Re: object algebra

"Neo" <neo55592_at_hotmail.com> wrote in message news:4b45d3ad.0402282152.752f366_at_posting.google.com...
> > > Given EyeColor = {red, brown, N/A} and the table:
> > > Person EyeColor
> > > ------ --------
> > > John N/A
> > > Mary N/A
> > >
> > > A query to find persons with equal eyeColor returns: John & Mary.
> >
> > ... it darn well better return John and Mary,
> > because they fit that description.
>
> True it matches what RDM says the answer should be.
> The problem is, the answer doesn't match reality.

How come it's John and not Bob anymore? Did Bob get a transplant?

And anyway, in reality, two people with no eyes are two people whose eyes are all the same color. In Reality. Not just in some model. In Reality. They have no pair of eyes with a different color: all zero of their eyes match.

If you think otherwise, you don't understand reality.

Marshall Received on Sun Feb 29 2004 - 08:46:41 CET