List the numbers of all employees who do not earn commission.

EMPNO ENAME 7369 SMITH 7499 ALLEN 7521 WARD 7566 JONES 7654 MARTIN 7698 BLAKE 7782 CLARK 7788 SCOTT 7839 KING 7844 TURNER 7876 ADAMS 7900 JAMES 7902 FORD 7934 MILLER JOB CLERK SALESMAN SALESMAN MANAGER SALESMAN MANAGER MANAGER ANALYST PRESIDENT SALESMAN CLERK CLERK ANALYST CLERK MGR 7902 7698 7698 7839 7698 7839 7839 7566 7698 7788 7698 7566 7782 HIREDATE SAL 800 1600 1250 17-Dec-80 20-Feb-81 22-Feb-81 02-Apr-81 2975 28-Sep-81 1250 01-May-81 2850 09-Jun-81 09-Dec-82 17-Nov-81 08-Sep-81 12-Jan-83 03-Dec-81 03-Dec-81 23-Jan-82 2450 3000 5000 1500 1100 950 3000 1300 COMM 300 500 1400 0 DEPTNO 20 30 8888 30 20 30 30 10 20 10 30 20 30 20 10