Left outer join
eSymphony's marketing department has noticed that songs in playlists get purchased more often. Since there's a Led Zeppelin anniversary coming up, they want to know how many songs composed by Jimmy Page, the founder of the band, are not in a playlist yet.
You decide to use a left outer join to solve this problem. By doing this, you are sure all tracks, even the ones that aren't included in a playlist, are shown.
Deze oefening maakt deel uit van de cursus
Introduction to Oracle SQL
Praktische interactieve oefening
Probeer deze oefening eens door deze voorbeeldcode in te vullen.
SELECT t.TrackId, t.Composer, t.Name, p.PlaylistId
-- Perform a left outer join
FROM ___ ___ ___ ___ JOIN ___ p
-- Match on track id
ON ___.___ = ___.___