| From: | Martijn van Oosterhout <kleptog(at)svana(dot)org> |
|---|---|
| To: | Jasen Betts <jasen(at)xnet(dot)co(dot)nz> |
| Cc: | pgsql-general(at)postgresql(dot)org |
| Subject: | Re: DISTINCT ON without ORDER BY |
| Date: | 2009-04-22 06:27:24 |
| Message-ID: | 20090422062724.GA21883@svana.org |
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| Lists: | pgsql-general |
On Tue, Apr 21, 2009 at 12:11:26PM +0000, Jasen Betts wrote:
> > Is there a way to acheive the above result without a sort and without a
> > self-join?
>
> anyway you could possibly write an agregate function that returns a
> copy of the row with the highest id?
Put that way it sounds like something for a window function. Not sure
if they can use a HashAggrgate though.
Have a nice day,
--
Martijn van Oosterhout <kleptog(at)svana(dot)org> http://svana.org/kleptog/
> Please line up in a tree and maintain the heap invariant while
> boarding. Thank you for flying nlogn airlines.
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