SQL> set timing on
SQL> select empno,ename,job from scott.emp ;
EMPNO ENAME JOB
---------- ---------- ---------
7369 xiaonan CLERK
7499 ALLEN SALESMAN
7521 WARD SALESMAN
7566 JONES MANAGER
7654 MARTIN SALESMAN
7698 BLAKE MANAGER
7782 CLARK MANAGER
7788 SCOTT ANALYST
7839 KING PRESIDENT
7844 TURNER SALESMAN
7876 ADAMS CLERK
7900 JAMES CLERK
7902 FORD ANALYST
7934 MILLER CLERK
已选择14行。
已用时间: 00: 00: 00.01
以上数字输出分别是：Hours:Minutes:Seconds.Milliseconds
