Bruno Wolff III <bruno(at)wolff(dot)to> writes:
> On Wed, Aug 20, 2003 at 13:44:59 -0500,
> Ron Johnson <ron(dot)l(dot)johnson(at)cox(dot)net> wrote:
>> The GROUP BY does implicit sorting, so an ORDER BY on the exact same
>> column(s) as the GROUP BY is redundant.
> That is an implementation detail, not a promise. With hashed aggregates
> in 7.4, you might find this isn't true.
s/might/will/
regards, tom lane