| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | Gregory Stark <stark(at)enterprisedb(dot)com> |
| Cc: | "A(dot) Kretschmer" <andreas(dot)kretschmer(at)schollglas(dot)com>, pgsql-sql(at)postgresql(dot)org |
| Subject: | Re: Sql ORDER BY and ASC/DESC question |
| Date: | 2008-01-30 18:00:29 |
| Message-ID: | 14687.1201716029@sss.pgh.pa.us |
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| Lists: | pgsql-sql |
Gregory Stark <stark(at)enterprisedb(dot)com> writes:
> If you're not concerned with the planner being able to find indexes to satisfy
> these orderings (ie, you don't mind always doing a sort) you could do
> something like:
> ORDER BY
> CASE ?
> WHEN 1 THEN name ASC
> WHEN 2 THEN name DESC
> WHEN 3 THEN height ASC
> WHEN 4 THEN height DESC
> ELSE id ASC
> END
Uh, no, putting the ASC/DESC decoration inside a CASE like that is not
gonna work --- it's only allowed at the top level of an ORDER BY clause.
For numerical sort keys you can cheat by using "-x" in place of
"x DESC", but I'm not aware of any equivalent hack for text keys.
regards, tom lane
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