From: Erik Jones <erik@myemma.com>
To: Scott Marlowe <scott.marlowe@gmail.com>
Cc: Josh Williams <joshwilliams@ij.net>
Cc: emilu@encs.concordia.ca
Cc: pgsql-sql@postgresql.org
Subject: Re: Get the max(value1, value2, value3) from a table
Date: Mon, 7 Jan 2008 17:16:58 -0600
Message-ID: <53C367DF-24B3-425C-9EE7-BBA7336D3A89@myemma.com> (raw)
In-Reply-To: <dcc563d10801071443g3c91a29sd27ce5bdf6c4652b@mail.gmail.com>
References: <4782A1B2.5050804@encs.concordia.ca>
<1199745537.5877.9.camel@godzilla.local.scalefeather.com>
<dcc563d10801071443g3c91a29sd27ce5bdf6c4652b@mail.gmail.com>
On Jan 7, 2008, at 4:43 PM, Scott Marlowe wrote:
> On Jan 7, 2008 4:38 PM, Josh Williams <joshwilliams@ij.net> wrote:
>> 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.
>
> How would greatest give him three rows like that? Maybe I'm
> misunderstanding what the OP was asking for...
His test data was:
col1 col2 col3
----------------------
1 5 2
8 1 3
12 1 1
So, SELECT test(col1, col2, col3);
returning
test
-----
5
8
12
Is giving the max of the three columns for each row.
Erik Jones
DBA | Emma®
erik@myemma.com
800.595.4401 or 615.292.5888
615.292.0777 (fax)
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To: pgsql-sql@postgresql.org
Cc: erik@myemma.com, scott.marlowe@gmail.com, joshwilliams@ij.net, emilu@encs.concordia.ca
Subject: Re: Get the max(value1, value2, value3) from a table
In-Reply-To: <53C367DF-24B3-425C-9EE7-BBA7336D3A89@myemma.com>
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