UPDATE
    SKU
SET
    STD_COST_PRICE = UPD_SKU.UPD_PRICE
    , UPDATE_USER_NAME = 'MODIFY'
    , USER_UPDATE_DATETIME = '2024-08-31 00:00:00'
FROM
    (SELECT
        SK.GOODS_CODE AS GOODS_CODE
        , ROUND(AVG(SK.STD_COST_PRICE),0) AS AVG_PRICE
        , GO.STD_COST_PRICE AS UPD_PRICE
    FROM
        SKU AS SK
        INNER JOIN GOODS AS GO
            ON GO.GOODS_CODE = SK.GOODS_CODE
    GROUP BY
        SK.GOODS_CODE
        , GO.STD_COST_PRICE
        ) AS UPD_SKU
WHERE
    UPD_SKU.GOODS_CODE = SKU.GOODS_CODE
    AND UPD_SKU.AVG_PRICE- UPD_SKU.UPD_PRICE < 0