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Re: BUG #1555: bug in GROUP BY?

From: Michael Fuhr <mike(at)fuhr(dot)org>
To: Peter Cottingham <cottingh(at)rci(dot)rutgers(dot)edu>
Cc: pgsql-bugs(at)postgresql(dot)org
Subject: Re: BUG #1555: bug in GROUP BY?
Date: 2005-03-27 06:22:49
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-bugs
On Mon, Mar 21, 2005 at 07:20:04PM +0000, Peter Cottingham wrote:
> Appears that the GROUP BY clause is not working correctly on new server
> (GROUP BY should order the result set in ASCENDING order, NOT DESCENDING 
> order.)  See below
> **********************************
> select dom_id, count(ste_id) as ste_count
> from ste
> group by dom_id
> **********************************

As far as I know, the SQL standards don't specify that GROUP BY is
supposed to give a particular order.  A query without an ORDER BY
clause, or a query with an ORDER BY clause that isn't specific
enough, has an order that's implementation-dependent.  If you want
a particular order then use ORDER BY.

Somebody please correct me if I'm mistaken (with a relevant citation
from one of the standards).

Michael Fuhr

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