From b1c30fbcc11fa71361606c9fd58adaa415af6e26 Mon Sep 17 00:00:00 2001
From: Dagim02 <dagimvanhaileselassie@gmail.com>
Date: Wed, 1 Apr 2026 17:26:36 +0200
Subject: [PATCH 1/2] complete: Task1 & 2.

---
 package.json              |  21 ++
 task-1/books_library.db   | Bin 24576 -> 24576 bytes
 task-1/queries.sql        |  50 +++-
 task-2/data/flashcards.db | Bin 0 -> 16384 bytes
 task-2/migrate.js         |  35 +++
 task-2/package-lock.json  | 467 ++++++++++++++++++++++++++++++++++++++
 task-2/setup.sql          |  16 ++
 task-2/src/database.js    |  90 +++++++-
 8 files changed, 662 insertions(+), 17 deletions(-)
 create mode 100644 package.json
 create mode 100644 task-2/data/flashcards.db
 create mode 100644 task-2/migrate.js
 create mode 100644 task-2/package-lock.json
 create mode 100644 task-2/setup.sql

diff --git a/package.json b/package.json
new file mode 100644
index 0000000..80aeacc
--- /dev/null
+++ b/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"
+}
diff --git a/task-1/books_library.db b/task-1/books_library.db
index 88b0418c6cf5291e897c14742bfcd1b1868c352a..9c03a1e25fe12041ed07420a5fbc77c47fdddf9b 100644
GIT binary patch
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diff --git a/task-1/queries.sql b/task-1/queries.sql
index fecf7ad..01ebdc5 100644
--- a/task-1/queries.sql
+++ b/task-1/queries.sql
@@ -1,21 +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 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'; -- or can be handled by using Id number too.
 ---
 
 -- ### Bonus questions _(optional)_
@@ -23,5 +53,13 @@
 -- 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;
\ No newline at end of file
diff --git a/task-2/data/flashcards.db b/task-2/data/flashcards.db
new file mode 100644
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diff --git a/task-2/migrate.js b/task-2/migrate.js
new file mode 100644
index 0000000..24a6665
--- /dev/null
+++ b/task-2/migrate.js
@@ -0,0 +1,35 @@
+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!');
diff --git a/task-2/package-lock.json b/task-2/package-lock.json
new file mode 100644
index 0000000..72fc35b
--- /dev/null
+++ b/task-2/package-lock.json
@@ -0,0 +1,467 @@
+{
+  "name": "flashcard-app",
+  "version": "1.0.0",
+  "lockfileVersion": 3,
+  "requires": true,
+  "packages": {
+    "": {
+      "name": "flashcard-app",
+      "version": "1.0.0",
+      "dependencies": {
+        "better-sqlite3": "^12.8.0"
+      }
+    },
+    "node_modules/base64-js": {
+      "version": "1.5.1",
+      "resolved": "https://registry.npmjs.org/base64-js/-/base64-js-1.5.1.tgz",
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+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/feross"
+        },
+        {
+          "type": "patreon",
+          "url": "https://www.patreon.com/feross"
+        },
+        {
+          "type": "consulting",
+          "url": "https://feross.org/support"
+        }
+      ],
+      "license": "MIT"
+    },
+    "node_modules/better-sqlite3": {
+      "version": "12.8.0",
+      "resolved": "https://registry.npmjs.org/better-sqlite3/-/better-sqlite3-12.8.0.tgz",
+      "integrity": "sha512-RxD2Vd96sQDjQr20kdP+F+dK/1OUNiVOl200vKBZY8u0vTwysfolF6Hq+3ZK2+h8My9YvZhHsF+RSGZW2VYrPQ==",
+      "hasInstallScript": true,
+      "license": "MIT",
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+        "prebuild-install": "^7.1.1"
+      },
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+      "license": "MIT",
+      "dependencies": {
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+        "inherits": "^2.0.4",
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+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/feross"
+        },
+        {
+          "type": "patreon",
+          "url": "https://www.patreon.com/feross"
+        },
+        {
+          "type": "consulting",
+          "url": "https://feross.org/support"
+        }
+      ],
+      "license": "MIT",
+      "dependencies": {
+        "base64-js": "^1.3.1",
+        "ieee754": "^1.1.13"
+      }
+    },
+    "node_modules/chownr": {
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+    },
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+      "license": "MIT"
+    },
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+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/feross"
+        },
+        {
+          "type": "patreon",
+          "url": "https://www.patreon.com/feross"
+        },
+        {
+          "type": "consulting",
+          "url": "https://feross.org/support"
+        }
+      ],
+      "license": "BSD-3-Clause"
+    },
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+      "license": "ISC"
+    },
+    "node_modules/mimic-response": {
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/mimic-response/-/mimic-response-3.1.0.tgz",
+      "integrity": "sha512-z0yWI+4FDrrweS8Zmt4Ej5HdJmky15+L2e6Wgn3+iK5fWzb6T3fhNFq2+MeTRb064c6Wr4N/wv0DzQTjNzHNGQ==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=10"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/sindresorhus"
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+      "funding": {
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+      }
+    },
+    "node_modules/mkdirp-classic": {
+      "version": "0.5.3",
+      "resolved": "https://registry.npmjs.org/mkdirp-classic/-/mkdirp-classic-0.5.3.tgz",
+      "integrity": "sha512-gKLcREMhtuZRwRAfqP3RFW+TK4JqApVBtOIftVgjuABpAtpxhPGaDcfvbhNvD0B8iD1oUr/txX35NjcaY6Ns/A==",
+      "license": "MIT"
+    },
+    "node_modules/napi-build-utils": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/napi-build-utils/-/napi-build-utils-2.0.0.tgz",
+      "integrity": "sha512-GEbrYkbfF7MoNaoh2iGG84Mnf/WZfB0GdGEsM8wz7Expx/LlWf5U8t9nvJKXSp3qr5IsEbK04cBGhol/KwOsWA==",
+      "license": "MIT"
+    },
+    "node_modules/node-abi": {
+      "version": "3.89.0",
+      "resolved": "https://registry.npmjs.org/node-abi/-/node-abi-3.89.0.tgz",
+      "integrity": "sha512-6u9UwL0HlAl21+agMN3YAMXcKByMqwGx+pq+P76vii5f7hTPtKDp08/H9py6DY+cfDw7kQNTGEj/rly3IgbNQA==",
+      "license": "MIT",
+      "dependencies": {
+        "semver": "^7.3.5"
+      },
+      "engines": {
+        "node": ">=10"
+      }
+    },
+    "node_modules/once": {
+      "version": "1.4.0",
+      "resolved": "https://registry.npmjs.org/once/-/once-1.4.0.tgz",
+      "integrity": "sha512-lNaJgI+2Q5URQBkccEKHTQOPaXdUxnZZElQTZY0MFUAuaEqe1E+Nyvgdz/aIyNi6Z9MzO5dv1H8n58/GELp3+w==",
+      "license": "ISC",
+      "dependencies": {
+        "wrappy": "1"
+      }
+    },
+    "node_modules/prebuild-install": {
+      "version": "7.1.3",
+      "resolved": "https://registry.npmjs.org/prebuild-install/-/prebuild-install-7.1.3.tgz",
+      "integrity": "sha512-8Mf2cbV7x1cXPUILADGI3wuhfqWvtiLA1iclTDbFRZkgRQS0NqsPZphna9V+HyTEadheuPmjaJMsbzKQFOzLug==",
+      "deprecated": "No longer maintained. Please contact the author of the relevant native addon; alternatives are available.",
+      "license": "MIT",
+      "dependencies": {
+        "detect-libc": "^2.0.0",
+        "expand-template": "^2.0.3",
+        "github-from-package": "0.0.0",
+        "minimist": "^1.2.3",
+        "mkdirp-classic": "^0.5.3",
+        "napi-build-utils": "^2.0.0",
+        "node-abi": "^3.3.0",
+        "pump": "^3.0.0",
+        "rc": "^1.2.7",
+        "simple-get": "^4.0.0",
+        "tar-fs": "^2.0.0",
+        "tunnel-agent": "^0.6.0"
+      },
+      "bin": {
+        "prebuild-install": "bin.js"
+      },
+      "engines": {
+        "node": ">=10"
+      }
+    },
+    "node_modules/pump": {
+      "version": "3.0.4",
+      "resolved": "https://registry.npmjs.org/pump/-/pump-3.0.4.tgz",
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+      "license": "MIT",
+      "dependencies": {
+        "end-of-stream": "^1.1.0",
+        "once": "^1.3.1"
+      }
+    },
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+      "version": "1.2.8",
+      "resolved": "https://registry.npmjs.org/rc/-/rc-1.2.8.tgz",
+      "integrity": "sha512-y3bGgqKj3QBdxLbLkomlohkvsA8gdAiUQlSBJnBhfn+BPxg4bc62d8TcBW15wavDfgexCgccckhcZvywyQYPOw==",
+      "license": "(BSD-2-Clause OR MIT OR Apache-2.0)",
+      "dependencies": {
+        "deep-extend": "^0.6.0",
+        "ini": "~1.3.0",
+        "minimist": "^1.2.0",
+        "strip-json-comments": "~2.0.1"
+      },
+      "bin": {
+        "rc": "cli.js"
+      }
+    },
+    "node_modules/readable-stream": {
+      "version": "3.6.2",
+      "resolved": "https://registry.npmjs.org/readable-stream/-/readable-stream-3.6.2.tgz",
+      "integrity": "sha512-9u/sniCrY3D5WdsERHzHE4G2YCXqoG5FTHUiCC4SIbr6XcLZBY05ya9EKjYek9O5xOAwjGq+1JdGBAS7Q9ScoA==",
+      "license": "MIT",
+      "dependencies": {
+        "inherits": "^2.0.3",
+        "string_decoder": "^1.1.1",
+        "util-deprecate": "^1.0.1"
+      },
+      "engines": {
+        "node": ">= 6"
+      }
+    },
+    "node_modules/safe-buffer": {
+      "version": "5.2.1",
+      "resolved": "https://registry.npmjs.org/safe-buffer/-/safe-buffer-5.2.1.tgz",
+      "integrity": "sha512-rp3So07KcdmmKbGvgaNxQSJr7bGVSVk5S9Eq1F+ppbRo70+YeaDxkw5Dd8NPN+GD6bjnYm2VuPuCXmpuYvmCXQ==",
+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/feross"
+        },
+        {
+          "type": "patreon",
+          "url": "https://www.patreon.com/feross"
+        },
+        {
+          "type": "consulting",
+          "url": "https://feross.org/support"
+        }
+      ],
+      "license": "MIT"
+    },
+    "node_modules/semver": {
+      "version": "7.7.4",
+      "resolved": "https://registry.npmjs.org/semver/-/semver-7.7.4.tgz",
+      "integrity": "sha512-vFKC2IEtQnVhpT78h1Yp8wzwrf8CM+MzKMHGJZfBtzhZNycRFnXsHk6E5TxIkkMsgNS7mdX3AGB7x2QM2di4lA==",
+      "license": "ISC",
+      "bin": {
+        "semver": "bin/semver.js"
+      },
+      "engines": {
+        "node": ">=10"
+      }
+    },
+    "node_modules/simple-concat": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/simple-concat/-/simple-concat-1.0.1.tgz",
+      "integrity": "sha512-cSFtAPtRhljv69IK0hTVZQ+OfE9nePi/rtJmw5UjHeVyVroEqJXP1sFztKUy1qU+xvz3u/sfYJLa947b7nAN2Q==",
+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/feross"
+        },
+        {
+          "type": "patreon",
+          "url": "https://www.patreon.com/feross"
+        },
+        {
+          "type": "consulting",
+          "url": "https://feross.org/support"
+        }
+      ],
+      "license": "MIT"
+    },
+    "node_modules/simple-get": {
+      "version": "4.0.1",
+      "resolved": "https://registry.npmjs.org/simple-get/-/simple-get-4.0.1.tgz",
+      "integrity": "sha512-brv7p5WgH0jmQJr1ZDDfKDOSeWWg+OVypG99A/5vYGPqJ6pxiaHLy8nxtFjBA7oMa01ebA9gfh1uMCFqOuXxvA==",
+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/feross"
+        },
+        {
+          "type": "patreon",
+          "url": "https://www.patreon.com/feross"
+        },
+        {
+          "type": "consulting",
+          "url": "https://feross.org/support"
+        }
+      ],
+      "license": "MIT",
+      "dependencies": {
+        "decompress-response": "^6.0.0",
+        "once": "^1.3.1",
+        "simple-concat": "^1.0.0"
+      }
+    },
+    "node_modules/string_decoder": {
+      "version": "1.3.0",
+      "resolved": "https://registry.npmjs.org/string_decoder/-/string_decoder-1.3.0.tgz",
+      "integrity": "sha512-hkRX8U1WjJFd8LsDJ2yQ/wWWxaopEsABU1XfkM8A+j0+85JAGppt16cr1Whg6KIbb4okU6Mql6BOj+uup/wKeA==",
+      "license": "MIT",
+      "dependencies": {
+        "safe-buffer": "~5.2.0"
+      }
+    },
+    "node_modules/strip-json-comments": {
+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/strip-json-comments/-/strip-json-comments-2.0.1.tgz",
+      "integrity": "sha512-4gB8na07fecVVkOI6Rs4e7T6NOTki5EmL7TUduTs6bu3EdnSycntVJ4re8kgZA+wx9IueI2Y11bfbgwtzuE0KQ==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=0.10.0"
+      }
+    },
+    "node_modules/tar-fs": {
+      "version": "2.1.4",
+      "resolved": "https://registry.npmjs.org/tar-fs/-/tar-fs-2.1.4.tgz",
+      "integrity": "sha512-mDAjwmZdh7LTT6pNleZ05Yt65HC3E+NiQzl672vQG38jIrehtJk/J3mNwIg+vShQPcLF/LV7CMnDW6vjj6sfYQ==",
+      "license": "MIT",
+      "dependencies": {
+        "chownr": "^1.1.1",
+        "mkdirp-classic": "^0.5.2",
+        "pump": "^3.0.0",
+        "tar-stream": "^2.1.4"
+      }
+    },
+    "node_modules/tar-stream": {
+      "version": "2.2.0",
+      "resolved": "https://registry.npmjs.org/tar-stream/-/tar-stream-2.2.0.tgz",
+      "integrity": "sha512-ujeqbceABgwMZxEJnk2HDY2DlnUZ+9oEcb1KzTVfYHio0UE6dG71n60d8D2I4qNvleWrrXpmjpt7vZeF1LnMZQ==",
+      "license": "MIT",
+      "dependencies": {
+        "bl": "^4.0.3",
+        "end-of-stream": "^1.4.1",
+        "fs-constants": "^1.0.0",
+        "inherits": "^2.0.3",
+        "readable-stream": "^3.1.1"
+      },
+      "engines": {
+        "node": ">=6"
+      }
+    },
+    "node_modules/tunnel-agent": {
+      "version": "0.6.0",
+      "resolved": "https://registry.npmjs.org/tunnel-agent/-/tunnel-agent-0.6.0.tgz",
+      "integrity": "sha512-McnNiV1l8RYeY8tBgEpuodCC1mLUdbSN+CYBL7kJsJNInOP8UjDDEwdk6Mw60vdLLrr5NHKZhMAOSrR2NZuQ+w==",
+      "license": "Apache-2.0",
+      "dependencies": {
+        "safe-buffer": "^5.0.1"
+      },
+      "engines": {
+        "node": "*"
+      }
+    },
+    "node_modules/util-deprecate": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/util-deprecate/-/util-deprecate-1.0.2.tgz",
+      "integrity": "sha512-EPD5q1uXyFxJpCrLnCc1nHnq3gOa6DZBocAIiI2TaSCA7VCJ1UJDMagCzIkXNsUYfD1daK//LTEQ8xiIbrHtcw==",
+      "license": "MIT"
+    },
+    "node_modules/wrappy": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
+      "integrity": "sha512-l4Sp/DRseor9wL6EvV2+TuQn63dMkPjZ/sp9XkghTEbV9KlPS1xUsZ3u7/IQO4wxtcFB4bgpQPRcR3QCvezPcQ==",
+      "license": "ISC"
+    }
+  }
+}
diff --git a/task-2/setup.sql b/task-2/setup.sql
new file mode 100644
index 0000000..142aea5
--- /dev/null
+++ b/task-2/setup.sql
@@ -0,0 +1,16 @@
+      ---DECKS---
+CREATE TABLE decks (
+id INTEGER PRIMARY KEY AUTOINCREMENT,
+name TEXT NOT NULL,
+description TEXT
+);
+
+     ---CARDS---
+CREATE TABLE cards (
+id INTEGER PRIMARY KEY AUTOINCREMENT,
+question TEXT NOT NULL,
+answer TEXT NOT NULL,
+learned TEXT NOT NULL DEFAULT 0,
+deckId INTEGER NOT NULL, 
+FOREIGN KEY (deckId) REFERENCES decks(id)
+);
\ No newline at end of file
diff --git a/task-2/src/database.js b/task-2/src/database.js
index a737fcb..b6fddba 100644
--- a/task-2/src/database.js
+++ b/task-2/src/database.js
@@ -21,23 +21,50 @@ const db = new Database(DB_FILE);
 
 export function getAllDecks() {
   // TODO: return all rows from the decks table
-  throw new Error('Not implemented');
+  try {
+    const stmt = db.prepare('SELECT * FROM decks');
+    const decks = stmt.all();
+    return decks;
+  } catch (err) {
+    throw new Error(`Failed to load decks: ${err.message}`);
+  }
 }
 
 export function getDeckById(id) {
   // TODO: return the deck row with the given id, or null if not found
-  throw new Error('Not implemented');
+  try {
+    const stmt = db.prepare('SELECT * FROM decks WHERE id = ?');
+    const deck = stmt.get(id);
+    return deck || null;
+  } catch (err) {
+    throw new Error(`Failed to fetch deck with id ${id}: ${err.message}`);
+  }
 }
 
 export function addDeck(name, description) {
   // TODO: insert a new deck and return the new row (including its id)
-  throw new Error('Not implemented');
+  try {
+    const stmt = db.prepare(`
+      INSERT INTO decks (name, description)
+      VALUES (?, ?)
+      `);
+    const result = stmt.run(name, description);
+    const deck = db.prepare('SELECT * FROM decks WHERE id = ?').get(result.lastInsertRowid);
+    return deck;
+  } catch (err) {
+    throw new Error(`Failed to add deck: ${err.message}`);
+  }
 }
-
-export function deleteDeck(deckId) {
+export function deleteDeck(id) {
   // TODO: delete the deck with the given id
   //       return true if a row was deleted, false otherwise
-  throw new Error('Not implemented');
+  try {
+    const stmt = db.prepare('DELETE FROM decks WHERE id = ?');
+    const result = stmt.run(id);
+    return result.changes > 0;
+  } catch (err) {
+    throw new Error(`Failed to delete deck with id: ${id}: ${err.message}`);
+  }
 }
 
 // ----------------------------------------------------------------
@@ -46,22 +73,63 @@ export function deleteDeck(deckId) {
 
 export function getAllCardsForDeck(deckId) {
   // TODO: return all card rows whose deckId matches
-  throw new Error('Not implemented');
+  try {
+    const stmt = db.prepare(`
+      SELECT * FROM cards WHERE id = ?`);
+    const cards = stmt.all(deckId);
+
+    return cards;
+  } catch (err) {
+    throw new Error(`Failed to load cards for deck ${deckId}: ${err.message}`);
+  }
 }
 
 export function addCard(question, answer, deckId) {
   // TODO: insert a new card and return the new row (including its id)
-  throw new Error('Not implemented');
+  try {
+    const stmt = db.prepare(`
+  INSERT INTO cards (question, answer, learned, deckId)
+  VALUES (?, ?, 0, ?)
+  
+  `);
+    const result = stmt.run(question, answer, deckId);
+    const card = db.prepare('SELECT * FROM cards WHERE id = ?').get(result.lastInsertRowid);
+    return card;
+  } catch (err) {
+    throw new Error(`Failed to add card: ${err.message}`);
+  }
 }
 
 export function markCardLearned(cardId) {
   // TODO: set learned = 1 for the card with the given id
   //       return the updated row, or null if not found
-  throw new Error('Not implemented');
+  try {
+    const stmt = db.prepare(`
+      UPDATE cards 
+      SET learned = 1
+      WHERE id = ?
+      `);
+    const result = stmt.run(cardId);
+    if (result.changes === 0) {
+      return null;
+    }
+    const card = db.prepare(`SELECT * FROM cards WHERE id = ?`).get(cardId);
+    return card;
+  } catch (err) {
+    throw new Error(`Failed to mark card learned: ${err.message}`);
+  }
 }
-
 export function deleteCard(cardId) {
   // TODO: delete the card with the given id
   //       return true if a row was deleted, false otherwise
-  throw new Error('Not implemented');
+  try {
+    const stmt = db.prepare(`
+  DELETE FROM cards WHERE id = ?
+  
+  `);
+    const result = stmt.run(cardId);
+    return result.changes > 0;
+  } catch (err) {
+    throw new Error(`Failed to delete card with id: ${cardId}: ${err.message}`);
+  }
 }

From 2c870ff184515fd045265c871d16fbd72e5dd475 Mon Sep 17 00:00:00 2001
From: Unlock7 <dagimvanhaileselassie@gmail.com>
Date: Wed, 1 Apr 2026 17:53:19 +0200
Subject: [PATCH 2/2] Update task-1/queries.sql

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
---
 task-1/queries.sql | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/task-1/queries.sql b/task-1/queries.sql
index 01ebdc5..4b46d7b 100644
--- a/task-1/queries.sql
+++ b/task-1/queries.sql
@@ -45,7 +45,9 @@ 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'; -- or can be handled by using Id number too.
+WHERE books.title = 'Fikir Eske Mekabir'
+  AND books.author_id = 25
+  AND books.published_year = 1968;
 ---
 
 -- ### Bonus questions _(optional)_