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	S.GOODS_CODE,
    		,G.STD_COST_PRICE	 
           ROUND(AVG(S.STD_COST_PRICE), 1) AS Avg_STD_COST_PRICE
    FROM SKU S
    inner join GOODS AS G
    on S.GOODS_CODE=G.GOODS_CODE
    GROUP BY S.GOODS_CODE
    ,G.STD_COST_PRICE
) AS SUB
WHERE S.GOODS_CODE = SUB.GOODS_CODE
    AND S.STD_COST_PRICE < SUB.Avg_STD_COST_PRICE;