Re: Counting propositions
Date: Mon, 14 Jun 2004 09:38:27 -0400
"x" <x-false_at_yahoo.com> wrote in message news:40cd9b6a_at_post.usenet.com...
> If tuples in a relational relation(ship) (or relvar) are propositions,
> is the meaning of :
> select count(distinct *) as nr
> from <relvar>
> and the like ?
Before dealing with your question, we have to decode the intent behind the wildcard.
In particular, when does the wildcard get expanded to the list of all the columns? At compile time? at execution time?
It makes a difference. Received on Mon Jun 14 2004 - 15:38:27 CEST