Delete from cinemas where .... cascade;
Ermina Chatzipavli <echatzip_at_filmnet.gr> wrote in message
news:380715CA.19F3EE0C_at_filmnet.gr...
> Dear all,
>
> I have the following question:
>
> One table contains cinemas (cinema_id, .......), another one movies
> (movie_id,....) and the third one foreign keys (cinema_id, movie_id),
> since we have a many to many relationship (one cinema may play several
> movies, and one movie can be played in several cinemas as well).
>
> Now, I want to be able to delete all the records from the first or the
> second table but an error appears: integrity constraint violated -
> child record found. Is there a way to be able to delete a cinema or a
> movie and have all the related records in the third table deleted as
> well?
>
> I know there are some delete rules (cascade, restrict) but I don't know
> how to use them. (I only used them when I created my database schema in
> ERwin).
>
> Thank you in advance,
>
> Ermina
>
Received on Fri Oct 15 1999 - 17:45:53 CDT
