oracle闪回查询

1.查询删除数据的时间点的数据（也就是闪回至该时间点之前的数据）

SELECT * FROM gt19
AS OF TIMESTAMP TO_TIMESTAMP('2017-12-21 18:30:00', 'YYYY-MM-DD HH24:MI:SS')
WHERE gt12001 = 'c9309c3427e04c8982cd56a251ff772c';

2.然后恢复删除且已提交的数据

flashback table gt19 to timestamp to_timestamp('2017-12-31 18:30:00','yyyy-mm-dd hh24:mi:ss')

或者：

INSERT INTO gt19 (
SELECT * FROM gt19
AS OF TIMESTAMP TO_TIMESTAMP('2017-12-21 18:30:00', 'YYYY-MM-DD HH24:MI:SS')
WHERE gt12001 = 'c9309c3427e04c8982cd56a251ff772c'
);