her example, if both A and B
   have granted the same privilege to C, A can revoke their own grant
   but not B's grant, so C will still effectively have the privilege.
  </p><p>
    When a non-owner of an object attempts to <code class="command">REVOKE</code> privileges
    on the object, the command will fail outright if the user has no
    privileges whatsoever on the object.  As long as some privilege is
    available, the command will proceed, but it will revoke only those
    privileges for which the 