Re: Plural or singular table names

"Paul Vernon" <paul.vernon_at_ukk.ibmm.comm> wrote in message news:bj2mh2$fri$1_at_gazette.almaden.ibm.com...
> Summarising..
>
> "Bob Badour" <bbadour_at_golden.net> wrote in message
> news:RN35b.377$hL1.39717997_at_mantis.golden.net...
>
> > > Therefore I say the that the tuple type itself should be (a reasonable
> > > approximation) for the predicate.
> >
> > I agree.
>
> Good.
>
> Further, if it is a good enough approximation, then we don't need to be
overly
> concerned with the external predicate.
>
>
> BTW Could you show me how a constraint alters the meaning of a set of
tuples? For
> me, a constraint alters the allowable set of meanings, it does not alter
the meaning
> of a particular set of tuples.

Constraints identify the meaningful set of possible statements.

Consider the following relation:

F:

X Y Z
= = -
2 2 4

Do the following constraints give F different meanings?

Z = X + Y
Z = X * Y
Z = X ^ Y