Group by and lmit

From: "Bill Reynolds" <Bill(dot)Reynolds(at)ateb(dot)com>
To: <pgsql-general(at)postgresql(dot)org>
Subject: Group by and lmit
Date: 2010-11-02 14:40:21
Message-ID: 7C0800F63CCF4149AC0FC5EE2A04122607BA95AF@sr002-2k3exc.ateb.com
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Hey Folks - have a coded myself into a corner yet?

I have a situation with a select count / group by / order by query that
I need to limit each group to 500 entries. Not seeing a way to do this
in a single query, do I need to use multiple queries?

Group x has about 200 entries in it; group y has about 5-8k per x.

select x, y, count(*) as counter from mytable

group by x, y

order by x, counter, y

I only want the first 500 for each x.

Any tips or tricks someone might know would be appreciated.

I'm using postgres 8.3.7.

Thanks, Bill

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