Oracle PL/SQL-Tipps

DECLARE
 TYPE T IS TABLE OF emp.sal%TYPE INDEX BY BINARY_INTEGER;
 saltab T;
 avg10  emp.sal%type;

 FUNCTION avg_sal (maximum NUMBER DEFAULT 5000)  RETURN T
 IS
  avgtab T;
 BEGIN
 avgtab(10):=0; -- Defaultwert falls kein Wert zurückkommt
  FOR rec_avg IN (SELECT deptno,round(avg(sal),0) avgsal from emp
                  WHERE sal >= maximum group by deptno) loop
          avgtab(rec_avg.deptno) := rec_avg.avgsal; -- Werte für Abt. 10, 20 und 30
  END LOOP;
  RETURN avgtab;
 END;

BEGIN
 saltab := avg_sal(1000);
 saltab := avg_sal(6000); -- Kein Defaultwert
 dbms_output.put_line(saltab(10));
 avg10 := avg_sal(1000) (10); -- Average an der Stelle 10
 --avg10 := avg_sal (10);  --> Fehler falscher Typ!
END;
/