SELECT MAX(sort) FROM hrms_dept WHERE parent_id = #{parentId} SELECT count(1) FROM hrms_employee_dept WHERE dept_id = #{deptId} SELECT d.* FROM hrms_dept d INNER JOIN hrms_dept_position dp ON d.id = dp.dept_id WHERE dp.position_id = #{positionId} SELECT id,name,parent_id,sort FROM hrms_dept SELECT id,name,parent_id,sort FROM hrms_dept WHERE parent_id = #{parentId}