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From: TJ O'Donnell <tjo@acm.org>
To: stephen.quinney@computing-services.oxford.ac.uk
Cc: pgsql-sql@postgresql.org
Date: Fri, 15 Apr 2005 05:52:52 -0700 (PDT)
Message-ID: <1168.12.10.164.2.1113569572.squirrel@gnova.com> (raw)

There some documentation about aggregate functions in the manual, for example:
http://www.postgresql.org/docs/7.4/static/sql-createaggregate.html

Here's a simple agg function that should work for you,
assuming your col types are int4.

CREATE AGGREGATE andsum (
 sfunc = int4and,
 basetype = int4,
 stype = int4
);

TJ

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