What is mutating trigger
EMPNO ENAME JOB MGR HIREDATE SAL COMM DEPTNO 7369 SMITH CLERK 7902 17-Dec-80 800 20 7499 ALLEN SALESMAN 7698 20-Feb-81 1600 300 30 7521 WARD SALESMAN 7698 22-Feb-81 1250 500 30 7566 JONES MANAGER 7839 02-Apr-81 2975 20 7654 MARTIN SALESMAN 7698 28-Sep-81 1250 1400 30 7698 BLAKE MANAGER 7839 01-May-81 2850 30 7788 SCOTT ANALYST 7566 09-Dec-82 3000 20 7844