WITH
    SUB AS (
        SELECT
            SK1.GOODS_CODE,
            G.STD_COST_PRICE,
            ROUND(AVG(SK1.STD_COST_PRICE)) AS SCP
        FROM
            SKU AS SK1
            INNER JOIN GOODS AS G ON SK1.GOODS_CODE = G.GOODS_CODE
        GROUP BY
            SK1.GOODS_CODE
    )
UPDATE SKU
SET
    STD_COST_PRICE = SUB.STD_COST_PRICE,
    UPDATE_USER_NAME = 'MODIFY',
    USER_UPDATE_DATETIME = '2024-08-31 00:00:00'
FROM
    SUB
WHERE
    SKU.GOODS_CODE = SUB.GOODS_CODE
    AND SKU.STD_COST_PRICE < SUB.SCP;