Hans Eivind Skinstad

CREATE TABLE and INSERT.txt

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+CREATE TABLE films (
+id SERIAL NOT NULL,
+title VARCHAR(120) UNIQUE NOT NULL,
+genre VARCHAR(40),
+release_year INT,
+score INT,
+PRIMARY KEY (id)
+);
+
+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);

Exercise - SELECT queries.txt

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+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 > 1990
+AND release_year < 2000;
+
+SELECT *
+FROM films
+WHERE genre = 'SciFi';
+
+SELECT *
+FROM films
+WHERE genre = 'Western'
+OR genre = 'SciFi';
+
+SELECT *
+FROM films
+WHERE genre != 'SciFi';
+
+SELECT *
+FROM films
+WHERE genre = 'Western'
+AND release_year < 2000;
+
+SELECT *
+FROM films
+WHERE title LIKE '%Matrix%';

Extension 1.txt

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+SELECT AVG(score)
+FROM films;
+
+SELECT COUNT(id)
+FROM films;
+
+SELECT genre, AVG(score)
+FROM films
+GROUP BY genre;

Extension 2.txt

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+CREATE TABLE directors (
+id SERIAL NOT NULL,
+name VARCHAR(120),
+PRIMARY KEY (id)
+);
+
+CREATE TABLE films (
+id SERIAL NOT NULL,
+title VARCHAR(120) UNIQUE NOT NULL,
+genre VARCHAR(40),
+release_year INT,
+score INT,
+director_id SERIAL,
+PRIMARY KEY (id),
+FOREIGN KEY(director_id) REFERENCES directors(id)
+);
+
+INSERT INTO directors(name)
+VALUES
+('Johnny John Johnson'),
+('Luke Star-Man'),
+('Christopher Nolan'),
+('Willy Western'),
+('Sergio Leone');
+
+INSERT INTO films (title, genre, release_year, score, director_id)
+VALUES
+('The Shawshank Redemption', 'Drama', 1994, 9, 3),
+('The Godfather', 'Crime', 1972, 9, 3),
+('The Dark Knight', 'Action', 2008, 9, 3),
+('Alien', 'SciFi', 1979, 9, 1),
+('Total Recall', 'SciFi', 1990, 8, 2),
+('The Matrix', 'SciFi', 1999, 8, 2),
+('The Matrix Resurrections', 'SciFi', 2021, 5, 2),
+('The Matrix Reloaded', 'SciFi', 2003, 6, 1),
+('The Hunt for Red October', 'Thriller', 1990, 7, 1),
+('Misery', 'Thriller', 1990, 7, 3),
+('The Power Of The Dog', 'Western', 2021, 6, 5),
+('Hell or High Water', 'Western', 2016, 8, 5),
+('The Good the Bad and the Ugly', 'Western', 1966, 9, 4),
+('Unforgiven', 'Western', 1992, 7, 5);
+
+
+
+SELECT title, directors.name
+FROM films
+JOIN directors
+ON films.director_id = directors.id;

Extension 3.txt

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+SELECT directors.name, COUNT(films)
+FROM films
+INNER JOIN directors
+ON films.director_id = directors.id
+GROUP BY directors.id
+ORDER BY COUNT(films) DESC;