时间点还原
backup database sbxz to disk='c:/aa.bak' with init
backup log sbxz to disk='c:/aa_log.bak' with init
restore database sbxz from disk='c:/aa.bak' with replace,norecovery
restore log sbxz from disk='c:/aa_log.bak' with recovery,stopat='2006-03-01 20:19:00'