Holly Giang | SQL

music.sql

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+/* CREATE A MUSIC DATABASE */
+
+CREATE TABLE album (
+    id INTEGER PRIMARY KEY AUTOINCREMENT,
+    title VARCHAR(128) NOT NULL,
+    release_year INTEGER
+);
+
+CREATE TABLE artist (
+    id INTEGER PRIMARY KEY AUTOINCREMENT,
+    name VARCHAR(128) NOT NULL
+);
+
+CREATE TABLE track (
+    id INTEGER PRIMARY KEY AUTOINCREMENT,
+    title VARCHAR(128) NOT NULL,
+    album_id INT REFERENCES album(id)
+);
+
+CREATE TABLE artist_album (
+    artist_id INT REFERENCES artist(id),
+    album_id INT REFERENCES album(id) 
+);
+
+/* Show all albums */
+
+ SELECT * from album;
+
+--- 1|Super Awesome Album|1990
+--- 2|Super Funky Album|
+--- 3|Super Disco Album|1978
+--- 4|Super Hairband Album|1984
+--- 5|Super Dubstep Album|
+
+/* Show all albums made between 1975 and 1990 */
+
+SELECT * from album WHERE release_year > 1975 AND release_year < 1990;
+
+--- 3|Super Disco Album|1978
+--- 4|Super Hairband Album|1984 /*
+
+/* Show all albums whose names start with `Super D` */
+
+SELECT * from album WHERE title LIKE 'Super D%';
+
+--- 3|Super Disco Album|1978
+--- 5|Super Dubstep Album|
+
+/* Show all albums that have no release year */
+
+SELECT * from album WHERE release_year IS NULL;
+
+--- 2|Super Funky Album|
+--- 5|Super Dubstep Album|
+
+/* Show all track titles from `Super Funky Album` */
+
+SELECT track.title FROM track, album WHERE track.album_id = album.id AND album.title = 'Super Funky Album';
+
+--- Super Funky Track 1
+--- Super Funky Track 2
+--- Super Funky Track 3
+--- Super Funky Track 4
+
+/* Select all album titles by `Han Solo` */
+
+SELECT album.title from artist, album, artist_album WHERE artist.id = artist_album.artist_id AND artist_album.album_id = album.id AND artist.name = 'Han Solo'; 
+
+--- Super Disco Album
+--- Super Hairband Album
+
+/* Select the average year all albums were released */ 
+
+SELECT AVG(release_year) FROM album;
+
+--- 1984.0
+
+/* Select the average year all albums by `Leia and the Ewoks` were released */
+
+SELECT AVG(release_year) FROM album, artist, artist_album WHERE artist.id = artist_album.artist_id AND album_id = artist_album.album_id AND artist.name = 'Leia and the Ewoks';
+
+--- 1990.0 
+
+/* Select the number of artists */
+
+SELECT COUNT(id) from artist;
+
+--- 3 
+
+/* Select the number of tracks on `Super Dubstep Album` */
+
+SELECT COUNT(track.id) FROM track, album WHERE album.id = track.album_id and album.title = 'Super Dubstep Album';
+
+--- 5