Re: 3vl 2vl and NULL

"JOG" <jog_at_cs.nott.ac.uk> wrote in message news:1133743014.449157.280020_at_f14g2000cwb.googlegroups.com...
>
> Roy Hann wrote:
> [snip]
> > If you have a Boolean variable then you know that its missing value must
be
> > drawn from only the Boolean domain. The appropriate way to think of the
> > missing information is therefore not as an empty set, but as something
that
> > is simultaneously all possible values from the Boolean domain. The
Boolean
> > variable thus might be T, F, or T/F (where T/F is a kind of
superposition of
> > all permissible Boolean values).
> [/snip]
>
> I wonder if you are heading for a more probabilistic approach here?

It's not what I had in mind, and I can't say I've encountered the need for that in my day job. I just wanted to object to the idea that an empty set is a better way of representing null.

It is more is obviously wrong than a null indicator, and knowing more certainly that something is wrong is progress! :-)

Roy Received on Mon Dec 05 2005 - 09:55:46 CET