Microsoft SQL Server 错误：916
In SQL Server Management Studio in Microsoft SQL Server 2008, you expand the Databases folder in Object Explorer. When you do this, you may receive the following error message:
The server principal '
X' is not able to access the database '
Y' under the current security context (Microsoft SQL Server, Error:916)
Note In this error message, X is a placeholder for the user name. Y is a placeholder for the database name.
Therefore, you cannot access any databases in the Databases folder in Object Explorer.
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