Re: Counting propositions

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"Tony" <andrewst_at_onetel.net.uk> wrote in message news:c0e3f26e.0406180226.5b4153a0_at_posting.google.com...

> > You see, there might be a relational database that has no named
> > relation/relvar that (directly) assert employment.
>
> A badly designed, and probably un-normalised, database I would suggest
> ;-)

Well, you cannot always choose the design :-) Why unnormalized ?

> > It works only when you count Emp_IDs, not the propositions employing
Emp_IDs
> > :-)
>
> No, it always works when you count propositions whose intention is to
> state the existence of an employee. Of course it doesn't work if you
> count propositions about project assignment or the employees' CD
> collections etc.!

In order to count propositions whose intention is to state the existence of an employee, you rely on Emp_IDs one-to-one corespondence with the employees, so you really count those Emp_IDs. :-)

> But, for every table, "select count(*)" provides useful information -
> provided you understand what the table means.

I just showed you that you don't need to count the propositions for counting the employees. :-)
You only need to count the Emp_IDs ... :-)

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