Re: relationship in the database

From: Peter Koch Larsen <pkl_at_mailme.dk>
Date: Thu, 26 Sep 2002 20:50:41 +0200
Message-ID: <3d935701$0$18143$edfadb0f@dspool01.news.tele.dk>

"Paul Vernon" <paul.vernon_at_ukk.ibmm.comm> skrev i en meddelelse news:amvj25$c3s$1_at_sp15at20.hursley.ibm.com...
> >Perhaps the model is not bad, but just incomplete? My
> >understanding from reading TTM just is that this is not the
> >case. I see no place for UPDATE there, and do so in the basis
> >of a quote on page 165 (second edition): [Relational]
> > "assignments are fundamentally the only means by which a relvar
> > can be updated".

The quote was from page 166, actually. It was the prescription that was on page 165.

>
> TTM is a book to read carefully. Just two pages on from that quote they
> explain how UPDATE is supported.

Yes - but not in the sense of an SQL update. The key is not changed.

>
>
> BTW, I think our philosophies match quite well
>
> :-)
>
> Regards
> Paul Vernon
> Business Intelligence, IBM Global Services
>
Received on Thu Sep 26 2002 - 13:50:41 CDT