INSERT INTO t_subject_dept(subject_id, dept_id) VALUES (#{item.subjectId}, #{item.deptId}) DELETE FROM t_subject_dept WHERE subject_id = #{subjectId} SELECT tdq.dept_id, td.name as deptName FROM t_subject_dept tdq INNER JOIN t_department td ON td.id = tdq.dept_id WHERE tdq.subject_id = #{subjectId} SELECT s.id, s.name as subjectName FROM t_subject_dept sd INNER JOIN t_subject s ON sd.subject_id = s.id AND sd.dept_id = #{deptId} AND s.deleted = 0 DELETE FROM t_subject_dept WHERE dept_id = #{deptId}