insert into university_relate_major ( university_id , major_id) values (#{emp.universityId,jdbcType=INTEGER}, #{emp.majorId,jdbcType=INTEGER}) delete university_relate_major where university_id = #{universityId} select f.id as f_id , f.major as f_major , s.id as s_id , s.major as s_major from university_major s join university_major f on f.id = s.p_id join university_relate_major r on s.id = r.major_id where r.university_id = #{id} select m.id from university_info info join university_relate_major rm on info.id=rm.university_id join university_major m on rm.major_id = m.id where m.major = #{major} and info.id = #{id}