oracle 查询N秒之前的数据

select* from txt001_menu 
as of timestamp (systimestamp - interval '300'minute)
wheremenuid = '060201' --查找txt001_menu表中300分钟之前的数据
>>>>select * from txt001_menu as of timestamp (systimestamp - interval'600' second) where menuid = '060201' --查找txt001_menu表中600秒之前的数据
>>>>select * from txt001_menu as of timestamp (systimestamp - interval '3'hour)
wheremenuid = '060201' --查找txt001_menu表中3小时之前的数据
>>>>select * from txt001_menu as of timestamp (systimestamp - interval '1'day)
wheremenuid = '060201' --查找txt001_menu表中1天之前的数据
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timestamp(ags) 方法 
interval（时间间隔）类型用来存储两个时间戳之间的时间间隔
时间间隔类型interval请看下一篇文章：http://blog.sina.com.cn/s/blog_4b5bc01101011d76.html