Jim,

>>I think of it as a de-nullified '=' operator.

J> That really a very negative attitude!

If I had a denullifying spray I'd spread it all over my databases.
Having a way to represent missing or unknown values is one thing,
three-state boolean algebra is a different matter. Ah, those
committees...

Ciao
--
Nando Dessena
mailto:nandod@...