Helen,

> > > Correct. Value + NULL evaluates to false.
> >
> >As a matter of fact, Value + NULL evaluates to NULL.
> >I guess you meant that.
>
> No, I meant what I said.

Would you care to elaborate, then?

If I issue

select 100 + cast(NULL as integer) from rdb$database

I get NULL as a result.
Ciao
--
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_/\/ando