CREATE OR REPLACE FUNCTION _concat(IN str1 text,IN str2 text,OUT str text) RETURNS text AS $BODY$ BEGIN str := ''; if str1 IS NOT NULL then str := str ||str1 ; end if; if str2 IS NOT NULL then str := str || str2 || ','; end if; END; $BODY$ LANGUAGE plpgsql VOLATILE COST 100; ALTER FUNCTION _concat(text,text) OWNER TO engires301; CREATE AGGREGATE concat ( BASETYPE = text,SFUNC = _concat,STYPE = text );
