review', '2025-08-27 14:00:00', '2025-08-27 15:00:00', 5),
+        ('Team Sync', '2025-08-28 10:00:00', '2025-08-28 10:30:00', 2),
+        ('Client Demo', '2025-08-29 16:00:00', '2025-08-29 17:00:00', 4);
+        `;
+    await client.query(insertInviteeQuery);
+    await client.query(insertRoomQuery);
+    await client.query(insertMeetingsQuery);
+    console.log("Sample data inserted successfully");
+
+
+}catch(err){
+    console.error("Error during database operation:", err);
+}
+finally{
+    await client.end();
+    console.log("Database connection closed")
+}
+}
+main();

Week1/databases/meetup/world.js

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+const { Client } = require('pg');
+
+async function main() {
+    const client = new Client({
+        user: 'hyfuser',
+        host: 'localhost',
+        database: 'world',
+        password: 'hyfpassword',
+        port: 5432, 
+    });
+
+    try {
+        await client.connect();
+        console.log("Connected successfully to the database");
+
+
+        const selectNamesOfCountryQuery = `SELECT name FROM country WHERE population > 8000000;`;
+        const res = await client.query(selectNamesOfCountryQuery); 
+        console.log(res.rows);
+
+
+        const selectNamesOfCountry = `SELECT name FROM country WHERE name LIKE '%land%';`;
+        const res1 = await client.query(selectNamesOfCountry);
+        console.log(res1.rows);
+
+
+        const selectNamesOfCity = `SELECT name FROM city WHERE population BETWEEN 500000 AND 1000000;`;
+        const res2 = await client.query(selectNamesOfCity);
+        console.log(res2.rows);
+
+
+        const selectCountriesOfContinent = `SELECT name FROM country WHERE continent='Europe';`;
+        const res3 = await client.query(selectCountriesOfContinent);
+        console.log(res3.rows);
+
+
+        const selectCountriesOrderBySurfaceArea = `SELECT * FROM country ORDER BY surfacearea DESC;`;
+        const res4 = await client.query(selectCountriesOrderBySurfaceArea);
+        console.log(res4.rows);
+
+
+        const selectCitiesNamesOfCountry = `SELECT name FROM city WHERE countrycode='NLD';`;
+        const res5 = await client.query(selectCitiesNamesOfCountry);
+        console.log(res5.rows);
+
+
+        const selectPopulationOfCity = `SELECT population FROM city WHERE name='Rotterdam';`;
+        const res6 = await client.query(selectPopulationOfCity);
+        console.log(res6.rows);
+
+
+        const selectTopCountriesBySurfaceArea = `SELECT name, surfacearea FROM country ORDER BY surfacearea DESC LIMIT 10;`;
+        const res7 = await client.query(selectTopCountriesBySurfaceArea);
+        console.log(res7.rows);
+
+
+        const selectTopPopulatedCities = `SELECT name, population FROM city ORDER BY population DESC LIMIT 10;`;
+        const res8 = await client.query(selectTopPopulatedCities);
+        console.log(res8.rows);
+
+
+        const selectPopulationOfWorld = `SELECT SUM(population) AS total_population FROM country;`;
+        const res9 = await client.query(selectPopulationOfWorld);
+        console.log(res9.rows);
+
+    } catch (err) {
+        console.error('Error executing query', err.stack);
+    } finally {
+        await client.end();
+    }
+}
+
+main();