UPDATE SKU
SET 
    STD_COST_PRICE = (
        SELECT G.STD_COST_PRICE 
        FROM GOODS G 
        WHERE G.GOODS_CODE = SKU.GOODS_CODE
    ),
    UPDATE_USER_NAME = 'MODIFY',
    USER_UPDATE_DATETIME = '2024-08-31 00:00:00'
    
WHERE 
    STD_COST_PRICE < (
        SELECT ROUND(AVG(S1.STD_COST_PRICE), 1)
        FROM SKU S1
        WHERE S1.GOODS_CODE = SKU.GOODS_CODE
    );