WITH tmp_avg AS (
    SELECT
      GOODS_CODE,
      ROUND(AVG(STD_COST_PRICE), 0) AS AVG_STD_COST_PRICE
    FROM
      SKU
    GROUP BY
      GOODS_CODE
)
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 
  SKU.GOODS_CODE IN (SELECT GOODS_CODE FROM tmp_avg)
  AND SKU.STD_COST_PRICE < (
    SELECT AVG_STD_COST_PRICE 
    FROM tmp_avg 
    WHERE tmp_avg.GOODS_CODE = SKU.GOODS_CODE
  );