这些数据库脚本是什么意思？

[QQ玉]

USE [ ]
GO
/****** Object: User [tch] Script Date: 07/12/2016 18:06:48 ******/
CREATE USER [tch] WITHOUT LOGIN WITH DEFAULT_SCHEMA=[dbo]
GO
/****** Object: User [lzs] Script Date: 07/12/2016 18:06:48 ******/
CREATE USER [lzs] WITHOUT LOGIN WITH DEFAULT_SCHEMA=[dbo]
GO
/****** Object: User [lzq] Script Date: 07/12/2016 18:06:48 ******/
CREATE USER [lzq] WITHOUT LOGIN WITH DEFAULT_SCHEMA=[dbo]
GO
/****** Object: User [JY\user] Script Date: 07/12/2016 18:06:48 ******/
CREATE USER [JY\user] WITH DEFAULT_SCHEMA=[JY\user]
GO
/****** Object: User [JQERP] Script Date: 07/12/2016 18:06:48 ******/
CREATE USER [JQERP] WITHOUT LOGIN WITH DEFAULT_SCHEMA=[dbo]
GO
/****** Object: User [dch] Script Date: 07/12/2016 18:06:48 ******/
CREATE USER [dch] WITHOUT LOGIN WITH DEFAULT_SCHEMA=[dbo]
GO
/****** Object: Schema [JY\user] Script Date: 07/12/2016 18:06:48 ******/
CREATE SCHEMA [JY\user] AUTHORIZATION [JY\user]
GO