无法重置sa密码

我正在尝试删除并重新创build一个帐户来重置密码。

IF EXISTS (SELECT * FROM sys.server_principals WHERE name = N'sa') DROP LOGIN [sa] GO 

我收到一个错误

 Cannot use the special principal 'sa'. 

当我尝试在SSMS中重置sa密码时,出现错误Cannot alter the login 'sa' because it does not exist or you don't have permission. Error: 15151 Cannot alter the login 'sa' because it does not exist or you don't have permission. Error: 15151

 sp_password NULL,'new_password','sa' go