Dagim H.

package.json

@@ -0,0 +1,21 @@
+{
+  "name": "c55-core-week-12",
+  "version": "1.0.0",
+  "description": "The week 12 assignment for the HackYourFuture Core program can be found at the following link: https://hub.hackyourfuture.nl/core-program-week-12-assignment",
+  "main": "index.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/Unlock7/c55-core-week-12.git"
+  },
+  "keywords": [],
+  "author": "",
+  "license": "ISC",
+  "type": "module",
+  "bugs": {
+    "url": "https://github.com/Unlock7/c55-core-week-12/issues"
+  },
+  "homepage": "https://github.com/Unlock7/c55-core-week-12#readme"
+}

task-1/queries.sql

@@ -1,27 +1,67 @@
 ---- Queries
 
 -- **Question 1** — List the title and published year of every book in the `'Science Fiction'` genre, ordered by published year (oldest first).
+SELECT b.title, b.published_year
+FROM books b 
+WHERE genre = 'Science Fiction'
+ORDER BY published_year ASC;
 
 -- **Question 2** — Show every book published before 1950. Display the title and year only.
-
+SELECT b.title, b.published_year
+FROM books b 
+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 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 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 ('Haddis', 'Alemayehu', 'Ethiopian', 1910);
 -- **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('Fikir Eske Mekabir', 1968, 'Tragedy/Romance', 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 books.title = 'The Dark Tower: The Gunslinger';
+--verifying the change!
+SELECT b.genre
+FROM books b 
+WHERE b.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 books.title = 'Fikir Eske Mekabir'
+  AND books.author_id = 25
+  AND books.published_year = 1968;
 ---
 
 -- ### 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 books_count
+FROM books
+GROUP BY genre
+ORDER BY 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
+FROM authors a 
+LEFT JOIN books AS b 
+ON a.id = b.author_id
+WHERE b.id IS NULL;

task-2/migrate.js

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+import fs from 'fs';
+import Database from 'better-sqlite3';
+
+// Read data/data.json
+const raw = fs.readFileSync('./data/data.json', 'utf8');
+const data = JSON.parse(raw);
+
+// Open data/flashcards.db
+const db = new Database('./data/flashcards.db');
+
+// Prepare insert statements
+const insertDeck = db.prepare(`
+  INSERT INTO decks (name, description)
+  VALUES (?, ?)
+`);
+
+const insertCard = db.prepare(`
+  INSERT INTO cards (question, answer, learned, deck_id)
+  VALUES (?, ?, ?, ?)
+`);
+
+//Insert decks
+const deckIdMap = {};
+
+for (const deck of data.decks) {
+  const result = insertDeck.run(deck.name, deck.description);
+  deckIdMap[deck.id] = result.lastInsertRowid;
+}
+
+//Insert cards
+for (const card of data.cards) {
+  insertCard.run(card.question, card.answer, card.learned ? 1 : 0, deckIdMap[card.deckId]);
+}
+
+console.log('Migration complete!');