--- In firebird-support@yahoogroups.com, Lucas Franzen <luc@...> wrote:

> So your conclusion is that we both have the same amount of money in
> our wallets, since we both have NULL....

How do you know that we have not equal amount? :) In this case
exception would be logical way to react to such situation. False - is
also answer, I had to swap statements of "then" and "else".