  DECLARE
   TYPE plz_table_type IS TABLE OF City.Name%TYPE
        INDEX BY BINARY_INTEGER;
   plztab plz_table_type;
   i NUMBER;
  BEGIN
    plztab(37077):= 'Goettingen';
    plztab(79110):= 'Freiburg';
    plztab(33334):= 'Kassel';
    i := plztab.first;              -- 33334
   WHILE NOT i IS NULL LOOP
    dbms_output.put_line(i || ' ' || plztab(i));
    i := plztab.next(i);
   END LOOP;
  END;
  /
