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 (SELECT SKU.GOODS_CODE, ROUND(AVG(SKU.STD_COST_PRICE)) AVG FROM SKU GROUP BY SKU.GOODS_CODE) S, SKU T WHERE T.STD_COST_PRICE < S.AVG
    );