Markus,

> thanks for the suggestions. But BREAK and FIRST are both only availabe
> from FB 1.0 and upper. And some of my customers don't have the latest
> FB version.

then you can follow Helen's suggestion, which if I'm not mistaken should
work for every version of IB.
Just make sure you can afford the extra fetches (ie the result set is
not too big).
Ciao
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_/\/ando