Add new practice exercise: bottle-song

config.json

@@ -50,6 +50,14 @@
         "prerequisites": [],
         "difficulty": 1
       },
+      {
+        "slug": "bottle-song",
+        "name": "Bottle Song",
+        "uuid": "a3961350-2053-4e08-bf5d-fe9b43cb753c",
+        "practices": [],
+        "prerequisites": [],
+        "difficulty": 2
+      },
       {
         "slug": "darts",
         "name": "Darts",

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

@@ -0,0 +1,57 @@
+# Instructions
+
+Recite the lyrics to that popular children's repetitive song: Ten Green Bottles.
+
+Note that not all verses are identical.
+
+```text
+Ten green bottles hanging on the wall,
+Ten green bottles hanging on the wall,
+And if one green bottle should accidentally fall,
+There'll be nine green bottles hanging on the wall.
+
+Nine green bottles hanging on the wall,
+Nine green bottles hanging on the wall,
+And if one green bottle should accidentally fall,
+There'll be eight green bottles hanging on the wall.
+
+Eight green bottles hanging on the wall,
+Eight green bottles hanging on the wall,
+And if one green bottle should accidentally fall,
+There'll be seven green bottles hanging on the wall.
+
+Seven green bottles hanging on the wall,
+Seven green bottles hanging on the wall,
+And if one green bottle should accidentally fall,
+There'll be six green bottles hanging on the wall.
+
+Six green bottles hanging on the wall,
+Six green bottles hanging on the wall,
+And if one green bottle should accidentally fall,
+There'll be five green bottles hanging on the wall.
+
+Five green bottles hanging on the wall,
+Five green bottles hanging on the wall,
+And if one green bottle should accidentally fall,
+There'll be four green bottles hanging on the wall.
+
+Four green bottles hanging on the wall,
+Four green bottles hanging on the wall,
+And if one green bottle should accidentally fall,
+There'll be three green bottles hanging on the wall.
+
+Three green bottles hanging on the wall,
+Three green bottles hanging on the wall,
+And if one green bottle should accidentally fall,
+There'll be two green bottles hanging on the wall.
+
+Two green bottles hanging on the wall,
+Two green bottles hanging on the wall,
+And if one green bottle should accidentally fall,
+There'll be one green bottle hanging on the wall.
+
+One green bottle hanging on the wall,
+One green bottle hanging on the wall,
+And if one green bottle should accidentally fall,
+There'll be no green bottles hanging on the wall.
+```

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

@@ -0,0 +1,19 @@
+{
+  "authors": [
+    "jimmytty"
+  ],
+  "files": {
+    "solution": [
+      "bottle-song.sql"
+    ],
+    "test": [
+      "bottle-song_test.sql"
+    ],
+    "example": [
+      ".meta/example.sql"
+    ]
+  },
+  "blurb": "Produce the lyrics to the popular children's repetitive song: Ten Green Bottles.",
+  "source": "Wikipedia",
+  "source_url": "https://en.wikipedia.org/wiki/Ten_Green_Bottles"
+}

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

@@ -0,0 +1,52 @@
+DROP TABLE IF EXISTS pairs;
+CREATE TEMPORARY TABLE pairs (
+  n INTEGER NOT NULL,
+  a TEXT NOT NULL,
+  b TEXT NOT NULL
+);
+INSERT INTO pairs (n, a, b)
+VALUES
+(10, 'Ten'  , 'Nine' ),
+( 9, 'Nine' , 'Eight'),
+( 8, 'Eight', 'Seven'),
+( 7, 'Seven', 'Six'  ),
+( 6, 'Six'  , 'Five' ),
+( 5, 'Five' , 'Four' ),
+( 4, 'Four' , 'Three'),
+( 3, 'Three', 'Two'  ),
+( 2, 'Two'  , 'One'  ),
+( 1, 'One'  , 'no'   );
+
+DROP TABLE IF EXISTS verses;
+CREATE TABLE verses AS
+  SELECT n,
+         PRINTF('%s green bottles hanging on the wall,' || CHAR(10), a) ||
+         PRINTF('%s green bottles hanging on the wall,' || CHAR(10), a) ||
+         'And if one green bottle should accidentally fall,' || CHAR(10) ||
+         PRINTF(
+           'There''ll be %s green bottles hanging on the wall.',
+           LOWER(b)
+         ) AS verse
+  FROM pairs
+;
+
+UPDATE verses
+   SET verse = REPLACE(verse, 'be one green bottles', 'be one green bottle')
+ WHERE n = 2;
+UPDATE verses
+   SET verse = REPLACE(verse, 'One green bottles', 'One green bottle')
+ WHERE n = 1;
+
+
+UPDATE "bottle-song"
+   SET result = (
+     SELECT GROUP_CONCAT(verse, CHAR(10)||CHAR(10))
+       FROM (
+         SELECT verse
+           FROM verses
+          WHERE n <= start_bottles
+            AND n > start_bottles - take_down
+          ORDER BY n DESC
+       )
+   )
+;

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

@@ -0,0 +1,31 @@
+# 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.
+
+[d4ccf8fc-01dc-48c0-a201-4fbeb30f2d03]
+description = "verse -> single verse -> first generic verse"
+
+[0f0aded3-472a-4c64-b842-18d4f1f5f030]
+description = "verse -> single verse -> last generic verse"
+
+[f61f3c97-131f-459e-b40a-7428f3ed99d9]
+description = "verse -> single verse -> verse with 2 bottles"
+
+[05eadba9-5dbd-401e-a7e8-d17cc9baa8e0]
+description = "verse -> single verse -> verse with 1 bottle"
+
+[a4a28170-83d6-4dc1-bd8b-319b6abb6a80]
+description = "lyrics -> multiple verses -> first two verses"
+
+[3185d438-c5ac-4ce6-bcd3-02c9ff1ed8db]
+description = "lyrics -> multiple verses -> last three verses"
+
+[28c1584a-0e51-4b65-9ae2-fbc0bf4bbb28]
+description = "lyrics -> multiple verses -> all verses"

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

@@ -0,0 +1,7 @@
+-- Schema: CREATE TABLE "bottle-song" (
+--             start_bottles INTEGER NOT NULL,
+--             take_down     INTEGER NOT NULL,
+--             result        TEXT
+--         );
+-- Task: update bottle-song table and set the result based on the
+--       start_bottles and take_down.

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

@@ -0,0 +1,44 @@
+-- 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 ./bottle-song.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_bottles, take_down, result FROM "bottle-song") AS actual
+WHERE (actual.start_bottles, actual.take_down, actual.result) = (tests.start_bottles, tests.take_down, tests.expected);
+
+-- Update message for failed tests to give helpful information:
+UPDATE tests
+SET message = (
+    'Result for "'
+    || PRINTF(
+           'start_bottles=%d, take_down=%d',
+           tests.start_bottles,
+           tests.take_down
+       )
+    || '"'
+    || ' is <' || COALESCE(actual.result, 'NULL')
+    || '> but should be <' || tests.expected || '>'
+)
+FROM (SELECT start_bottles, take_down, result FROM "bottle-song") AS actual
+WHERE (actual.start_bottles, actual.take_down) = (tests.start_bottles, tests.take_down) 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;

exercises/practice/bottle-song/create_fixture.sql

@@ -0,0 +1,9 @@
+DROP TABLE IF EXISTS "bottle-song";
+CREATE TABLE "bottle-song" (
+    start_bottles INTEGER NOT NULL,
+    take_down     INTEGER NOT NULL,
+    result        TEXT
+);
+
+.mode csv
+.import ./data.csv "bottle-song"

exercises/practice/bottle-song/create_test_table.sql

@@ -0,0 +1,107 @@
+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_bottles INTEGER NOT NULL,
+    take_down     INTEGER NOT NULL,
+    expected      TEXT    NOT NULL
+);
+
+INSERT INTO tests (uuid, description, start_bottles, take_down, expected)
+VALUES
+        ('d4ccf8fc-01dc-48c0-a201-4fbeb30f2d03','first generic verse',10,1,'Ten green bottles hanging on the wall,
+Ten green bottles hanging on the wall,
+And if one green bottle should accidentally fall,
+There''ll be nine green bottles hanging on the wall.'),
+        ('0f0aded3-472a-4c64-b842-18d4f1f5f030','last generic verse',3,1,'Three green bottles hanging on the wall,
+Three green bottles hanging on the wall,
+And if one green bottle should accidentally fall,
+There''ll be two green bottles hanging on the wall.'),
+        ('f61f3c97-131f-459e-b40a-7428f3ed99d9','verse with 2 bottles',2,1,'Two green bottles hanging on the wall,
+Two green bottles hanging on the wall,
+And if one green bottle should accidentally fall,
+There''ll be one green bottle hanging on the wall.'),
+        ('05eadba9-5dbd-401e-a7e8-d17cc9baa8e0','verse with 1 bottle',1,1,'One green bottle hanging on the wall,
+One green bottle hanging on the wall,
+And if one green bottle should accidentally fall,
+There''ll be no green bottles hanging on the wall.'),
+        ('a4a28170-83d6-4dc1-bd8b-319b6abb6a80','first two verses',10,2,'Ten green bottles hanging on the wall,
+Ten green bottles hanging on the wall,
+And if one green bottle should accidentally fall,
+There''ll be nine green bottles hanging on the wall.
+
+Nine green bottles hanging on the wall,
+Nine green bottles hanging on the wall,
+And if one green bottle should accidentally fall,
+There''ll be eight green bottles hanging on the wall.'),
+        ('3185d438-c5ac-4ce6-bcd3-02c9ff1ed8db','last three verses',3,3,'Three green bottles hanging on the wall,
+Three green bottles hanging on the wall,
+And if one green bottle should accidentally fall,
+There''ll be two green bottles hanging on the wall.
+
+Two green bottles hanging on the wall,
+Two green bottles hanging on the wall,
+And if one green bottle should accidentally fall,
+There''ll be one green bottle hanging on the wall.
+
+One green bottle hanging on the wall,
+One green bottle hanging on the wall,
+And if one green bottle should accidentally fall,
+There''ll be no green bottles hanging on the wall.'),
+        ('28c1584a-0e51-4b65-9ae2-fbc0bf4bbb28','all verses',10,10,'Ten green bottles hanging on the wall,
+Ten green bottles hanging on the wall,
+And if one green bottle should accidentally fall,
+There''ll be nine green bottles hanging on the wall.
+
+Nine green bottles hanging on the wall,
+Nine green bottles hanging on the wall,
+And if one green bottle should accidentally fall,
+There''ll be eight green bottles hanging on the wall.
+
+Eight green bottles hanging on the wall,
+Eight green bottles hanging on the wall,
+And if one green bottle should accidentally fall,
+There''ll be seven green bottles hanging on the wall.
+
+Seven green bottles hanging on the wall,
+Seven green bottles hanging on the wall,
+And if one green bottle should accidentally fall,
+There''ll be six green bottles hanging on the wall.
+
+Six green bottles hanging on the wall,
+Six green bottles hanging on the wall,
+And if one green bottle should accidentally fall,
+There''ll be five green bottles hanging on the wall.
+
+Five green bottles hanging on the wall,
+Five green bottles hanging on the wall,
+And if one green bottle should accidentally fall,
+There''ll be four green bottles hanging on the wall.
+
+Four green bottles hanging on the wall,
+Four green bottles hanging on the wall,
+And if one green bottle should accidentally fall,
+There''ll be three green bottles hanging on the wall.
+
+Three green bottles hanging on the wall,
+Three green bottles hanging on the wall,
+And if one green bottle should accidentally fall,
+There''ll be two green bottles hanging on the wall.
+
+Two green bottles hanging on the wall,
+Two green bottles hanging on the wall,
+And if one green bottle should accidentally fall,
+There''ll be one green bottle hanging on the wall.
+
+One green bottle hanging on the wall,
+One green bottle hanging on the wall,
+And if one green bottle should accidentally fall,
+There''ll be no green bottles hanging on the wall.');

exercises/practice/bottle-song/data.csv

@@ -0,0 +1,7 @@
+10,1,""
+3,1,""
+2,1,""
+1,1,""
+10,2,""
+3,3,""
+10,10,""