Hamed R.

task-1/package.json

@@ -0,0 +1,16 @@
+{
+  "name": "task-1",
+  "version": "1.0.0",
+  "description": "For this task use the books_library database. 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"
+  }
+}

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;

task-2/migrate.js

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+import Database from "better-sqlite3";
+import { readFileSync } from "fs";
+
+const db = new Database("./data/flashcards.db");
+
+const raw = readFileSync("./data/data.json", "utf-8");
+const data = JSON.parse(raw);
+
+// insert decks
+const insertDeck = db.prepare(
+  "INSERT INTO decks (id, name, description) VALUES (?, ?, ?)",
+);
+
+for (const deck of data.decks) {
+  insertDeck.run(deck.id, deck.name, deck.description);
+}
+
+// insert cards
+const insertCard = db.prepare(
+  "INSERT INTO cards (id, question, answer, learned, deck_id) VALUES (?, ?, ?, ?, ?)",
+);
+
+for (const card of data.cards) {
+  insertCard.run(
+    card.id,
+    card.question,
+    card.answer,
+    card.learned ? 1 : 0,
+    card.deckId,
+  );
+}
+
+console.log("Migration complete!");