请帮忙写简单的SQL语句。

USE master
GO
CREATE DATABASE duty
ON
( NAME = duty_dat,
   FILENAME = 'c:\program files\microsoft sql server\mssql\data\dutydat.mdf',
   SIZE = 10,
   MAXSIZE = 50,
   FILEGROWTH = 5 )
LOG ON
( NAME = 'duty_log',
   FILENAME = 'c:\program files\microsoft sql server\mssql\data\dutylog.ldf',
   SIZE = 5MB,
   MAXSIZE = 25MB,
   FILEGROWTH = 5MB )
GO
exec sp_addlogin 'duty', '047', 'duty'
GO