Parallel Letter Frequency

sqlite/hello-world/.exercism/config.json

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+{
+  "authors": [
+    "vaeng"
+  ],
+  "files": {
+    "solution": [
+      "hello-world.sql"
+    ],
+    "test": [
+      "hello-world_test.sql"
+    ],
+    "example": [
+      ".meta/example.sql"
+    ]
+  },
+  "blurb": "Exercism's classic introductory exercise. Just say \"Hello, World!\".",
+  "source": "This is an exercise to introduce users to using Exercism",
+  "source_url": "https://en.wikipedia.org/wiki/%22Hello,_world!%22_program"
+}

sqlite/hello-world/HELP.md

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+# Help
+
+## Running the tests
+
+Navigate to the directory containing the appropriate `${slug}_test.sql` file, where `${slug}` is the name of the exercise, using hyphens instead of spaces and all lowercase (e.g. `hello-world_test.sql` for the `Hello World` exercise).
+
+```bash
+sqlite3 -bail < ${slug}_test.sql
+```
+
+You can use `SELECT` statements for debugging.
+The output will be forwarded to `user_output.md` and shown in the web-editor if tests fail.
+
+You can find more information in the [sqlite track docs about testing](https://exercism.org/docs/tracks/sqlite/tests).
+
+## Submitting your solution
+
+You can submit your solution using the `exercism submit hello-world.sql` command.
+This command will upload your solution to the Exercism website and print the solution page's URL.
+
+It's possible to submit an incomplete solution which allows you to:
+
+- See how others have completed the exercise
+- Request help from a mentor
+
+## Need to get help?
+
+If you'd like help solving the exercise, check the following pages:
+
+- The [SQLite track's documentation](https://exercism.org/docs/tracks/sqlite)
+- The [SQLite track's programming category on the forum](https://forum.exercism.org/c/programming/sqlite)
+- [Exercism's programming category on the forum](https://forum.exercism.org/c/programming/5)
+- The [Frequently Asked Questions](https://exercism.org/docs/using/faqs)
+
+Should those resources not suffice, you could submit your (incomplete) solution to request mentoring.
+
+If you're stuck on something, it may help to look at some of the [available resources](https://exercism.org/docs/tracks/sqlite/resources) or ask [The Exercism Community on Discord](https://exercism.org/r/discord).
+
+Additionally, [StackOverflow](http://stackoverflow.com/questions/tagged/sqlite) is a good spot to search for your problem/question to see if it has been answered already.
+If not, you can always [ask](https://stackoverflow.com/help/how-to-ask) or [answer](https://stackoverflow.com/help/how-to-answer) someone else's question.

sqlite/hello-world/README.md

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+# Hello World
+
+Welcome to Hello World on Exercism's SQLite Track.
+If you need help running the tests or submitting your code, check out `HELP.md`.
+
+## Instructions
+
+The classical introductory exercise.
+Just say "Hello, World!".
+
+["Hello, World!"][hello-world] is the traditional first program for beginning programming in a new language or environment.
+
+The objectives are simple:
+
+- Modify the provided code so that it produces the string "Hello, World!".
+- Run the test suite and make sure that it succeeds.
+- Submit your solution and check it at the website.
+
+If everything goes well, you will be ready to fetch your first real exercise.
+
+[hello-world]: https://en.wikipedia.org/wiki/%22Hello,_world!%22_program
+
+## Source
+
+### Created by
+
+- @vaeng
+
+### Based on
+
+This is an exercise to introduce users to using Exercism - https://en.wikipedia.org/wiki/%22Hello,_world!%22_program

sqlite/hello-world/create_fixture.sql

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+DROP TABLE IF EXISTS hello_world;
+
+CREATE TABLE hello_world (greeting TEXT);

sqlite/hello-world/hello-world.sql

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+INSERT INTO
+  hello_world (greeting)
+VALUES
+  ('Hello, World!');

sqlite/hello-world/hello-world_test.sql

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+-- Setup test table and read in student solution:
+.read ./test_setup.sql
+-- Test cases:
+INSERT INTO
+  tests (name, uuid, expected)
+VALUES
+  (
+    'Say Hi!',
+    'af9ffe10-dc13-42d8-a742-e7bdafac449d',
+    'Hello, World!'
+  );
+
+-- Comparison of user input and the tests updates the status for each test:
+UPDATE tests
+SET
+  status = 'pass'
+FROM
+  (
+    SELECT
+      greeting
+    FROM
+      hello_world
+  ) AS actual
+WHERE
+  actual.greeting = tests.expected;
+
+-- Write results and debug info:
+.read ./test_reporter.sql

sqlite/hello-world/test_reporter.sql

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+-- Upadate message for failed tests to give helpful information:
+UPDATE tests
+SET
+  message = (
+    'Greeting' || ' is "' || COALESCE(actual.greeting, 'NULL') || '" but should be "' || tests.expected || '"'
+  )
+FROM
+  (
+    SELECT
+      greeting
+    FROM
+      hello_world
+  ) AS actual
+WHERE
+  tests.status = 'fail';
+
+-- Save results to ./output.json (needed by the online test-runner)
+.mode json
+.once './output.json'
+SELECT
+  name,
+  status,
+  message,
+  output,
+  test_code,
+  task_id
+FROM
+  tests;
+
+-- Display test results in readable form for the student:
+.mode table
+SELECT
+  name,
+  status,
+  message
+FROM
+  tests;

sqlite/hello-world/test_setup.sql

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+-- 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 ./hello-world.sql
+.output
+-- Create a clean testing environment:
+DROP TABLE IF EXISTS main.tests;
+
+CREATE TABLE IF NOT EXISTS main.tests (
+  -- uuid and name (description) are taken from the test.toml file
+  uuid TEXT PRIMARY KEY,
+  name 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
+  expected TEXT NOT NULL
+);