A user's permissions are a combination of those that have been granted and those that have been revoked. By revoking and granting permissions, you can manage the pattern of user permissions on a database. You must be a user with DBA authority or the owner of the database object to grant or revoke permissions on a database object.
The REVOKE statement revokes permissions that have been explicitly granted to the user (that is, not inherited from the groups to which they belong).
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