Re: Get the max(value1, value2, value3) from a table

From: Josh Williams <joshwilliams(at)ij(dot)net>
To: emilu(at)encs(dot)concordia(dot)ca
Cc: pgsql-sql(at)postgresql(dot)org
Subject: Re: Get the max(value1, value2, value3) from a table
Date: 2008-01-07 22:38:57
Message-ID: 1199745537.5877.9.camel@godzilla.local.scalefeather.com
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On Mon, 2008-01-07 at 17:03 -0500, Emi Lu wrote:
> select ?max?(col1, col2, col3) as result;
> will return
>
> result
> -------
> 5
> 8
> 12
>
> (3 rows)

8.1 (I believe?) introduced GREATEST(), which does precisely what you're
looking for.

But if 8.0 is a must, you'll probably have to create your own function
to do that. Which should be fairly easy to do if you're working with a
static number of columns/data types/etc...

- Josh

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