用事务日志来恢复数据库

--完全备份库
backup database demo to disk='d:demo.bak' with format

--删表
drop table demo_table

--备份日志
backup log demo to disk='d:demo_log.bak' with format

--重挂完全备份
restore database demo from disk='d:demo.bak' with replace,norecovery

--恢复
restore log demo from disk='d:demo_log.bak' with recovery ,stopat='2013-01-28 14:45:50.280'

--查看lsn 起始点

restore headeronly from disk = 'd:demo_log.bak'
restore headeronly from disk = 'd:demo.bak'

中间不要切换数据库的属性-->选项-->故障模型（simple下不可备份日志文件）