Re: On view updating
Date: 21 Sep 2004 04:12:57 -0700
Message-ID: <e4330f45.0409210312.3b1ec70b_at_posting.google.com>
"Peter Koch Larsen" <pklspam_at_mailme.dk> wrote in message news:<Vmb3d.50270$Vf.2438722_at_news000.worldonline.dk>...
> I do not agree. Remove the "AND ONLY IF", and we can talk.
Jan and Hegner say that this is the most common approach.
> Yes - the rules for view updates in the third maniphesto are downright
> awful.
They are not in the manifesto.
> Now I do not know what rules you are talking about.
About Date & McGoveran rules.
> A sensible DBMS should
> have no problem with the above deduction.
But a DBMS that uses that rules can not make the above deduction.
> Why not read some "real" database theory?
Because it does not solve the problem, and the Date & McGoveran's approach only needs some little adjustements to be very useful IMO.
> something about updates of views. You could also check the work of Stephen
> Hegner (http://www.cs.umu.se/~hegner/Publications/db.html).
I don't think that I can implement view updates with that.
Regards Received on Tue Sep 21 2004 - 13:12:57 CEST