隐藏其它数据库，只让用户能够看到自己拥有权限的数据库

https://msdn.microsoft.com/zh-cn/library/ms189077(v=sql.105)

--查看权限
SELECT l.name as grantee_name, p.state_desc, p.permission_name 
FROM sys.server_permissions AS p JOIN sys.server_principals AS l 
ON   p.grantee_principal_id = l.principal_id
WHERE permission_name = 'VIEW ANY DATABASE' ;
GO

--同意或拒绝查看其它数据库
--GRANT VIEW ANY DATABASE TO user_school; 
DENY VIEW ANY DATABASE TO user_school; 

--给用户赋权限
ALTER AUTHORIZATION ON DATABASE::schoolDb_Copy TO user_school