>
> I have read in the release notes, but i can't find the way to use it in
> documentation.

It is not in the documentation (or rather, the release notes are the
documentation).

Here is an example:

select substring(first_name from 1 for 1) as "Initial", last_name
from employee;


Paul
--

Paul Reeves
http://www.ibphoenix.com
Supporting users of Firebird and InterBase