How to enforce referential integrity on Single Table Inheritance?

Question

I\'ve read some of Bill Karwin\'s answers about single table inheritance and think this approach would be good for the setup I am considering:

Playlist
--------
         


        

Answer 1

OK I see what you want here... what you want to do is run a query like

DELETE FROM playlist
WHERE       id 
NOT IN      (
    SELECT  id
    FROM    UserPlayList
    UNION
    SELECT  id
    FROM    TeamPlayList
)

after either a row is deleted from either users or teams