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No stddev() for interval?

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To: pgsql-general@xxxxxxxxxxxxxx
Subject: No stddev() for interval?
From: "Brendan Jurd" <direvus@xxxxxxxxx>
Date: Sun, 21 May 2006 01:14:15 +1000

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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