--- In firebird-support@yahoogroups.com, Paul Vinkenoog <paul@...> wrote:

> Are you absolutely sure it returns false (or null)?
>
> If so, please let us now your exact Firebird version (number, lassic
> or Superserver, OS) and the complete SQL context (that is, the ntire
> if... then... begin... end code).

I could not reproduce this on simple example, probably this can be my
mistake somewhere.

> And as others said, use COALESCE.

Who created this strange name for this function? Since this function
appeared in FB, every time when I want to use it, I have to look
somewhere to find how to write it :)