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Date: Tue, 15 Feb 2005 22:47:35 -0600
From: Bruno Wolff III <bruno@wolff.to>
To: Andreas Joseph Krogh <andreak@officenet.no>
Cc: pgsql-sql@postgresql.org
Subject: Re: Making NULL entries appear first when ORDER BY <field> ASC
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> 
> Now, as you see, touples with NULL in the "start_time"-field appear "after" 
> the others. I would like to make all entries where start_time IS NULL apear 
> *before* all the others. Any idea how to achieve this?

SELECT start_date, start_time, end_time, title
FROM onp_crm_activity_log
WHERE start_date IS NOT NULL
ORDER BY start_date ASC, start_time IS NOT NULL ASC, start_time ASC;

This assumes you want the NULL start times first within a particular
date. Otherwise change the order in the ORDER BY clause.