DROP TABLE IF EXISTS `objects_access`;
CREATE TABLE `objects_access` (
  `master` int(10) unsigned NOT NULL default '0',
  `map` smallint(6) unsigned NOT NULL default '0',
  `slave` int(10) unsigned NOT NULL default '0',
  `access` int(10) unsigned NOT NULL default '0',
  UNIQUE KEY `access_u` (`master`,`map`,`slave`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

INSERT INTO `objects_access` VALUES (1,0,0,700),(1,1,1,400),(1,5,5,400),(1,12,12,400),(1,12,32,400),(4,12,32,400);

DROP TABLE IF EXISTS `objects_path`;
CREATE TABLE `objects_path` (
  `id` int(10) unsigned NOT NULL default '0',
  `pid` int(10) unsigned NOT NULL default '0',
  `map` smallint(6) unsigned NOT NULL default '0',
  `level` tinyint(4) unsigned NOT NULL default '0',
  `title` varchar(255) default NULL,
  PRIMARY KEY  (`id`,`pid`,`map`),
  KEY `level` (`level`),
  KEY `id` (`id`,`map`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

INSERT INTO `objects_path` VALUES (6,5,12,7,'a'),(12,0,0,7,'a'),(12,1,0,7,'a'),(12,5,5,7,'a'),(12,5,12,7,'a');

SELECT b.sc
  FROM (SELECT (SELECT a.access
                  FROM objects_access a
                 WHERE a.map = op.map AND a.slave = op.pid AND a.master = 1) ac
          FROM objects_path op
         WHERE op.id = 12 AND op.map = 0) b;