| From: | Ondrej Ivanič <ondrej(dot)ivanic(at)gmail(dot)com> |
|---|---|
| To: | Michael Giannakopoulos <miccagiann(at)gmail(dot)com> |
| Cc: | "pgsql-general(at)postgresql(dot)org general" <pgsql-general(at)postgresql(dot)org> |
| Subject: | Re: About aggregates... |
| Date: | 2012-11-29 21:25:07 |
| Message-ID: | CAM6mieLhSAzLeu+=e6GH-z5ASXhe7FHezVx3shdf0uvNNcp_pg@mail.gmail.com |
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| Lists: | pgsql-general |
Hi,
On 30 November 2012 08:06, Michael Giannakopoulos <miccagiann(at)gmail(dot)com> wrote:
> However an aggregate function
> feeds me one a tuple for each call, but I would like to have access to a
> batch of tuples per function call. Is there any possible way to perform
> something like this?
Yes, this might be good for you::
WINDOW
WINDOW indicates that the function is a window function rather than a
plain function. This is currently only useful for functions written in
C. The WINDOW attribute cannot be changed when replacing an existing
function definition.
http://www.postgresql.org/docs/9.1/static/sql-createfunction.html
Apart from C you can use this in Pl/R:
http://www.joeconway.com/plr/doc/plr-window-funcs.html
--
Ondrej
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