Re: ID field as logical address
From: Walter Mitty <wamitty_at_verizon.net>
Date: Wed, 03 Jun 2009 15:23:29 GMT
Message-ID: <RzwVl.15$tr5.10_at_nwrddc02.gnilink.net>
Date: Wed, 03 Jun 2009 15:23:29 GMT
Message-ID: <RzwVl.15$tr5.10_at_nwrddc02.gnilink.net>
"Brian Selzer" <brian_at_selzer-software.com> wrote in message
news:2zuVl.25052$as4.10008_at_nlpi069.nbdc.sbc.com...
> I disagree. It is my contention that each tuple in a database--regardless
> of whether it is in a base or a derived relation--maps to some thing in
> the Universe of Discourse but no two tuples in the same database map to
> exactly the same thing. When presented with a proposed database, there
> must be some mechanism to correlate the things that each tuple in the
> current database maps to with the things that each tuple in the proposed
> database maps to.
Why? Received on Wed Jun 03 2009 - 17:23:29 CEST