--- In firebird-support@yahoogroups.com, Helen Borrie <helebor@t...>
wrote:

>
> >What I wan't to do is extracting PKs from a string
> >which is delivered by my app.
>
> If you're using Firebird, don't use a UDF for substring, use the
> SUBSTRING() internal function.

Where can I find information about such functions?
I'm still using 'IB 6 Language Reference' and there this
function is not mentioned.

Regards

Jürgen