André Velkov Janusev

sql/products/create-products.sql

@@ -4,5 +4,4 @@ CREATE TABLE products(
  price int not null,
  discount boolean,
  unique(name)
-)
-
+)

sql/products/exercise-sql-intro.sql

@@ -0,0 +1,123 @@
+--
+--Exercise Core
+--
+
+--CREATE
+CREATE TABLE films(
+id serial primary key,
+title varchar(255) not null,
+genre varchar(255) not null,
+releaseYear integer not null,
+rating integer,
+director integer
+)
+
+--INSERT
+INSERT INTO films (title, genre, releaseYear, rating)
+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 STATEMENTS
+--All films
+SELECT * from films;
+
+--* All films ordered by rating descending
+SELECT * from films ORDER BY rating DESC;
+
+--* All films ordered by release year ascending
+SELECT * from films ORDER BY releaseYear ASC;
+
+--* All films with a rating of 8 or higher
+SELECT * from films WHERE rating >= 8;
+
+--* All films with a rating of 7 or lower
+SELECT * from films WHERE rating <= 7;
+
+--* films released in 1990
+SELECT * from films WHERE releaseYear = 1990;
+
+--* films released before 2000
+SELECT * from films WHERE releaseYear < 2000;
+
+--* films released after 1990
+SELECT * from films WHERE releaseYear > 1990;
+
+--* films released between 1990 and 1999
+SELECT * from films WHERE releaseYear >= 1990 and releaseYear <= 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 NOT genre = "SciFi";
+
+--* films with the genre of "Western" released before 2000
+SELECT * from films WHERE genre = "Western" AND releaseYear < 2000;
+
+--* films that have the world "Matrix" in their title
+SELECT * from films WHERE title LIKE '%Matrix%';
+
+--
+-- Exercise Extensions
+--
+
+--
+-- Extension 1
+--* Return the average film rating
+SELECT AVG(rating) from films;
+--* Return the total number of films
+SELECT count(*) from films;
+--* Return the average film rating by genre
+SELECT avg(rating), genre from films group by genre;
+
+--
+-- Extension 2
+CREATE TABLE directors(
+id integer primary key autoincrement,
+name varchar(255),
+)
+
+insert into directors (name)
+values ('Steven Spielberg'), ('Christopher Nolan'), ('Quentin Tarantino');
+
+CREATE TABLE films(
+id SERIAL PRIMARY KEY ,
+title varchar(255) not null,
+genre varchar(255) not null,
+releaseYear integer not null,
+rating integer,
+director integer,
+foreign key (director) references directors(id)
+)
+
+--INSERT
+INSERT INTO films (title, genre, releaseYear, rating, director)
+VALUES ('The Shawshank Redemption', 'Drama', 1994, 9, 1),
+       ('The Godfather', 'Crime', 1972, 9, 2),
+       ('The Dark Knight', 'Action', 2008, 9, 2),
+       ('Alien', 'SciFi', 1979, 9, 3);
+
+--* Using and SQL JOIN, write a SELECT statement that returns a list of films with their director
+SELECT * from films join directors on directors.id = films.director;
+
+--
+-- Extension 3
+SELECT count(*), directors.name
+from films2
+join directors on directors.id = films2.director
+group by directors.name;