Date: Tue, 08 Jul 2008 14:58:35 GMT
Brian Selzer wrote:
> "paul c" <toledobysea_at_ac.ooyah> wrote in message ...
>> However, I'm content to say that all three relations have the same
>> predicate, assuming no attribute renaming is involved in your
>> interpretation. I know many people say that the 'or' is introduced to the
>> predicate of R. I don't believe there is any law or principle, including
>> relational closure, that requires anybody to think this way.
> > How can they have the same predicate if they can have different extensions? > That doesn't make any sense. > ...
They are misconceived. The example strikes me as akin to Joe C's word games. Received on Tue Jul 08 2008 - 16:58:35 CEST