Net stop mssqlserver
Setup /QUIET /ACTION=REBUILDDATABASE /instancename=mssqlserver /SQLSYSADMINACCOUNTS=paul /sapwd=1qaz2wsx /sqlcollation=Latin1_General_CI_AI
Net start mssqlserver
paul指的是windows的用户,密码随便写,只要符合机制就行.
原文：http://www.cnblogs.com/friendwang1001/p/5110874.html