Louis-David Mitterrand <[EMAIL PROTECTED]> writes:
> critik=# select distinct pt.type_fr,sum(e2.id_event) from person_type
> pt natural join person_to_event join event e using (id_event) LEFT JOIN event
> e2 ON e.id_event = e2.id_event AND e2.id_event=219 join event_type et ON
> e.id_event_type = et.id_event_type where et.type_fr='théâtre' GROUP BY
> pt.type_fr IS NULL;
> gives this error:
> ERROR: column "pt.type_fr" must appear in the GROUP BY clause or be
> used in an aggregate function
> But pt.type_fr is _already_ in the group by.
No, "pt.type_fr IS NULL" is in the group by. That doesn't ensure that
each group has a unique value of pt.type_fr itself.
regards, tom lane
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