update SKU
set STD_COST_PRICE = (
    select STD_COST_PRICE
    from GOODS
    where GOODS.STD_COST_PRICE < (
        select avg(STD_COST_PRICE)
        from SKU
        group by GOODS_CODE
    ) 
),
UPDATE_USER_NAME = 'MODIFY',
USER_UPDATE_DATETIME = '2024-08-31 00:00:00'