Re: Grouping by date range - Mailing list pgsql-general

On Wed, Aug 20, 2003 at 13:44:59 -0500,
  Ron Johnson <ron.l.johnson@cox.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.