Re: Average over time

-----BEGIN PGP SIGNED MESSAGE-----
Hash: RIPEMD160

> ...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(at)turnstep(dot)com
PGP Key: 0x14964AC8 200703031916
http://biglumber.com/x/web?pk=2529DF6AB8F79407E94445B4BC9B906714964AC8
-----BEGIN PGP SIGNATURE-----

iD8DBQFF6g/PvJuQZxSWSsgRAxxVAKC/wV0vh+b9ZTi3hEjEOjGK+4sniACfeSdU
gqlKeLxqxylcZCCbY6OD1wQ=
=srvv
-----END PGP SIGNATURE-----