CREATE TABLE `permissions_roles` (
  `id` int(11) unsigned NOT NULL AUTO_INCREMENT,
  `permission_id` int(11) unsigned NOT NULL,
  `role_id` int(11) unsigned NOT NULL,
  PRIMARY KEY (`id`),
  UNIQUE KEY `unique_permission_role` (`permission_id`,`role_id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
