Hannah N

task-1/queries.sql

@@ -2,20 +2,52 @@
 
 -- **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 b
+WHERE b.genre = "Science Fiction"
+ORDER BY b.published_year ASC ;
+
 -- **Question 2** — Show every book published before 1950. Display the title and year only.
 
+SELECT  title,published_year FROM books b
+WHERE b.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 author
+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 ('Hannah', 'Nyongo', 'Dutch', 1942);
+
 -- **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, author_id)
+VALUES ('The Joy of Life', 2002, 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';
+
+SELECT * FROM books
+WHERE genre = 'Horror';
+
 -- **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 Joy of Life';
 ---
 
 -- ### Bonus questions _(optional)_
@@ -24,4 +56,9 @@
 
 -- **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 total_books
+FROM books
+GROUP BY genre
+ORDER BY total_books 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.)

task-2/migrate.js

@@ -0,0 +1,36 @@
+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 (id, name, description) VALUES (?, ?, ?)").run(
+    deck.id,
+    deck.name,
+    deck.description,
+  );
+
+  console.log(`Added deck: ${deck.name}`);
+}
+
+// loop through every card in the JSON file
+for (const card of data.cards) {
+  const learned = card.learned ? 1 : 0;
+
+  db.prepare(
+    "INSERT INTO cards (id, question, answer, learned, deck_id) VALUES (?, ?, ?, ?, ?)",
+  ).run(
+    card.id, // the card id
+    card.question, // the question
+    card.answer, // the answer
+    learned, // 1 or 0
+    card.deckId, // which deck it belongs to
+  );
+
+  // tell us what is happening
+  console.log(`Added card: ${card.question}`);
+}
+
+console.log("Migration done! All decks and cards are in the database.");