查看进行DML操作之前的数据

-- 7788 SCOTT ANALYST 7566 1987-04-19 3000.00 20
select * from emp as of timestamp sysdate-1*30/24/60--to_timestamp('2022-04-08 10:30:56','yyyy-mm-dd hh24:mi:ss');
select * from emp;
ctrl+e 快捷键 可以查看日志时间戳