Re: Funny date-sorting task

From: Frank Bax <fbax(at)sympatico(dot)ca>
To: pgsql-sql(at)postgresql(dot)org
Subject: Re: Funny date-sorting task
Date: 2007-05-13 03:13:50
Message-ID: 5.2.1.1.0.20070512231137.042f88d0@pop6.sympatico.ca
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At 07:40 PM 5/12/07, Andreas wrote:
>I've got a stack of tasks to show in a list.
>Every task has a timestamp X that may be NULL or a date. It contains the
>date when this tasks should be done.
>Sometimes it has date and the time-part, too.
>
>
>The list should be like this:
>1) X sometime today should come first in ascending time order.
>2) X in the past should show up after (1) in descending order so that
>not so long back dates come first
>3) X = NULL
>4) X sometime in the future
>
>Could you provide a clever solution?

ORDER BY CASE WHEN X=today THEN 1 ELSE
CASE WHEN X<today THEN 2 ELSE
CASE WHEN X IS NULL THEN 3 ELSE
CASE WHEN X>today THEN 4 ELSE 5 END END END END

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