Re: user defined aggregate for percentile calculations

In response to Kashmir :
>
> cant seem to find anything about this,
> would it possible at all to create a percentile-aggregate in pgres?
> any pointers?
> tia
> -k

I'm not sure if i understand your problem, but how about:

test=*# select * from percentile ;
 id | value
----+-------
  1 |    10
  2 |    20
  3 |    30
  4 |    50
(4 rows)

test=*# select a.id, a.value, (a.value*100/foo.summe)::numeric(10,2)
from percentile a, (select sum(value) as summe from percentile ) as foo
group by a.id, a.value, foo.summe order by id;
 id | value | numeric
----+-------+---------
  1 |    10 |    9.00
  2 |    20 |   18.00
  3 |    30 |   27.00
  4 |    50 |   45.00
(4 rows)


HTH, Andreas
--
Andreas Kretschmer
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