Richard Huxton schrieb:
> Search the mailing-list archives for "custom aggregate concat" and
> you'll quickly find an example of how to write your own custom aggregate
> (like SUM()).
>
> Warning - I don't think you can guarantee the order of elements in the
> aggregated sectors.
Thank you very much. This was the right hint where to search. For the
order I'll try to find some possibilities to write a function, that does
a sort on this ;) We'll see...
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