Shadi A.

task-1/queries.sql

@@ -1,20 +1,46 @@
 ---- 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  a.first_name || ' ' || a.last_name AS author, b.title, b.genre, b.published_year FROM authors a
+JOIN books b ON a.id = b.author_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 a.first_name || ' ' || a.last_name AS author, b.title, b.published_year FROM authors a
+JOIN books b ON a.id = b.author_id 
+WHERE author = 'Stephen King' ORDER BY published_year DESC;
+
 -- **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 
+('Shadi', 'Abedinpour', 'Iranian', 1995); 
+
 -- **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 Story of My Cats', 2023, 'Biography', 
+(SELECT id FROM authors WHERE first_name = 'Shadi' AND last_name = 'Abedinpour'));
+
 -- **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';
+ 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 = 101
 
 ---
 
@@ -23,5 +49,11 @@
 -- 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.first_name || ' ' || a.last_name AS author 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 sqlite3 from "sqlite3"; 
+
+const data = JSON.parse(
+  fs.readFileSync("./data/data.json", "utf-8")
+);
+
+const db = new sqlite3.Database("./data/flashcards.db");
+
+db.run("PRAGMA foreign_keys = ON");
+
+data.decks.forEach((deck) => {
+  db.run(
+    `INSERT INTO decks (id, name, description) VALUES (?, ?, ?)`,
+    [deck.id, deck.name, deck.description]
+  );
+});
+
+
+data.cards.forEach((card) => {
+  db.run(
+    `INSERT INTO cards (id, question, answer, learned, deck_id)
+     VALUES (?, ?, ?, ?, ?)`,
+    [
+      card.id,
+      card.question,
+      card.answer,
+      card.learned ? 1 : 0,
+      card.deckId
+    ]
+  );
+});
+
+db.close();