On 02/06/2004 03:07:41 PM, Wolfgang Breitling wrote:
> NULL is NULL. It is not equal anything and it is not unequal
> anything.
> It
> is just NULL
>

Actually, I've noticed that many people have problems with
ternary logic, where condition can be false, true and null.
I'd put every relational database designer thru a course
of the Zermelo-Frankel set theory. I know that relational
databases are based on naive set theory (Cantor's theory)
but Z-F with "axiom of choice" would teach them to excercise
unusual way of thinking. It would very interesting to see the
results and reactions.....
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