Re: Average over time

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>    ...etc. Obviously, the avg_asum is the average for asum up to the dt
> column's date. My gut feeling is that this can not be done -- but I
> don't know why. Is it possible?

Perhaps something like this:

SELECT thisday, AVG(asum) AS avg_asum
FROM
  (SELECT dt, SUM(amount) AS asum FROM transactions GROUP BY dt) AS x,
  (SELECT ('2007-01-01'::date+'1 day'::interval*q)::date AS thisday
   FROM generate_series(0,10) AS q) AS y
WHERE dt <= thisday
GROUP BY 1 ORDER BY 1;

- --
Greg Sabino Mullane greg@turnstep.com
PGP Key: 0x14964AC8 200703031916
http://biglumber.com/x/web?pk=2529DF6AB8F79407E94445B4BC9B906714964AC8
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