用户、组或角色'xxx'在当前数据库中已存在
当我们在新环境下还原一个完整备份，然后新建登录名并指定用户映射时会遇到如下图所示的报错，即我们常说的孤立用户。你可以先删除用户，再建登录，但用户较多、权限设置各异时逐个地删除重建，显然比较耗时。 这时我们可以使用SQL Server自带的sp_change_us
当我们在新环境下还原一个完整备份，然后新建登录名并指定用户映射时会遇到如下图所示的报错，即我们常说的孤立用户。你可以先删除用户，再建登录，但用户较多、权限设置各异时逐个地删除重建，显然比较耗时。
这时我们可以使用SQL Server自带的sp_change_users_login，来将现有数据库用户映射到 SQL Server 登录名：
exec sp_change_users_login 'AUTO_FIX','ASRS_F1'
关于sp_change_users_login更详细的说明和用法可参考MSDN：http://msdn.microsoft.com/zh-cn/library/ms174378.aspx
及孤立用户故障排除：http://technet.microsoft.com/zh-cn/library/ms175475.aspx
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