Pavel T

task-1/queries.sql

@@ -1,20 +1,51 @@
 ---- 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 ('Pavel', 'Tisner', 'Russian', 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, published_year, genre, author_id)
+VALUES ('My way', 2026, 'Fiction',  (SELECT id FROM authors WHERE last_name = 'Tisner'));
 
 -- **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 = 'Fantasy'
+WHERE title = 'Harry Potter and the Deathly Hallows';
 
 -- **Question 8** — Delete the book you added in Question 6. Make sure your query targets only that specific row.
+DELETE FROM books
+WHERE title = 'My way'
+  AND published_year = 2026;
 
 ---
 

task-2/migrate.js

@@ -0,0 +1,25 @@
+import fs from 'fs';
+import Database from 'better-sqlite3';
+
+const data = JSON.parse(fs.readFileSync('data/data.json', 'utf-8'));
+const db = new Database('data/flashcards.db');
+
+for (const deck of data.decks) {
+    db.prepare('INSERT INTO decks (name, description) VALUES (@name, @description)')
+      .run({
+        name: deck.name,
+        description: deck.description
+      });
+}
+
+for (const card of data.cards) {
+    db.prepare('INSERT INTO cards (question, answer, learned, deck_id) VALUES (@question, @answer, @learned, @deck_id)')
+      .run({
+        question: card.question,
+        answer: card.answer,
+        learned: card.learned ? 1 : 0,
+        deck_id: card.deckId
+      });
+}
+
+db.close();