Re: ordering by multiple columns

From: Andreas Kretschmer <akretschmer(at)spamfence(dot)net>
To: pgsql-sql(at)postgresql(dot)org
Subject: Re: ordering by multiple columns
Date: 2007-03-14 16:12:35
Message-ID: 20070314161235.GB3930@KanotixBox
Views: Raw Message | Whole Thread | Download mbox | Resend email
Thread:
Lists: pgsql-sql

Pablo Barrón <amentoraz(at)gmail(dot)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°

In response to

Browse pgsql-sql by date

  From Date Subject
Next Message Rodrigo De León 2007-03-14 16:14:49 Re: ordering by multiple columns
Previous Message Andrew Sullivan 2007-03-14 15:58:44 Re: import CSV file