From: Andreas Kretschmer <akretschmer@spamfence.net>
To: pgsql-sql@postgresql.org
Subject: Re: ordering by multiple columns
Date: Wed, 14 Mar 2007 17:12:35 +0100
Message-ID: <20070314161235.GB3930@KanotixBox> (raw)
In-Reply-To: <d4d13b4c0703140850i4957116bw8a25255131a56346@mail.gmail.com>
References: <d4d13b4c0703140850i4957116bw8a25255131a56346@mail.gmail.com>
Pablo Barrón <amentoraz@gmail.com> schrieb:
>
> Hi!
>
> I'm trying to order a list in which the first parameter to order is a specific
> field, and the second should vary depending on a specific condition. More
> explicit, I would like to do something like:
>
> - ORDER BY a.column1, [b.column2 if c.value != 19 || c.column2 if c.value==19]
>
> That is to say, use a column if a value on each row isn't 19, OR use a
> different column if it isn't. How could I solve this? I've got to have a global
You can do something like this:
order by a.column1, case when c.value != 19 then b.column2 else c.column2 end;
*untested*, but the way is to use a case when <condition> then ... else
... end; - construct.
Andreas
--
Really, I'm not out to destroy Microsoft. That will just be a completely
unintentional side effect. (Linus Torvalds)
"If I was god, I would recompile penguin with --enable-fly." (unknow)
Kaufbach, Saxony, Germany, Europe. N 51.05082°, E 13.56889°
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To: pgsql-sql@postgresql.org
Cc: akretschmer@spamfence.net
Subject: Re: ordering by multiple columns
In-Reply-To: <20070314161235.GB3930@KanotixBox>
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