From: Tom Lane <tgl@sss.pgh.pa.us>
To: David Witham <davidw@unidial.com.au>
Cc: pgsql-sql@postgresql.org
Subject: Re: Sorting an aggregated column
Date: Tue, 23 Mar 2004 00:17:24 -0500
Message-ID: <15732.1080019044@sss.pgh.pa.us> (raw)
In-Reply-To: <CFA248776934FD43847E740E43C346D199DCAA@ozimelb03.ozicom.com>
References: <CFA248776934FD43847E740E43C346D199DCAA@ozimelb03.ozicom.com>
"David Witham" <davidw@unidial.com.au> writes:
> This output is correct in this case but there is no guarantee that the
> answers will come out in "question" order. I can't see how to
> incorporate sorting by the "question" column using this approach.
As of PG 7.4 you can reliably use a sorted sub-select to determine the
order of inputs to a user-defined aggregate function. See for instance
http://archives.postgresql.org/pgsql-general/2003-02/msg00917.php
regards, tom lane
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To: pgsql-sql@postgresql.org
Cc: tgl@sss.pgh.pa.us, davidw@unidial.com.au
Subject: Re: Sorting an aggregated column
In-Reply-To: <15732.1080019044@sss.pgh.pa.us>
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