What are all the tracks?
select * from tracks
Which tracks are on the Movies Playlist?
select t1.name from tracks as t1 join playlist_tracks as t2 on t1.id = t2.track_id join playlists as t3 on t2.playlist_id = t3.id where t3.name = 'Movies'
Which tracks are not in the music playlist?
select t1.name from tracks as t1 join playlist_tracks as t2 on t1.id = t2.track_id join playlists as t3 on t2.playlist_id = t3.id where t3.name ! = 'Music'