UPDATE SKU
SET STD_COST_PRICE = GOODS.STD_COST_PRICE, UPDATE_USER_NAME = "MODIFY", USER_UPDATE_DATETIME = '2024-08-31 00:00:00'
FROM GOODS
WHERE SKU.GOODS_CODE = GOODS.GOODS_CODE AND
    SKU.SKU_CODE IN (
        SELECT T.SKU_CODE FROM SKU T, GOODS S WHERE T.GOODS_CODE = S.GOODS_CODE GROUP BY T.GOODS_CODE HAVING T.STD_COST_PRICE < ROUND(AVG(T.STD_COST_PRICE))
    );