Oracle PL/SQL-Tipps

CREATE OR REPLACE FUNCTION ora_func (
   p_eins IN INTEGER DEFAULT 42,
   p_zwei IN INTEGER DEFAULT 4711,
   p_drei IN VARCHAR2 DEFAULT 'test'
) RETURN VARCHAR2 AS
BEGIN
   RETURN 'p_eins='
          || p_eins
          || ', p_zwei='
          || p_zwei
          || ', p_drei='
          || p_drei;
END; 
/SELECT ora_func(p_eins=>42, p_zwei=>4711, p_drei=>test ) from dual;
SELECT ora_func(p_eins=>null) FROM dual;