user defined aggregate for percentile calculations

From: Kashmir <kashmir_us_1999(at)yahoo(dot)com>
To: pgsql-general(at)postgresql(dot)org
Subject: user defined aggregate for percentile calculations
Date: 2009-04-06 02:51:13
Message-ID: 166533.88842.qm@web31906.mail.mud.yahoo.com
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cant seem to find anything about this,
would it possible at all to create a percentile-aggregate in pgres?
any pointers?
tia
-k

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