问题是总和是保留字（参见 Summation - Wikipedia [ ^ ]）。



尝试更改变量名称。例如 mysum ：

The problem is that sum is a reserved word (see Summation - Wikipedia[^]).

Try to change the variable name. For example mysum:

DECLARE
   type namearray IS VARRAY(5) OF VARCHAR2(10);
   type grade IS VARRAY(5) OF INTEGER;
   names namearray;
   marks grade;
   total integer;
   mysum integer := 0;
BEGIN
   names := namearray('Kavita', 'Pritam', 'Ayan', 'Rishav', 'Aziz');
   marks := grade(98, 97, 78, 87, 92);
   total := names.count;
   dbms_output.put_line('Total '|| total || ' Students');
   FOR i in 1 .. total LOOP
      mysum := mysum + marks(i);
      dbms_output.put_line(marks(i));
  END LOOP;
dbms_output.put_line(mysum / total);
END;
/