Re: SUPPORT FOR DECLARATIVE TRANSITION CONSTRAINTS

On 21 sep, 04:47, Brian <br..._at_selzer-software.com> wrote:

> I can't see how it does.

See my other reply.

> Since it is obvious that
> keys cannot be relied upon to provide that precise determination,

I would have hoped it was equally obvious to anyone that nor can objectid's, or whatever other kind of meaningless identifying construct one wishes to use.

After all, wasn't it you who suggested that Codd wrote that even 'regular' keys are really just surrogates just like any other kind of identifier ? And shouldn't that be sufficient to prove that any other kind of identifier would suffer from exactly the same "deficiencies" as regular keys do, when it comes to enforcing transition constraints in the situations you complain about ? Received on Tue Sep 21 2010 - 19:02:41 CEST