这些 role 对象的权限将被应用到凭证中指定的用户。
The permissions of these role objects will be applied to the user specified in the credentials.
然后，您可以建立对应至凭证的使用者，并授与该预存程序需要存取之物件的权限给凭证使用者。
You then create a user mapped to the certificate, granting the certificate user permissions on the objects the stored procedure needs to access.
当您执行已经使用某个凭证签署的预存程序时，授与凭证使用者的权限就会与呼叫端的权限合并。
When a stored procedure that has been signed with a certificate executes, the permissions granted to the certificate user are merged with those of the caller.
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