ошибка sql

$q=mysql_query('select `person`.count(*) as `count`, `person_razd`.`name`, `person_razd`.`id` from `person_razd` on `person` left join `person`.`id_razd` = `person_razd`.`id` order by `person_razd`.`name` asc limit "'.$start.'", '.$set['p_str']);