Re: Counting propositions
Date: Tue, 15 Jun 2004 10:01:07 +0300
"Paul G. Brown" <paul_geoffrey_brown_at_yahoo.com> wrote in message
> "x" <x-false_at_yahoo.com> wrote in message
> > **** Post for FREE via your newsreader 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 ?
> Given that all relvars have a key, and assuming that your '*' is a
> macro that expands to 'all attributes' (don't matter what phase of
> query processing), then nr is going to equal the number of tuples in
> the relvar.
Ok. But why there is a need to know this number ?
It is like saying "today I made 100 affirmations".