I've never done this myself, but since no-one has answered you:

There is a function strlen that is part of the IB_UDF library, which I
think should find the length up to 32767 characters.

HTH,
Set

--- In firebird-support@yahoogroups.com, "roro669" wrote:
> Hello friends,
>
> My question is :
>
> there is some way to determine the length of string
> greater than 256 characters.
>
>
> Best Regards