WITH
    Ave AS (
        SELECT
            GOODS_CODE,
            ROUND(AVG(STD_COST_PRICE), 1) AS STD_COST_PRICE
        FROM
            SKU
        GROUP BY
            GOODS_CODE
    ),
    GoodsStdCost AS (
        SELECT
            GOODS_CODE,
            STD_COST_PRICE AS GOODS_STD_COST_PRICE
        FROM
            GOODS
    )
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'
FROM
    SKU AS S
    INNER JOIN Ave ON S.GOODS_CODE = Ave.GOODS_CODE
    INNER JOIN GoodsStdCost G ON S.GOODS_CODE = G.GOODS_CODE
WHERE
    SKU.STD_COST_PRICE < Ave.STD_COST_PRICE