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indexed aggregates?

From: "henlin" <henlin(at)yandex(dot)ru>
To: pgsql-novice(at)postgresql(dot)org
Subject: indexed aggregates?
Date: 2007-03-26 18:39:19
Message-ID: 46081357.000002.05062@webmail13.yandex.ru (view raw or flat)
Thread:
Lists: pgsql-novice
hi.

Is were any way to make aggregates work faster? Like some kind of indexes? 

as for example "SELECT a,sum(b) FROM c GROUP BY a;"

The only thing come to my mind is tmp tables && triggers && some kind of functions (not sure, which and how).

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