相反，如果存在数据库用户，但没有与其关联的登录，则该用户将无法登录到SQL Server服务器中。

Conversely, if a database user exists but there is no login associated, the user is not able to log into SQL server server.

youdao

如果数据库中不存在针对特定登录的用户帐户，使用该登录的用户即使能够连接到SQL Server服务器，也无法访问数据库。

If no user account exists in a database for a specific login, the user that is using that login cannot access the database even though the user may be able to connect to the SQL server server.

youdao

无法打开数据库“研究”登录所请求的。

Cannot open database "studying" requested by the login.

youdao