Mattias Hedbom

CoreAndExtensionExercises.sql

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+// Setup
+
+CREATE TABLE films(
+	id serial primary key,
+  title TEXT,
+  genre TEXT,
+  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)
+
+
+
+
+
+
+
+
+// CORE EXERCISE
+
+// All films
+SELECT * FROM films;
+
+
+// All films ordered by rating descending
+SELECT * FROM films
+ORDER BY score desc;
+
+
+// All films ordered by release year ascending
+SELECT * FROM films
+ORDER BY release_year asc;
+
+
+// All films with a rating of 8 or higher
+SELECT * FROM films
+WHERE score >= 8;
+
+
+// All films with a rating of 7 or lower
+SELECT * FROM films
+WHERE score <= 7;
+
+
+// films released in 1990
+SELECT * FROM films
+WHERE release_year = 1990;
+
+
+// films released before 2000
+SELECT * FROM films
+WHERE release_year < 2000;
+
+
+// films released after 1990
+SELECT * FROM films
+WHERE release_year > 1990;
+
+
+// films released between 1990 and 1999
+SELECT * FROM films
+WHERE release_year BETWEEN 1990 AND 1999;
+
+
+// films with the genre of "SciFi"
+SELECT * FROM films
+WHERE genre = 'SciFi';
+
+
+// films with the genre of "Western" or "SciFi"
+SELECT * FROM films
+WHERE genre = 'SciFi' OR genre = 'Western';
+
+
+// films with any genre apart from "SciFi"
+SELECT * FROM films
+WHERE genre != 'SciFi';
+
+
+// films with the genre of "Western" released before 2000
+SELECT * FROM films
+WHERE genre = 'Western'
+AND release_year < 2000;
+
+
+// films that have the world "Matrix" in their title
+SELECT * FROM films
+WHERE title like '%Matrix%';
+
+
+
+
+
+
+
+
+// EXTENSION EXERCISES
+
+// EXTENSION 1
+// Return the average film rating
+SELECT AVG(score) AS average_score FROM films
+
+
+// Return the total number of films
+SELECT COUNT(id) AS number_of_films FROM films
+
+
+// Return the average film rating by genre
+SELECT AVG(score) AS average_score, genre FROM films
+GROUP BY genre
+
+
+
+
+
+
+
+
+// EXTENSION 2
+CREATE TABLE directors(
+	id SERIAL PRIMARY KEY,
+  name TEXT
+)
+
+INSERT INTO directors
+	(name)
+VALUES
+	('Christopher Nolan'),
+  ('Quentin Tarantino'),
+  ('Josef Fares'),
+  ('Steven Spielberg'),
+  ('Alfred Hitchcock'),
+  ('Woody Allen'),
+  ('Clint Eastwood'),
+  ('David Fincher'),
+  ('Ridley Scott'),
+  ('Danny Boyle')
+
+
+CREATE TABLE films(
+	id SERIAL PRIMARY KEY,
+  directorId int,
+  title TEXT,
+  genre TEXT,
+  release_year INTEGER,
+  score INTEGER,
+  UNIQUE(title),
+  FOREIGN KEY (directorId) REFERENCES directors(id)
+);
+
+
+INSERT INTO films
+	(directorid, title, genre, release_year, score)
+VALUES
+	(1, 'The Shawshank Redemption', 'Drama', 1994, 9),
+  (1, 'The Godfather', 'Crime', 1972, 9),
+  (1, 'The Dark Knight', 'Action', 2008, 9),
+  (2, 'Alien', 'SciFi', 1979, 9),
+  (2, 'Total Recall', 'SciFi', 1990, 8),
+  (3, 'The Matrix', 'SciFi', 1999, 8),
+  (4, 'The Matrix Resurrections', 'SciFi', 2021, 5),
+  (5, 'The Matrix Reloaded', 'SciFi', 2003, 6),
+  (6, 'The Hunt for Red October', 'Thriller', 1990, 7),
+  (7, 'Misery', 'Thriller', 1990, 7),
+  (8, 'The Power Of The Dog', 'Western', 2021, 6),
+  (9, 'Hell or High Water', 'Western', 2016, 8),
+  (10, 'The Good the Bad and the Ugly', 'Western', 1966, 9),
+  (10, 'Unforgiven', 'Western', 1992, 7)
+
+
+// Using an SQL JOIN, write a SELECT statement that returns a list of films with their director.
+SELECT * FROM films
+	join directors on directors.id = films.directorid;
+
+
+
+
+
+
+
+
+// EXTENSION 3
+// Write a SQL SELECT statement that returns a lists of directors along with the number of films they have directed.
+
+SELECT COUNT(films.directorId) AS Number_of_directed_films, directors.name FROM films
+	JOIN directors on directors.id = films.directorid
+  GROUP BY directors.name
+  ORDER BY COUNT(films.id) desc
+