From: Stephan Szabo <sszabo@megazone23.bigpanda.com>
To: Rajesh Kumar Mallah <mallah@trade-india.com>
Cc: Tomasz Myrta <jasiek@klaster.net>
Cc: pgsql-sql@postgresql.org
Subject: Re: sql question regarding count(*)
Date: Thu, 6 Mar 2003 22:11:03 -0800 (PST)
Message-ID: <20030306220603.P87448-100000@megazone23.bigpanda.com> (raw)
In-Reply-To: <200303071053.06820.mallah@trade-india.com>
On Fri, 7 Mar 2003, Rajesh Kumar Mallah wrote:
> Tomasz did you notice the two queries are totally differet on different
> tables?
A count() on a non-grouped table returns 1 row.
A grouped table returns 1 row per group. If there are no groups, no rows
are returned. If the groups are filtered by a having clause, it might
also return no rows.
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To: pgsql-sql@postgresql.org
Cc: sszabo@megazone23.bigpanda.com, mallah@trade-india.com, jasiek@klaster.net
Subject: Re: sql question regarding count(*)
In-Reply-To: <20030306220603.P87448-100000@megazone23.bigpanda.com>
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