-- 建立備份表      
create table emp_his as (select * from emp where 1=2);

<pre name="code" class="sql">-- 建立觸發器 
create or replace trigger tr_emp_del
-- 對scott.emp表在delete操作之前
  before delete on scott.emp
-- 對每一行進行觸發動作
  for each row

-- 觸發的具體動作
DECLARE
BEGIN

  INSERT INTO emp_his
    (deptno, empno, ename, job, mgr, sal, comm, hiredate)
  VALUES
    (:old.deptno,
     :old.empno,
     :old.ename,
     :old.job,
     :old.mgr,
     :old.sal,
     :old.comm,
     :old.hiredate);
END;
/
 

delete from emp where empno = 7369;
select * from emp_his;