通过以下SQL创建的用户，如何删除

USE master

GO

CREATE LOGIN mr WITH PASSWORD = 'mrsoft' MUST_CHANGE,

    CHECK_EXPIRATION = ON;

GO

GRANT VIEW SERVER STATE TO mr;

GO

CREATE TRIGGER connection_limit_trigger

ON ALL SERVER WITH EXECUTE AS 'mr'

FOR LOGON

AS

BEGIN

IF ORIGINAL_LOGIN()= 'mr' AND

    (SELECT COUNT(*) FROM sys.dm_exec_sessions

            WHERE is_user_process = 1 AND

                original_login_name = 'mr') > 1

    ROLLBACK;

END;