Re: Relation Schemata vs. Relation Variables
From: David Cressey <dcressey_at_verizon.net>
Date: Thu, 24 Aug 2006 12:20:54 GMT
Message-ID: <GQgHg.11721$Vo.5463_at_trndny09>
Date: Thu, 24 Aug 2006 12:20:54 GMT
Message-ID: <GQgHg.11721$Vo.5463_at_trndny09>
<brian_at_selzer-software.com> wrote in message
news:1156344427.551602.122270_at_h48g2000cwc.googlegroups.com...
> A candidate key value can only identify a tuple within a single
Here's where you're going wrong, Brian. A candidate key (from the logical
model) doesn't identify
> database state.
a tuple. Not even within a single database state.
One might say that it specifies a tuple. That isn't the same thing as identifying the tuple. Received on Thu Aug 24 2006 - 14:20:54 CEST