select
    ITEM_CODE as CODE,
    case
        when ITEM_NAME is null then 'NULL'
        else ITEM_NAME
    end as NAME,
    sum(ORDER_QTY) as SUM_QTY
from WAREHOUSE
    join ORDERS using(WH_CODE)
    join ORDERS_DTL using(ORDER_NO)
    left outer join ITEM using(ITEM_CODE)
where WH_NAME = '浦和倉庫'
group by ITEM_CODE
having SUM_QTY >= 50
order by SUM_QTY desc, CODE desc;