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-- @tag: PgCommaAggregateFunction
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-- @description: Neue Postgres Funktion zur Abfrage mehrdeutiger Ergebniszeilen als kommagetrennte Liste
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-- @depends: release_2_4_1
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-- Taken from: http://www.zigo.dhs.org/postgresql/#comma_aggregate
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-- Copyright © 2005 Dennis Björklund
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-- License: Free
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-- Thx. to A. Kretschmer, http://archives.postgresql.org/pgsql-de-allgemein/2007-02/msg00006.php
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CREATE FUNCTION comma_aggregate(text,text) RETURNS text AS '
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SELECT CASE WHEN $1 <> '''' THEN $1 || '', '' || $2
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ELSE $2
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END;
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' LANGUAGE sql IMMUTABLE STRICT;
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CREATE AGGREGATE comma (basetype=text, sfunc=comma_aggregate, stype=text, initcond='' );
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