>
>
> Is there a way to tell that a certain parameter passed to an UDF
> function is null?
>
> I need a function like NVL(<field>, <value>) which will return
> <value> if <field> is null and <field> itself if it isn't null...
>
> -- Dimitar
>
>

Hi
Here is a function I use in Delphi to check for null

procedure CheckVariables(var RF,WF:Integer);
begin
if VarIsNull(RF) then
RF:=0;
if VarIsNull(WF) then
WF:=0;
end;

Groete
Gerhardus