> See my posting yesterday in response to Raymond Kennington's

thread

> "Foreign keys and low selectivity".
>
> Also (when the Atkin server comes back to life) search the

archives on the

> word "selectivity".
>
> As for referential integrity, it is perfectly possible to manage

this

> yourself with triggers. I don't have time to "write the manual"

for you

> but trying searching the net for articles about the concept - it's

a

> structural issue rather than one that's database-specific. See

also CREATE

> EXCEPTION, a handy tool in writing RI triggers...

Understood, and will do.
Sorry, I just panicked when I read your post.
-Ryan