UPDATE SKU SET STD_COST_PRICE = SUB.STD_COST_PRICE, UPDATE_USER_NAME = 'MODIFY', 
USER_UPDATE_DATETIME = '2024-08-31 00:00:00'
FROM
    (
    SELECT
         SKU.GOODS_CODE,
         GD.STD_COST_PRICE,
         ROUND(AVG(SKU.STD_COST_PRICE)) AS SCP
    FROM
        SKU
    INNER JOIN GOODS AS GD
        ON SKU.GOODS_CODE = GD.GOODS_CODE
    GROUP BY
        SKU.GOODS_CODE,
        GD.STD_COST_PRICE
        )AS SUB

WHERE
    SKU.GOODS_CODE
    =SUB.GOODS_CODE
AND SKU.STD_COST_PRICE < SUB.SCP;