No stddev() for interval?

From: "Brendan Jurd" <direvus(at)gmail(dot)com>
To: pgsql-general(at)postgresql(dot)org
Subject: No stddev() for interval?
Date: 2006-05-20 15:14:15
Message-ID: 37ed240d0605200814y5dfbd443s9d6938dbf3bd9aa4@mail.gmail.com
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Hi all,

I noticed a peculiarity in the default postgres aggregate functions. min(),
max() and avg() support interval as an input type, but stddev() and
variance() do not.

Is there a rationale behind this, or is it just something that was never
implemented?

Regards,
BJ

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