Re: Relation Schemata vs. Relation Variables

paul c wrote:
> Brian Selzer wrote:
> > "JOG" <jog_at_cs.nott.ac.uk> wrote in message
> > news:1156163752.697442.161770_at_i3g2000cwc.googlegroups.com...
> >> Brian Selzer wrote:
> >>> Identity beyond that provided by a candidate key (that is, a single
> >>> database
> >>> state) is in the eye of the beholder:
> >> Identity beyond that provided by the identifying keys is a nonsense. By
> >> not encoding it you have told the system it does not exist. If this is
> >> not true who is at fault?
> >>
> >
> > How do you tell the system that it does exist? ...
>
> Closed-world assumption.
>
Exactly. So if there is a correlation, then it must be stated as part of the update.
> p
Received on Tue Aug 22 2006 - 13:12:21 CEST