orclz>
orclz> select * from emp where ename='KING';

     EMPNO ENAME      JOB              MGR HIREDATE                   SAL       COMM     DEPTNO
---------- ---------- --------- ---------- ------------------- ---------- ---------- ----------
      7839 KING       PRESIDENT            1981-11-17:00:00:00       5000                    10

orclz> update emp set sal=1000  where ename='KING';

1 row updated.

orclz> commit;

Commit complete.

orclz> select * from emp as of timestamp sysdate-5/1440 where ename='KING';

     EMPNO ENAME      JOB              MGR HIREDATE                   SAL       COMM     DEPTNO
---------- ---------- --------- ---------- ------------------- ---------- ---------- ----------
      7839 KING       PRESIDENT            1981-11-17:00:00:00       5000                    10

orclz>