SELECT l1.lab_items_sub_group_code,l2.lab_items_sub_group_name,l1.lab_items_code,l3.lab_items_name
FROM lab_items_sub_group_list l1
LEFT OUTER JOIN lab_items_sub_group l2 ON l2.lab_items_sub_group_code = l1.lab_items_sub_group_code
LEFT OUTER JOIN lab_items l3 ON l3.lab_items_code = l1.lab_items_code
ORDER BY l1.lab_items_sub_group_code