plpgsql

CREATE FUNCTION hello() RETURNS text
AS '
BEGIN 
 RETURN ''Helo, World'';
END
'LANGUAGE 'plpgsql';
 RETURN arg1 + arg2;

CREATE OR REPLACE FUNCTION myfunc2(int4, int4)
  RETURNS int4 AS
$BODY$
DECLARE
 arg1 alias FOR $1;
 arg2 alias FOR $2;
BEGIN
 RETURN arg1 + arg2;
END
$BODY$
  LANGUAGE 'plpgsql' VOLATILE;
ALTER FUNCTION myfunc2(int4, int4) OWNER TO postgres;