From: Emi Lu <emilu@encs.concordia.ca>
To: Scott Marlowe <scott.marlowe@gmail.com>
Cc: Josh Williams <joshwilliams@ij.net>
Cc: pgsql-sql@postgresql.org
Subject: Re: Get the max(value1, value2, value3) from a table
Date: Mon, 07 Jan 2008 17:53:26 -0500
Message-ID: <4782AD66.3060606@encs.concordia.ca> (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>
>>> 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...
IF 8.1, "select greatest(col1, col2, col3) from test" is exactly what I
am looking for.
I would do the optional query by union/or for now.
Thanks!
Ly.
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To: pgsql-sql@postgresql.org
Cc: emilu@encs.concordia.ca, scott.marlowe@gmail.com, joshwilliams@ij.net
Subject: Re: Get the max(value1, value2, value3) from a table
In-Reply-To: <4782AD66.3060606@encs.concordia.ca>
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