Muna N.

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 DESC;
 
 -- **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 b.title,  a.first_name || ''|| a.last_name AS auther_name
+FROM books b
+JOIN authors a ON b.author_id=a.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 b.title, b.published_year
+FROM books b
+JOIN authors a ON b.author_id = a.id
+WHERE a.first_name ='Stephen' AND a.last_name='King'
+ORDER BY b.published_year;
+
 -- **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('Muna', 'Nasher', 'Yemeni', 1999);
+
+SELECT * FROM authors 
+WHERE last_name= 'Nasher' ;
 
 -- **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)
+VALUES ('The Light of life', 25) ;
+
 
 -- **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 * 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 IN (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_Category
+FROM books
+GROUP BY genre
+ORDER BY book_Category ;
 -- **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.first_name, a.last_name
+FROM authors a
+LEFT JOIN books b ON a.id=b.author_id
+WHERE b.id IS NULL;

task-2/migrate.js

@@ -0,0 +1,34 @@
+import fs from 'fs';
+import Database from 'better-sqlite3';
+import { fileURLToPath } from 'url';
+import { dirname, join } from 'path';
+
+const __dirname = dirname(fileURLToPath(import.meta.url));
+const db = new Database(join(__dirname, 'flashcards.db'));
+
+const data = JSON.parse(
+  fs.readFileSync(join(__dirname, 'data', 'data.json'), 'utf-8')
+);
+
+
+for (const deck of data.decks) {
+  db.prepare(
+    'INSERT INTO decks (id, name, description) VALUES (?, ?, ?)'
+  ).run(deck.id, deck.name, deck.description);
+}
+
+
+for (const card of data.cards) {
+  db.prepare(`
+    INSERT INTO cards (id, question, answer, learned, deck_id)
+    VALUES (?, ?, ?, ?, ?)
+  `).run(
+    card.id,
+    card.question,
+    card.answer,
+    card.learned ? 1 : 0,
+    card.deckId
+  );
+}
+
+console.log('✅ Migration done!');