Re: Counting propositions
Date: Tue, 15 Jun 2004 16:32:33 +0300
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"Paul Vernon" <paul.vernon_at_ukk.ibmm.comm> wrote in message news:camrsd$1cd0$1_at_gazette.almaden.ibm.com...
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> > > > "Paul G. Brown" <paul_geoffrey_brown_at_yahoo.com> wrote in message
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> > > > > Given that all relvars have a key, and assuming that your '*' is
> > > > > macro that expands to 'all attributes' (don't matter what phase of
> > > > > query processing), then nr is going to equal the number of tuples
> > > > > 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?
> > Employees yes. Propositions no.
> > But in a relational database, all you have are propositions. There is > nothing else there that counts.
Tough situation, don't you think ?
How you derive the number of employees from the number of propositions involving employees ?
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