有时候忘记备份数据，把数据清空了，或者删除了，这时候怎么恢复数据呢，使用下面sql即可，替换对应的table和column

INSERT INTO table1(
	column1,
	column2,
	column3
) SELECT
	column1,
	column2,
	column3
FROM
	table1
AS OF timestamp ( systimestamp