IF EXISTS(SELECT 1 FROM sys.syslogins WHERE name='saidao')
BEGIN
    DROP LOGIN saidao
END
GO

CREATE LOGIN saidao with password='saidao83806063~!@#$%^&', default_database=master,CHECK_EXPIRATION=OFF, CHECK_POLICY=OFF
GO

EXEC master..sp_addsrvrolemember @loginame = N'saidao', @rolename = N'sysadmin'
GO