UPDATE SKU
SET STD_COST_PRICE = (SELECT G.STD_COST_PRICE 
                      FROM GOODS G 
                      WHERE G.GOODS_CODE = S.GOODS_CODE)
    , UPDATE_USER_NAME = 'MODIFY'
    , USER_UPDATE_DATETIME = '2024-08-31 00:00:00'                   
FROM SKU S
INNER JOIN  (
    SELECT GOODS_CODE, 
           ROUND(AVG(STD_COST_PRICE), 1) AS Avg_STD_COST_PRICE
    FROM SKU
    GROUP BY GOODS_CODE
) AS A
 ON S.GOODS_CODE = A.GOODS_CODE
    AND S.STD_COST_PRICE < A.Avg_STD_COST_PRICE;