aggregate function

From: "Claudio Lapidus" <clapidus(at)hotmail(dot)com>
To: <pgsql-general(at)postgresql(dot)org>
Subject: aggregate function
Date: 2003-09-05 21:09:51
Message-ID: BAY7-DAV4437FtWu2x300008209@hotmail.com
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Hello

I would like to know how can I define/create a new aggregate function. I
need a custom function that operate on a set of text strings and return a
certain string aggregate based on certain rules. But I cannot figure out how
can I define such a data set to operate on.

any hints?

cl.

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