Re: Relation Schemata vs. Relation Variables
From: paul c <toledobythesea_at_oohay.ac>
Date: Mon, 21 Aug 2006 17:28:36 GMT
Message-ID: <83mGg.433655$Mn5.393293_at_pd7tw3no>
Date: Mon, 21 Aug 2006 17:28:36 GMT
Message-ID: <83mGg.433655$Mn5.393293_at_pd7tw3no>
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.
p Received on Mon Aug 21 2006 - 19:28:36 CEST