update
    SKU
set
    STD_COST_PRICE = SUB.scp
    ,UPDATE_USER_NAME = 'MODIFY'
    ,USER_UPDATE_DATETIME = '2024-08-31 00:00:00'
FROM
    (
        SELECT
            gd.GOODS_CODE as gcd
            ,gd.STD_COST_PRICE as scp
            ,round(avg(sk.STD_COST_PRICE)) as skavg
        FROM
            SKU as sk
            INNER JOIN GOODS as gd
            ON sk.GOODS_CODE = gd.GOODS_CODE
        GROUP BY
            gd.GOODS_CODE,gd.STD_COST_PRICE
    ) as SUB
where
	GOODS_CODE = SUB.GOODS_CODE AND 
    STD_COST_PRICE < SUB.skavg