***************************************************
flashback 查询表在某个时间点的数据
flashback 查询表在某个时间点的数据
****************************************************
create table scott.aaa as select * from hs.trade_time ;
insert into sscott.aaa
select * from
hs.trade_time
as of timestamp to_timestamp('20170718 172030′,’YYYYMMDD
HH24MISS')
;
