Oracle FAQ Your Portal to the Oracle Knowledge Grid
HOME | ASK QUESTION | ADD INFO | SEARCH | E-MAIL US
 

Home -> Community -> Usenet -> comp.databases.theory -> Re: Relation Schemata vs. Relation Variables

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@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

> database state.




Here's where you're going wrong,  Brian.  A candidate key (from the logical
model) doesn't identify


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 - 07:20:54 CDT












Original text of this message













  HOME |
  ASK QUESTION |
  ADD INFO |
  SEARCH |
  E-MAIL US