2010/3/8 svanderclock <svanderclock@...>

>
>
>
> I just discover something interesting :
>
> you can also use the build in function substr instead of aludf_copy it's the same result..
>
> if the declaration is
>
> DECLARE EXTERNAL FUNCTION substr

This is still an UDF, not a build in function ;)

avoid UDF when you can use build in function
in that case use SUBSTRING


cf http://www.firebirdsql.org/refdocs/langrefupd21-intfunc-substring.html