1.根据时间点查系统版本号scn:
select timestamp_to_scn(to_timestamp('2013-01-07 11:20:00','YYYY-MM-DD HH:MI:SS')) from dual
2.查看被误删数据的表scn时间点的数据是否要恢复的数据：
select count(*) from ct_sal_orderToSaleIssue as of scn 44482681
3.创建临时保存数据的表：
create table temp1 as select * from ct_sal_orderToSaleIssue
4.往临时数据表插入被误删前的数据：
insert into temp1 select * from ct_sal_orderToSaleIssue as of scn 44482681
5.从临时表往原表上插入被删除的数据：
insert into ct_sal_orderToSaleIssue select * from temp1