Frida Anselin

core-and-extension.sql

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+/* core */
+
+CREATE TABLE IF NOT EXISTS films (
+  id SERIAL PRIMARY KEY,
+  title TEXT NOT NULL,
+  genre TEXT NOT NULL,
+  release_year INTEGER,
+  score INTEGER,
+  UNIQUE(title)
+);
+
+
+INSERT INTO films
+	(title, genre, release_year, score)
+VALUES
+    ('The Shawshank Redemption', 'Drama', 1994, 9),
+  ('The Godfather', 'Crime', 1972, 9),
+  ('The Dark Knight', 'Action', 2008, 9),
+  ('Alien', 'SciFi', 1979, 9),
+  ('Total Recall', 'SciFi', 1990, 8),
+  ('The Matrix', 'SciFi', 1999, 8),
+  ('The Matrix Resurrections', 'SciFi', 2021, 5),
+  ('The Matrix Reloaded', 'SciFi', 2003, 6),
+  ('The Hunt for Red October', 'Thriller', 1990, 7),
+  ('Misery', 'Thriller', 1990, 7),
+  ('The Power Of The Dog', 'Western', 2021, 6),
+  ('Hell or High Water', 'Western', 2016, 8),
+  ('The Good the Bad and the Ugly', 'Western', 1966, 9),
+  ('Unforgiven', 'Western', 1992, 7);
+
+SELECT *
+FROM films;
+
+SELECT *
+FROM films
+ORDER BY score DESC;
+
+SELECT *
+FROM films
+ORDER BY release_year ASC;
+
+SELECT *
+FROM films
+WHERE score >= 8;
+
+SELECT *
+FROM films
+WHERE score <= 7;
+
+SELECT *
+FROM films
+WHERE release_year = 1990;
+
+SELECT *
+FROM films
+WHERE release_year < 2000;
+
+SELECT *
+FROM films
+WHERE release_year > 1990;
+
+SELECT *
+FROM films
+WHERE release_year BETWEEN 1990 AND 1999;
+
+SELECT *
+FROM films
+WHERE genre = 'SciFi';
+
+SELECT *
+FROM films
+WHERE genre = 'SciFi' OR genre = 'Western';
+
+SELECT *
+FROM films
+WHERE NOT genre = 'SciFi';
+
+SELECT *
+FROM films
+WHERE genre = 'Western' AND release_year < 2000;
+
+SELECT *
+FROM films
+WHERE title LIKE '%Matrix%';
+
+/* extension 1 */
+
+SELECT AVG(score)
+FROM films;
+
+SELECT COUNT(*)
+FROM films;
+
+SELECT genre, AVG(score)
+FROM films
+GROUP BY genre;
+
+/* extension 2 */
+
+TRUNCATE TABLE directors;
+CREATE TABLE IF NOT EXISTS directors (
+  id INTEGER PRIMARY KEY,
+  name TEXT NOT NULL,
+  UNIQUE(id)
+);
+
+INSERT INTO directors
+	(id, name)
+VALUES
+	(1, 'frida'),
+  (2, 'elias'),
+  (3, 'theo');
+
+CREATE TABLE IF NOT EXISTS new_films (
+  id SERIAL PRIMARY KEY,
+  title TEXT NOT NULL,
+  genre TEXT NOT NULL,
+  release_year INTEGER,
+  score INTEGER,
+  director_id INTEGER,
+  UNIQUE(title)
+);
+
+INSERT INTO new_films
+	(title, genre, release_year, score, director_id)
+VALUES
+	('The Shawshank Redemption', 'Drama', 1994, 9, 1),
+  ('The Godfather', 'Crime', 1972, 9, 2),
+  ('The Dark Knight', 'Action', 2008, 9, 3),
+  ('Alien', 'SciFi', 1979, 9, 1),
+  ('Total Recall', 'SciFi', 1990, 8, 2),
+  ('The Matrix', 'SciFi', 1999, 8, 3),
+  ('The Matrix Resurrections', 'SciFi', 2021, 5, 1),
+  ('The Matrix Reloaded', 'SciFi', 2003, 6, 2),
+  ('The Hunt for Red October', 'Thriller', 1990, 7, 3),
+  ('Misery', 'Thriller', 1990, 7, 1),
+  ('The Power Of The Dog', 'Western', 2021, 6, 2),
+  ('Hell or High Water', 'Western', 2016, 8, 3),
+  ('The Good the Bad and the Ugly', 'Western', 1966, 9, 1),
+  ('Unforgiven', 'Western', 1992, 7, 2);
+
+SELECT film.title, director.name
+FROM new_films film
+JOIN directors director ON film.director_id = director.id;
+
+/* extension 3 */
+
+SELECT director.name, COUNT(*)
+FROM directors director
+JOIN new_films ON director.id = new_films.director_id
+GROUP BY name;