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