Thomas,
On Wed, Aug 22, 2012 at 12:25 PM, Thomas Munro <munro(at)ip9(dot)org> wrote:
> I noticed that 'avg' works on 'interval', but 'stddev' and 'variance' don't:
I don't know why, but you could convert 'interval' into something else
where all the functions work:
CREATE OR REPLACE FUNCTION interval_to_seconds(interval)
RETURNS double precision AS $$
SELECT (extract(days from $1) * 86400)
+ (extract(hours from $1) * 3600)
+ (extract(minutes from $1) * 60)
+ extract(seconds from $1);
$$ LANGUAGE SQL;
Cheers,
Chris
--
Christopher Swingley
Fairbanks, Alaska
http://swingleydev.com/
cswingle(at)gmail(dot)com