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The sqlite db file is there, and if you are having problems with it loading, then use the sql script to create the database.", + "main": "index.js", + "scripts": { + "test": "echo \"Error: no test specified\" && exit 1" + }, + "keywords": [], + "author": "", + "license": "ISC", + "type": "module", + "dependencies": { + "better-sqlite3": "^12.8.0" + } +} diff --git a/task-1/queries.sql b/task-1/queries.sql index fecf7ad..784b5b4 100644 --- a/task-1/queries.sql +++ b/task-1/queries.sql @@ -1,27 +1,68 @@ ---- Queries -- **Question 1** — List the title and published year of every book in the `'Science Fiction'` genre, ordered by published year (oldest first). +SELECT title, published_year +FROM books +WHERE genre = 'Science Fiction' +ORDER BY published_year ASC; -- **Question 2** — Show every book published before 1950. Display the title and year only. +SELECT title, published_year +FROM books +WHERE published_year < 1950; +ORDER BY published_year ASC; -- **Question 3** — Show every book in the database along with its author's full name. Combine `first_name` and `last_name` into a single column called `author`. _(Hint: you will need a JOIN.)_ +SELECT +books.title, +authors.first_name || ' ' || authors.last_name AS author +FROM books +JOIN authors ON books.author_id = authors.id; -- **Question 4** — List all books written by Stephen King. Show the title and published year, ordered by year. _(Hint: JOIN the two tables and filter on the author's name.)_ +SELECT + books.title, + authors.first_name || ' ' || authors.last_name AS author +FROM books +JOIN authors +ON books.author_id = authors.id +WHERE authors.first_name = 'Stephen' +AND authors.last_name = 'King' +ORDER BY books.published_year ASC; -- **Question 5** — Add yourself as a new author. Use your real name, or make one up. Pick any nationality and birth year. +INSERT INTO authors (first_name, last_name, nationality, birth_year) +VALUES ('Hamed', 'Razizadeh', 'Iranian', 1987); -- **Question 6** — Add one book for the author you just inserted. It can be a real book or a made-up one. +INSERT INTO books (title, author_id, genre, published_year) +VALUES ('Freedom For IRAN', +(SELECT id FROM authors WHERE first_name = 'Hamed' AND last_name = 'Razizadeh'), 'Documentary', 2026); -- **Question 7** — The genre for "The Dark Tower: The Gunslinger" was entered incorrectly as `'Fantasy'`. It should be `'Horror'`. Write an UPDATE to fix it, then verify the change with a SELECT. +SELECT id FROM books WHERE title = 'The Dark Tower: The Gunslinger'; +UPDATE books +SET genre = 'Horror' +WHERE title = 'The Dark Tower: The Gunslinger'; +SELECT id, title, genre FROM books WHERE title = 'The Dark Tower: The Gunslinger'; -- **Question 8** — Delete the book you added in Question 6. Make sure your query targets only that specific row. - ---- +DELETE FROM books +WHERE id = 101; +SELECT * FROM books WHERE id = 101; -- ### Bonus questions _(optional)_ -- These cover topics slightly beyond the core material. Have a go if you finish early. -- **Bonus A** — How many books are there per genre? Show the genre name and the count, ordered from most to fewest books. +SELECT genre, COUNT(*) AS book_count +FROM books +GROUP BY genre +ORDER BY book_count DESC; -- **Bonus B** — Find any authors in the database who have no books at all. _(Hint: you will need a LEFT JOIN and check for NULL.) +SELECT a.id, a.first_name, a.last_name +FROM authors a +LEFT JOIN books b ON a.id = b.author_id +WHERE b.id IS NULL; \ No newline at end of file From 2818e0788ab7b7eb4433f9d5324283b8f46cc28f Mon Sep 17 00:00:00 2001 From: Hamed Razizadeh Date: Wed, 1 Apr 2026 22:54:05 +0200 Subject: [PATCH 2/2] Task 2 --- task-2/data/data.json | 91 -------- task-2/data/flashcards.db | Bin 0 -> 16384 bytes task-2/migrate.js | 33 +++ task-2/package-lock.json | 467 ++++++++++++++++++++++++++++++++++++++ task-2/src/database.js | 85 ++++++- 5 files changed, 573 insertions(+), 103 deletions(-) delete mode 100644 task-2/data/data.json create mode 100644 task-2/data/flashcards.db create mode 100644 task-2/migrate.js create mode 100644 task-2/package-lock.json diff --git a/task-2/data/data.json b/task-2/data/data.json deleted file mode 100644 index 42a5b06..0000000 --- a/task-2/data/data.json +++ /dev/null @@ -1,91 +0,0 @@ -{ - "decks": [ - { - "id": 1, - "name": "JavaScript Basics", - "description": "Core JavaScript concepts" - }, - { - "id": 2, - "name": "SQL Fundamentals", - "description": "Writing database queries" - }, - { - "id": 3, - "name": "HTML & CSS", - "description": "Building web pages" - } - ], - "cards": [ - { - "id": 1, - "question": "What is a variable?", - "answer": "A named container for storing data values", - "learned": true, - "deckId": 1 - }, - { - "id": 2, - "question": "What does `const` mean?", - "answer": "Declares a variable that cannot be reassigned", - "learned": false, - "deckId": 1 - }, - { - "id": 3, - "question": "What is an array?", - "answer": "An ordered list of values", - "learned": true, - "deckId": 1 - }, - { - "id": 4, - "question": "What does `===` do?", - "answer": "Checks for strict equality (value AND type)", - "learned": false, - "deckId": 1 - }, - { - "id": 5, - "question": "What is SELECT used for?", - "answer": "Retrieving data from a database table", - "learned": false, - "deckId": 2 - }, - { - "id": 6, - "question": "What is a PRIMARY KEY?", - "answer": "A unique identifier for each row in a table", - "learned": false, - "deckId": 2 - }, - { - "id": 7, - "question": "What does WHERE do?", - "answer": "Filters rows in a query based on a condition", - "learned": true, - "deckId": 2 - }, - { - "id": 8, - "question": "What is a FOREIGN KEY?", - "answer": "A column that links to the primary key of another table", - "learned": false, - "deckId": 2 - }, - { - "id": 9, - "question": "What does a
do?", - "answer": "Creates a block-level container element", - "learned": false, - "deckId": 3 - }, - { - "id": 10, - "question": "What is the CSS box model?", - "answer": "Every element is a box with content, padding, border, and margin", - "learned": false, - "deckId": 3 - } - ] -} \ No newline at end of file diff --git a/task-2/data/flashcards.db b/task-2/data/flashcards.db new file mode 100644 index 0000000000000000000000000000000000000000..590940799dc300954fbec85a6e79dc6c4de7574b GIT binary patch literal 16384 zcmeI3&2Az`5XWZ#V`CXlZd}WUtc(_CH`+tAN?3yN;E!Ou3*$J}9_(hOZCW0BaQA?N zRym+3$2>*eAm=zVuXe_f<=z94-eHX~wlgr=cZk zo!MLFfxT_|k3@}+cR-7{4wV?*vBt3M-rSoy-f!Md-qbsNpO+wMBLYN#2oM1xKm>>Y z5g-CYfCvx)BJkc3c(jyrK7PI{Qg{S--y8M5=1QBl9AP3;mBi3vT7(+1IcMY3z2LBg z0~_7$_DIB$ke6`7doW~|TvswVXRF$M)q>_oM!2(=DU0=q5~&#$F?@T#G&gTil;C>H z%{fo12W-r`cCQcH)=eW(92QzpM97D!Hv9jK_lM*Ci8uNX0U|&IhyW2F0z`la5CI}U z1c(3;AOasafkGx*a&39WTEWGiwyt2w?EhDb8;YybX>VA?! 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'../data/flashcards.db'); +const DB_FILE = join(__dirname, "../data/flashcards.db"); const db = new Database(DB_FILE); @@ -21,23 +21,35 @@ const db = new Database(DB_FILE); export function getAllDecks() { // TODO: return all rows from the decks table - throw new Error('Not implemented'); + const rows = db.prepare("SELECT * FROM decks").all(); + return rows; } export function getDeckById(id) { // TODO: return the deck row with the given id, or null if not found - throw new Error('Not implemented'); + const row = db.prepare("SELECT * FROM decks WHERE id = ?").get(id); + return row ?? null; } export function addDeck(name, description) { // TODO: insert a new deck and return the new row (including its id) - throw new Error('Not implemented'); + const info = db + .prepare("insert into decks (name, description) values (?, ?)") + .run(name, description); + + return { + id: info.lastInsertRowid, + name, + description, + }; } export function deleteDeck(deckId) { // TODO: delete the deck with the given id // return true if a row was deleted, false otherwise - throw new Error('Not implemented'); + const info = db.prepare("delete from decks where id = ?").run(deckId); + + return info.changes > 0; } // ---------------------------------------------------------------- @@ -46,22 +58,71 @@ export function deleteDeck(deckId) { export function getAllCardsForDeck(deckId) { // TODO: return all card rows whose deckId matches - throw new Error('Not implemented'); + const rows = db + .prepare( + ` + SELECT id, question, answer, learned, deck_id AS deckId + FROM cards + WHERE deck_id = ? + `, + ) + .all(deckId); + + return rows; } export function addCard(question, answer, deckId) { // TODO: insert a new card and return the new row (including its id) - throw new Error('Not implemented'); + const info = db + .prepare( + ` + INSERT INTO cards (question, answer, deck_id) + VALUES (?, ?, ?) + `, + ) + .run(question, answer, deckId); + + return { + id: info.lastInsertRowid, + question, + answer, + learned: 0, + deckId, + }; } export function markCardLearned(cardId) { // TODO: set learned = 1 for the card with the given id // return the updated row, or null if not found - throw new Error('Not implemented'); + const info = db + .prepare( + ` + UPDATE cards + SET learned = 1 + WHERE id = ? + `, + ) + .run(cardId); + + if (info.changes === 0) return null; + + const row = db + .prepare( + ` + SELECT id, question, answer, learned, deck_id AS deckId + FROM cards + WHERE id = ? + `, + ) + .get(cardId); + + return row ?? null; } export function deleteCard(cardId) { // TODO: delete the card with the given id // return true if a row was deleted, false otherwise - throw new Error('Not implemented'); + const info = db.prepare("DELETE FROM cards WHERE id = ?").run(cardId); + + return info.changes > 0; }