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I study c++ builder help and I found Taggregate fields is support only by TClientDataset.
It would by nice to support this by zeos

I tried TZQuery with sql and with upadte object.
select id, type, count from table

Fields was created automatic and I created TAggregate field with expression Sum(count). I don't use grouping I want sum over full query.

But aggregate field doesn't do anything, it has null value for all time.

Does zeos support aggregate fields?