"x" <x-false_at_yahoo.com> wrote in message news:<40ce9db7_at_post.usenet.com>...
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> "Paul G. Brown" <paul_geoffrey_brown_at_yahoo.com> wrote in message
> news:57da7b56.0406141517.9cb7b7d_at_posting.google.com...
> > 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".
Have you never wanted to know how many of something you had? Can you
not envisage a large business wanting to know, for example, how many
employees it has?
Received on Tue Jun 15 2004 - 05:22:18 CDT
