Josh,
> At the end of this message is some code I used to find medians.
> It's kind of a hack, but approximately works, and is intended as a
> somewhat awkward stopgap for people who need to use medians. It
> illustrates the limitations of the current aggregate function setup,
> which works so nicely for avg() and stddev().
Actually, finding the median is one of the classic SQL problems. You can't do
it without 2 passes through the data set, disallowing the use of traditional
aggregate functions. Joe Celko has half a chapter devoted to various methods
of finding the median.
Can I talk you into submitting your code to Techdocs? I'd love to have it
somewhere where it won't get buried in the mailing list archives.
--
-Josh Berkus
