Add new practice exercise: twelve-days

config.json

@@ -234,6 +234,14 @@
         "prerequisites": [],
         "difficulty": 5
       },
+      {
+        "slug": "twelve-days",
+        "name": "Twelve Days",
+        "uuid": "ff75a702-38b8-4d86-a384-ce019c067589",
+        "practices": [],
+        "prerequisites": [],
+        "difficulty": 5
+      },
       {
         "slug": "acronym",
         "name": "Acronym",

exercises/practice/twelve-days/.docs/instructions.md

@@ -0,0 +1,36 @@
+# Instructions
+
+Your task in this exercise is to write code that returns the lyrics of the song: "The Twelve Days of Christmas."
+
+"The Twelve Days of Christmas" is a common English Christmas carol.
+Each subsequent verse of the song builds on the previous verse.
+
+The lyrics your code returns should _exactly_ match the full song text shown below.
+
+## Lyrics
+
+```text
+On the first day of Christmas my true love gave to me: a Partridge in a Pear Tree.
+
+On the second day of Christmas my true love gave to me: two Turtle Doves, and a Partridge in a Pear Tree.
+
+On the third day of Christmas my true love gave to me: three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.
+
+On the fourth day of Christmas my true love gave to me: four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.
+
+On the fifth day of Christmas my true love gave to me: five Gold Rings, four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.
+
+On the sixth day of Christmas my true love gave to me: six Geese-a-Laying, five Gold Rings, four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.
+
+On the seventh day of Christmas my true love gave to me: seven Swans-a-Swimming, six Geese-a-Laying, five Gold Rings, four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.
+
+On the eighth day of Christmas my true love gave to me: eight Maids-a-Milking, seven Swans-a-Swimming, six Geese-a-Laying, five Gold Rings, four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.
+
+On the ninth day of Christmas my true love gave to me: nine Ladies Dancing, eight Maids-a-Milking, seven Swans-a-Swimming, six Geese-a-Laying, five Gold Rings, four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.
+
+On the tenth day of Christmas my true love gave to me: ten Lords-a-Leaping, nine Ladies Dancing, eight Maids-a-Milking, seven Swans-a-Swimming, six Geese-a-Laying, five Gold Rings, four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.
+
+On the eleventh day of Christmas my true love gave to me: eleven Pipers Piping, ten Lords-a-Leaping, nine Ladies Dancing, eight Maids-a-Milking, seven Swans-a-Swimming, six Geese-a-Laying, five Gold Rings, four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.
+
+On the twelfth day of Christmas my true love gave to me: twelve Drummers Drumming, eleven Pipers Piping, ten Lords-a-Leaping, nine Ladies Dancing, eight Maids-a-Milking, seven Swans-a-Swimming, six Geese-a-Laying, five Gold Rings, four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.
+```

exercises/practice/twelve-days/.meta/config.json

@@ -0,0 +1,19 @@
+{
+  "authors": [
+    "jimmytty"
+  ],
+  "files": {
+    "solution": [
+      "twelve-days.sql"
+    ],
+    "test": [
+      "twelve-days_test.sql"
+    ],
+    "example": [
+      ".meta/example.sql"
+    ]
+  },
+  "blurb": "Output the lyrics to 'The Twelve Days of Christmas'.",
+  "source": "Wikipedia",
+  "source_url": "https://en.wikipedia.org/wiki/The_Twelve_Days_of_Christmas_(song)"
+}

exercises/practice/twelve-days/.meta/example.sql

@@ -0,0 +1,52 @@
+DROP TABLE IF EXISTS inputs;
+CREATE TEMPORARY TABLE inputs (
+    idx     INTEGER NOT NULL,
+    ordinal TEXT    NOT NULL,
+    item    TEXT    NOT NULL
+);
+INSERT INTO inputs (idx, ordinal, item)
+VALUES
+( 1, 'first',    'a Partridge in a Pear Tree'),
+( 2, 'second',   'two Turtle Doves'          ),
+( 3, 'third',    'three French Hens'         ),
+( 4, 'fourth',   'four Calling Birds'        ),
+( 5, 'fifth',    'five Gold Rings'           ),
+( 6, 'sixth',    'six Geese-a-Laying'        ),
+( 7, 'seventh',  'seven Swans-a-Swimming'    ),
+( 8, 'eighth',   'eight Maids-a-Milking'     ),
+( 9, 'ninth',    'nine Ladies Dancing'       ),
+(10, 'tenth',    'ten Lords-a-Leaping'       ),
+(11, 'eleventh', 'eleven Pipers Piping'      ),
+(12, 'twelfth',  'twelve Drummers Drumming'  );
+
+DROP TABLE IF EXISTS verses;
+CREATE TEMPORARY TABLE verses AS
+  SELECT idx,
+         PRINTF(
+           'On the %s day of Christmas my true love gave to me: %s.',
+           ordinal,
+           items
+         ) AS verse
+  FROM (
+    SELECT
+      idx, ordinal,
+      GROUP_CONCAT(item, IIF(idx = 1, ', and ', ', '))
+        OVER(
+          ORDER BY idx DESC ROWS BETWEEN 0 PRECEDING AND 12 FOLLOWING
+        ) items
+      FROM inputs
+     ORDER BY idx
+  )
+;
+
+UPDATE "twelve-days"
+   SET result = (
+     SELECT GROUP_CONCAT(verse, CHAR(10))
+       FROM (
+         SELECT verse
+           FROM verses
+          WHERE idx BETWEEN start_verse AND end_verse
+          ORDER BY idx
+       )
+   )
+;

exercises/practice/twelve-days/.meta/tests.toml

@@ -0,0 +1,55 @@
+# This is an auto-generated file.
+#
+# Regenerating this file via `configlet sync` will:
+# - Recreate every `description` key/value pair
+# - Recreate every `reimplements` key/value pair, where they exist in problem-specifications
+# - Remove any `include = true` key/value pair (an omitted `include` key implies inclusion)
+# - Preserve any other key/value pair
+#
+# As user-added comments (using the # character) will be removed when this file
+# is regenerated, comments can be added via a `comment` key.
+
+[c0b5a5e6-c89d-49b1-a6b2-9f523bff33f7]
+description = "verse -> first day a partridge in a pear tree"
+
+[1c64508a-df3d-420a-b8e1-fe408847854a]
+description = "verse -> second day two turtle doves"
+
+[a919e09c-75b2-4e64-bb23-de4a692060a8]
+description = "verse -> third day three french hens"
+
+[9bed8631-ec60-4894-a3bb-4f0ec9fbe68d]
+description = "verse -> fourth day four calling birds"
+
+[cf1024f0-73b6-4545-be57-e9cea565289a]
+description = "verse -> fifth day five gold rings"
+
+[50bd3393-868a-4f24-a618-68df3d02ff04]
+description = "verse -> sixth day six geese-a-laying"
+
+[8f29638c-9bf1-4680-94be-e8b84e4ade83]
+description = "verse -> seventh day seven swans-a-swimming"
+
+[7038d6e1-e377-47ad-8c37-10670a05bc05]
+description = "verse -> eighth day eight maids-a-milking"
+
+[37a800a6-7a56-4352-8d72-0f51eb37cfe8]
+description = "verse -> ninth day nine ladies dancing"
+
+[10b158aa-49ff-4b2d-afc3-13af9133510d]
+description = "verse -> tenth day ten lords-a-leaping"
+
+[08d7d453-f2ba-478d-8df0-d39ea6a4f457]
+description = "verse -> eleventh day eleven pipers piping"
+
+[0620fea7-1704-4e48-b557-c05bf43967f0]
+description = "verse -> twelfth day twelve drummers drumming"
+
+[da8b9013-b1e8-49df-b6ef-ddec0219e398]
+description = "lyrics -> recites first three verses of the song"
+
+[c095af0d-3137-4653-ad32-bfb899eda24c]
+description = "lyrics -> recites three verses from the middle of the song"
+
+[20921bc9-cc52-4627-80b3-198cbbfcf9b7]
+description = "lyrics -> recites the whole song"

exercises/practice/twelve-days/create_fixture.sql

@@ -0,0 +1,9 @@
+DROP TABLE IF EXISTS "twelve-days";
+CREATE TABLE "twelve-days" (
+    start_verse INTEGER NOT NULL,
+    end_verse   INTEGER NOT NULL,
+    result      TEXT
+);
+
+.mode csv
+.import ./data.csv "twelve-days"

exercises/practice/twelve-days/create_test_table.sql

@@ -0,0 +1,36 @@
+DROP TABLE IF EXISTS tests;
+CREATE TABLE IF NOT EXISTS tests (
+    -- uuid and description are taken from the test.toml file
+    uuid TEXT PRIMARY KEY,
+    description TEXT NOT NULL,
+    -- The following section is needed by the online test-runner
+    status TEXT DEFAULT 'fail',
+    message TEXT,
+    output TEXT,
+    test_code TEXT,
+    task_id INTEGER DEFAULT NULL,
+    -- Here are columns for the actual tests
+    start_verse INTEGER NOT NULL,
+    end_verse INTEGER NOT NULL,
+    expected TEXT NOT NULL
+);
+
+INSERT INTO tests (uuid, description, start_verse, end_verse, expected)
+    VALUES
+        ('c0b5a5e6-c89d-49b1-a6b2-9f523bff33f7', 'first day a partridge in a pear tree', 1, 1, 'On the first day of Christmas my true love gave to me: a Partridge in a Pear Tree.'),
+        ('1c64508a-df3d-420a-b8e1-fe408847854a', 'second day two turtle doves', 2, 2, 'On the second day of Christmas my true love gave to me: two Turtle Doves, and a Partridge in a Pear Tree.'),
+        ('a919e09c-75b2-4e64-bb23-de4a692060a8', 'third day three french hens', 3, 3, 'On the third day of Christmas my true love gave to me: three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.'),
+        ('9bed8631-ec60-4894-a3bb-4f0ec9fbe68d', 'fourth day four calling birds', 4, 4, 'On the fourth day of Christmas my true love gave to me: four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.'),
+        ('cf1024f0-73b6-4545-be57-e9cea565289a', 'fifth day five gold rings', 5, 5, 'On the fifth day of Christmas my true love gave to me: five Gold Rings, four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.'),
+        ('50bd3393-868a-4f24-a618-68df3d02ff04', 'sixth day six geese-a-laying', 6, 6, 'On the sixth day of Christmas my true love gave to me: six Geese-a-Laying, five Gold Rings, four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.'),
+        ('8f29638c-9bf1-4680-94be-e8b84e4ade83', 'seventh day seven swans-a-swimming', 7, 7, 'On the seventh day of Christmas my true love gave to me: seven Swans-a-Swimming, six Geese-a-Laying, five Gold Rings, four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.'),
+        ('7038d6e1-e377-47ad-8c37-10670a05bc05', 'eighth day eight maids-a-milking', 8, 8, 'On the eighth day of Christmas my true love gave to me: eight Maids-a-Milking, seven Swans-a-Swimming, six Geese-a-Laying, five Gold Rings, four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.'),
+        ('37a800a6-7a56-4352-8d72-0f51eb37cfe8', 'ninth day nine ladies dancing', 9, 9, 'On the ninth day of Christmas my true love gave to me: nine Ladies Dancing, eight Maids-a-Milking, seven Swans-a-Swimming, six Geese-a-Laying, five Gold Rings, four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.'),
+        ('10b158aa-49ff-4b2d-afc3-13af9133510d', 'tenth day ten lords-a-leaping', 10, 10, 'On the tenth day of Christmas my true love gave to me: ten Lords-a-Leaping, nine Ladies Dancing, eight Maids-a-Milking, seven Swans-a-Swimming, six Geese-a-Laying, five Gold Rings, four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.'),
+        ('08d7d453-f2ba-478d-8df0-d39ea6a4f457', 'eleventh day eleven pipers piping', 11, 11, 'On the eleventh day of Christmas my true love gave to me: eleven Pipers Piping, ten Lords-a-Leaping, nine Ladies Dancing, eight Maids-a-Milking, seven Swans-a-Swimming, six Geese-a-Laying, five Gold Rings, four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.'),
+        ('0620fea7-1704-4e48-b557-c05bf43967f0', 'twelfth day twelve drummers drumming', 12, 12, 'On the twelfth day of Christmas my true love gave to me: twelve Drummers Drumming, eleven Pipers Piping, ten Lords-a-Leaping, nine Ladies Dancing, eight Maids-a-Milking, seven Swans-a-Swimming, six Geese-a-Laying, five Gold Rings, four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.'),
+        ('da8b9013-b1e8-49df-b6ef-ddec0219e398', 'recites first three verses of the song', 1, 3, 'On the first day of Christmas my true love gave to me: a Partridge in a Pear Tree.\nOn the second day of Christmas my true love gave to me: two Turtle Doves, and a Partridge in a Pear Tree.\nOn the third day of Christmas my true love gave to me: three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.'),
+        ('c095af0d-3137-4653-ad32-bfb899eda24c', 'recites three verses from the middle of the song', 4, 6, 'On the fourth day of Christmas my true love gave to me: four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.\nOn the fifth day of Christmas my true love gave to me: five Gold Rings, four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.\nOn the sixth day of Christmas my true love gave to me: six Geese-a-Laying, five Gold Rings, four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.'),
+        ('20921bc9-cc52-4627-80b3-198cbbfcf9b7', 'recites the whole song', 1, 12, 'On the first day of Christmas my true love gave to me: a Partridge in a Pear Tree.\nOn the second day of Christmas my true love gave to me: two Turtle Doves, and a Partridge in a Pear Tree.\nOn the third day of Christmas my true love gave to me: three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.\nOn the fourth day of Christmas my true love gave to me: four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.\nOn the fifth day of Christmas my true love gave to me: five Gold Rings, four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.\nOn the sixth day of Christmas my true love gave to me: six Geese-a-Laying, five Gold Rings, four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.\nOn the seventh day of Christmas my true love gave to me: seven Swans-a-Swimming, six Geese-a-Laying, five Gold Rings, four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.\nOn the eighth day of Christmas my true love gave to me: eight Maids-a-Milking, seven Swans-a-Swimming, six Geese-a-Laying, five Gold Rings, four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.\nOn the ninth day of Christmas my true love gave to me: nine Ladies Dancing, eight Maids-a-Milking, seven Swans-a-Swimming, six Geese-a-Laying, five Gold Rings, four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.\nOn the tenth day of Christmas my true love gave to me: ten Lords-a-Leaping, nine Ladies Dancing, eight Maids-a-Milking, seven Swans-a-Swimming, six Geese-a-Laying, five Gold Rings, four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.\nOn the eleventh day of Christmas my true love gave to me: eleven Pipers Piping, ten Lords-a-Leaping, nine Ladies Dancing, eight Maids-a-Milking, seven Swans-a-Swimming, six Geese-a-Laying, five Gold Rings, four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.\nOn the twelfth day of Christmas my true love gave to me: twelve Drummers Drumming, eleven Pipers Piping, ten Lords-a-Leaping, nine Ladies Dancing, eight Maids-a-Milking, seven Swans-a-Swimming, six Geese-a-Laying, five Gold Rings, four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.');
+
+UPDATE tests SET expected = REPLACE(expected, '\n', CHAR(10));

exercises/practice/twelve-days/data.csv

@@ -0,0 +1,15 @@
+1,1,
+2,2,
+3,3,
+4,4,
+5,5,
+6,6,
+7,7,
+8,8,
+9,9,
+10,10,
+11,11,
+12,12,
+1,3,
+4,6,
+1,12,

exercises/practice/twelve-days/twelve-days.sql

@@ -0,0 +1,8 @@
+-- Schema:
+-- CREATE TABLE "twelve-days" (
+--     start_verse INTEGER NOT NULL,
+--     end_verse   INTEGER NOT NULL,
+--     result      TEXT
+-- );
+--
+-- Task: update the twelve-days table and set result bases on the start_verse and end_verse.

exercises/practice/twelve-days/twelve-days_test.sql

@@ -0,0 +1,40 @@
+-- Create database:
+.read ./create_fixture.sql
+
+-- Read user student solution and save any output as markdown in user_output.md:
+.mode markdown
+.output user_output.md
+.read ./twelve-days.sql
+.output
+
+-- Create a clean testing environment:
+.read ./create_test_table.sql
+
+-- Comparison of user input and the tests updates the status for each test:
+UPDATE tests
+SET status = 'pass'
+FROM (SELECT start_verse, end_verse, result FROM "twelve-days") AS actual
+WHERE (actual.start_verse, actual.end_verse, actual.result) = (tests.start_verse, tests.end_verse, tests.expected);
+
+-- Update message for failed tests to give helpful information:
+UPDATE tests
+SET message = (
+    'Result for "'
+    || PRINTF('start_verse: %d, end_verse: %d', tests.start_verse, tests.end_verse)
+    || '"'
+    || ' is <' || COALESCE(actual.result, 'NULL')
+    || '> but should be <' || tests.expected || '>'
+)
+FROM (SELECT start_verse, end_verse, result FROM "twelve-days") AS actual
+WHERE (actual.start_verse, actual.end_verse) = (tests.start_verse, tests.end_verse) AND tests.status = 'fail';
+
+-- Save results to ./output.json (needed by the online test-runner)
+.mode json
+.once './output.json'
+SELECT description, status, message, output, test_code, task_id
+FROM tests;
+
+-- Display test results in readable form for the student:
+.mode table
+SELECT description, status, message
+FROM tests;