Mohammed A

task-1/queries.sql

@@ -1,21 +1,54 @@
----- Queries
+-- 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;
 
 -- **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, books.published_year
+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 ('Zeus', 'Moha', 'Yemeni', 2002);
 
 -- **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, published_year, genre, author_id)
+VALUES (
+    'The HackYourFuture Story: My Transformation into a Developer',
+    2026,
+    'Education',
+    (SELECT id FROM authors WHERE first_name = 'Zeus' AND last_name = 'Moha')
+);
 
 -- **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.
+UPDATE books
+SET genre = 'Horror'
+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.
+SELECT 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 title = 'The HackYourFuture Story: My Transformation into a Developer'
+  AND author_id = (SELECT id FROM authors WHERE first_name = 'Zeus' AND last_name = 'Moha');
 ---
 
 -- ### Bonus questions _(optional)_

task-2/migrate.js

@@ -0,0 +1,42 @@
+import Database from "better-sqlite3";
+import { readFileSync } from "fs";
+import { fileURLToPath } from "url";
+import { dirname, join } from "path";
+
+const __dirname = dirname(fileURLToPath(import.meta.url));
+
+const DATA_FILE = join(__dirname, "data/data.json");
+const DB_FILE = join(__dirname, "data/flashcards.db");
+
+const raw = readFileSync(DATA_FILE, "utf-8");
+const data = JSON.parse(raw);
+
+const db = new Database(DB_FILE);
+
+const insertDeck = db.prepare(
+  "INSERT INTO decks (id, name, description) VALUES (?, ?, ?)",
+);
+
+const insertCard = db.prepare(
+  "INSERT INTO cards (id, question, answer, learned, deck_id) VALUES (?, ?, ?, ?, ?)",
+);
+
+const migrate = db.transaction(() => {
+  for (const deck of data.decks) {
+    insertDeck.run(deck.id, deck.name, deck.description);
+  }
+
+  for (const card of data.cards) {
+    insertCard.run(
+      card.id,
+      card.question,
+      card.answer,
+      card.learned ? 1 : 0,
+      card.deckId,
+    );
+  }
+});
+
+migrate();
+
+console.log("Migration completed.");