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