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* add new practice exercise: bottle-song (#112)
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‎config.json

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"prerequisites": [],
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"difficulty": 1
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},
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{
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"slug": "bottle-song",
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"name": "Bottle Song",
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"uuid": "a3961350-2053-4e08-bf5d-fe9b43cb753c",
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"practices": [],
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"prerequisites": [],
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"difficulty": 2
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},
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{
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"slug": "darts",
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"name": "Darts",

‎exercises/practice/bottle-song/.docs/instructions.md

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# Instructions
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Recite the lyrics to that popular children's repetitive song: Ten Green Bottles.
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Note that not all verses are identical.
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```text
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Ten green bottles hanging on the wall,
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Ten green bottles hanging on the wall,
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And if one green bottle should accidentally fall,
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There'll be nine green bottles hanging on the wall.
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Nine green bottles hanging on the wall,
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Nine green bottles hanging on the wall,
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And if one green bottle should accidentally fall,
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There'll be eight green bottles hanging on the wall.
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Eight green bottles hanging on the wall,
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Eight green bottles hanging on the wall,
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And if one green bottle should accidentally fall,
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There'll be seven green bottles hanging on the wall.
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Seven green bottles hanging on the wall,
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Seven green bottles hanging on the wall,
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And if one green bottle should accidentally fall,
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There'll be six green bottles hanging on the wall.
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Six green bottles hanging on the wall,
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Six green bottles hanging on the wall,
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And if one green bottle should accidentally fall,
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There'll be five green bottles hanging on the wall.
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Five green bottles hanging on the wall,
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Five green bottles hanging on the wall,
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And if one green bottle should accidentally fall,
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There'll be four green bottles hanging on the wall.
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Four green bottles hanging on the wall,
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Four green bottles hanging on the wall,
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And if one green bottle should accidentally fall,
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There'll be three green bottles hanging on the wall.
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Three green bottles hanging on the wall,
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Three green bottles hanging on the wall,
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And if one green bottle should accidentally fall,
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There'll be two green bottles hanging on the wall.
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Two green bottles hanging on the wall,
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Two green bottles hanging on the wall,
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And if one green bottle should accidentally fall,
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There'll be one green bottle hanging on the wall.
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One green bottle hanging on the wall,
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One green bottle hanging on the wall,
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And if one green bottle should accidentally fall,
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There'll be no green bottles hanging on the wall.
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```

‎exercises/practice/bottle-song/.meta/config.json

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{
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"authors": [
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"jimmytty"
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],
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"files": {
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"solution": [
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"bottle-song.sql"
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],
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"test": [
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"bottle-song_test.sql"
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],
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"example": [
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".meta/example.sql"
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]
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},
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"blurb": "Produce the lyrics to the popular children's repetitive song: Ten Green Bottles.",
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"source": "Wikipedia",
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"source_url": "https://en.wikipedia.org/wiki/Ten_Green_Bottles"
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}

‎exercises/practice/bottle-song/.meta/example.sql

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DROP TABLE IF EXISTS pairs;
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CREATE TEMPORARY TABLE pairs (
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verse_number INTEGER NOT NULL,
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start_number TEXT NOT NULL,
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next_number TEXT NOT NULL
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);
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INSERT INTO pairs (verse_number, start_number, next_number)
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VALUES (10, 'Ten' , 'Nine' ),
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( 9, 'Nine' , 'Eight'),
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( 8, 'Eight', 'Seven'),
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( 7, 'Seven', 'Six' ),
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( 6, 'Six' , 'Five' ),
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( 5, 'Five' , 'Four' ),
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( 4, 'Four' , 'Three'),
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( 3, 'Three', 'Two' ),
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( 2, 'Two' , 'One' ),
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( 1, 'One' , 'no' );
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DROP TABLE IF EXISTS verses;
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CREATE TABLE verses AS
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SELECT verse_number,
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PRINTF('%s green bottles hanging on the wall,' || CHAR(10), start_number) ||
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PRINTF('%s green bottles hanging on the wall,' || CHAR(10), start_number) ||
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'And if one green bottle should accidentally fall,' || CHAR(10) ||
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PRINTF('There''ll be %s green bottles hanging on the wall.',LOWER(next_number)) AS verse
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FROM pairs
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;
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UPDATE verses
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SET verse = REPLACE(verse, 'be one green bottles', 'be one green bottle')
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WHERE verse_number = 2;
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UPDATE verses
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SET verse = REPLACE(verse, 'One green bottles', 'One green bottle')
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WHERE verse_number = 1;
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UPDATE "bottle-song"
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SET result = (
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SELECT GROUP_CONCAT(verse, CHAR(10)||CHAR(10))
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FROM (
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SELECT verse
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FROM verses
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WHERE verse_number <= start_bottles
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AND verse_number > start_bottles - take_down
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ORDER BY verse_number DESC
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)
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)
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;

‎exercises/practice/bottle-song/.meta/tests.toml

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# This is an auto-generated file.
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#
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# Regenerating this file via `configlet sync` will:
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# - Recreate every `description` key/value pair
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# - Recreate every `reimplements` key/value pair, where they exist in problem-specifications
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# - Remove any `include = true` key/value pair (an omitted `include` key implies inclusion)
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# - Preserve any other key/value pair
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#
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# As user-added comments (using the # character) will be removed when this file
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# is regenerated, comments can be added via a `comment` key.
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[d4ccf8fc-01dc-48c0-a201-4fbeb30f2d03]
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description = "verse -> single verse -> first generic verse"
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[0f0aded3-472a-4c64-b842-18d4f1f5f030]
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description = "verse -> single verse -> last generic verse"
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[f61f3c97-131f-459e-b40a-7428f3ed99d9]
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description = "verse -> single verse -> verse with 2 bottles"
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[05eadba9-5dbd-401e-a7e8-d17cc9baa8e0]
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description = "verse -> single verse -> verse with 1 bottle"
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[a4a28170-83d6-4dc1-bd8b-319b6abb6a80]
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description = "lyrics -> multiple verses -> first two verses"
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[3185d438-c5ac-4ce6-bcd3-02c9ff1ed8db]
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description = "lyrics -> multiple verses -> last three verses"
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[28c1584a-0e51-4b65-9ae2-fbc0bf4bbb28]
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description = "lyrics -> multiple verses -> all verses"

‎exercises/practice/bottle-song/bottle-song.sql

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-- Schema:
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-- CREATE TABLE "bottle-song" (
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-- start_bottles INTEGER NOT NULL,
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-- take_down INTEGER NOT NULL,
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-- result TEXT
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-- );
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-- Task: update bottle-song table and set the result based on the
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-- start_bottles and take_down.

‎exercises/practice/bottle-song/bottle-song_test.sql

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-- Create database:
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.read ./create_fixture.sql
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-- Read user student solution and save any output as markdown in user_output.md:
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.mode markdown
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.output user_output.md
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.read ./bottle-song.sql
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.output
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-- Create a clean testing environment:
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.read ./create_test_table.sql
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-- Comparison of user input and the tests updates the status for each test:
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UPDATE tests
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SET status = 'pass'
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FROM (SELECT start_bottles, take_down, result FROM "bottle-song") AS actual
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WHERE (actual.start_bottles, actual.take_down, actual.result) = (tests.start_bottles, tests.take_down, tests.expected);
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-- Update message for failed tests to give helpful information:
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UPDATE tests
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SET message = (
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'Result for "'
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|| PRINTF('start_bottles=%d, take_down=%d', tests.start_bottles,tests.take_down)
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|| '"'
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|| ' is <' || COALESCE(actual.result, 'NULL')
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|| '> but should be <' || tests.expected || '>'
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)
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FROM (SELECT start_bottles, take_down, result FROM "bottle-song") AS actual
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WHERE (actual.start_bottles, actual.take_down) = (tests.start_bottles, tests.take_down) AND tests.status = 'fail';
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-- Save results to ./output.json (needed by the online test-runner)
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.mode json
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.once './output.json'
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SELECT description, status, message, output, test_code, task_id
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FROM tests;
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-- Display test results in readable form for the student:
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.mode table
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SELECT description, status, message
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FROM tests;

‎exercises/practice/bottle-song/create_fixture.sql

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DROP TABLE IF EXISTS "bottle-song";
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CREATE TABLE "bottle-song" (
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start_bottles INTEGER NOT NULL,
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take_down INTEGER NOT NULL,
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result TEXT
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);
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.mode csv
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.import ./data.csv "bottle-song"

‎exercises/practice/bottle-song/create_test_table.sql

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DROP TABLE IF EXISTS tests;
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CREATE TABLE IF NOT EXISTS tests (
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-- uuid and description are taken from the test.toml file
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uuid TEXT PRIMARY KEY,
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description TEXT NOT NULL,
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-- The following section is needed by the online test-runner
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status TEXT DEFAULT 'fail',
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message TEXT,
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output TEXT,
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test_code TEXT,
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task_id INTEGER DEFAULT NULL,
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-- Here are columns for the actual tests
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start_bottles INTEGER NOT NULL,
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take_down INTEGER NOT NULL,
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expected TEXT NOT NULL
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);
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INSERT INTO tests (uuid, description, start_bottles, take_down, expected)
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VALUES
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('d4ccf8fc-01dc-48c0-a201-4fbeb30f2d03','first generic verse',10,1,'Ten green bottles hanging on the wall,
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Ten green bottles hanging on the wall,
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And if one green bottle should accidentally fall,
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There''ll be nine green bottles hanging on the wall.'),
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('0f0aded3-472a-4c64-b842-18d4f1f5f030','last generic verse',3,1,'Three green bottles hanging on the wall,
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Three green bottles hanging on the wall,
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And if one green bottle should accidentally fall,
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There''ll be two green bottles hanging on the wall.'),
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('f61f3c97-131f-459e-b40a-7428f3ed99d9','verse with 2 bottles',2,1,'Two green bottles hanging on the wall,
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Two green bottles hanging on the wall,
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And if one green bottle should accidentally fall,
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There''ll be one green bottle hanging on the wall.'),
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('05eadba9-5dbd-401e-a7e8-d17cc9baa8e0','verse with 1 bottle',1,1,'One green bottle hanging on the wall,
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One green bottle hanging on the wall,
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And if one green bottle should accidentally fall,
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There''ll be no green bottles hanging on the wall.'),
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('a4a28170-83d6-4dc1-bd8b-319b6abb6a80','first two verses',10,2,'Ten green bottles hanging on the wall,
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Ten green bottles hanging on the wall,
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And if one green bottle should accidentally fall,
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There''ll be nine green bottles hanging on the wall.
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Nine green bottles hanging on the wall,
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Nine green bottles hanging on the wall,
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And if one green bottle should accidentally fall,
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There''ll be eight green bottles hanging on the wall.'),
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('3185d438-c5ac-4ce6-bcd3-02c9ff1ed8db','last three verses',3,3,'Three green bottles hanging on the wall,
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Three green bottles hanging on the wall,
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And if one green bottle should accidentally fall,
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There''ll be two green bottles hanging on the wall.
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Two green bottles hanging on the wall,
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Two green bottles hanging on the wall,
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And if one green bottle should accidentally fall,
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There''ll be one green bottle hanging on the wall.
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One green bottle hanging on the wall,
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One green bottle hanging on the wall,
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And if one green bottle should accidentally fall,
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There''ll be no green bottles hanging on the wall.'),
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('28c1584a-0e51-4b65-9ae2-fbc0bf4bbb28','all verses',10,10,'Ten green bottles hanging on the wall,
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Ten green bottles hanging on the wall,
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And if one green bottle should accidentally fall,
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There''ll be nine green bottles hanging on the wall.
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Nine green bottles hanging on the wall,
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Nine green bottles hanging on the wall,
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And if one green bottle should accidentally fall,
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There''ll be eight green bottles hanging on the wall.
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Eight green bottles hanging on the wall,
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Eight green bottles hanging on the wall,
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And if one green bottle should accidentally fall,
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There''ll be seven green bottles hanging on the wall.
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Seven green bottles hanging on the wall,
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Seven green bottles hanging on the wall,
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And if one green bottle should accidentally fall,
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There''ll be six green bottles hanging on the wall.
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Six green bottles hanging on the wall,
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Six green bottles hanging on the wall,
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And if one green bottle should accidentally fall,
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There''ll be five green bottles hanging on the wall.
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Five green bottles hanging on the wall,
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Five green bottles hanging on the wall,
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And if one green bottle should accidentally fall,
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There''ll be four green bottles hanging on the wall.
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Four green bottles hanging on the wall,
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Four green bottles hanging on the wall,
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And if one green bottle should accidentally fall,
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There''ll be three green bottles hanging on the wall.
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Three green bottles hanging on the wall,
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Three green bottles hanging on the wall,
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And if one green bottle should accidentally fall,
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There''ll be two green bottles hanging on the wall.
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Two green bottles hanging on the wall,
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Two green bottles hanging on the wall,
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And if one green bottle should accidentally fall,
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There''ll be one green bottle hanging on the wall.
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One green bottle hanging on the wall,
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One green bottle hanging on the wall,
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And if one green bottle should accidentally fall,
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There''ll be no green bottles hanging on the wall.');

‎exercises/practice/bottle-song/data.csv

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10,1,""
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3,1,""
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2,1,""
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1,1,""
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10,2,""
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3,3,""
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10,10,""

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