You can't specify target table 'item' for update in FROM clause

今天写sql处理历史数据时，报出标题的错误，sql如下:

UPDATE item
SET platf_min_sell_price = NULL,
 platf_max_sell_price = NULL
WHERE
    item_id IN (
        SELECT DISTINCT
            item_id
        FROM
            item_sku
        WHERE
            sku_id IN (
                SELECT
                    sku_id
                FROM
                    trade_sku_price
                WHERE
                    item_id IN (
                        SELECT
                            item_id
                        FROM
                            item
                        WHERE
                            platform_id = 123456
                        AND platf_min_sell_price IS NOT NULL
                        AND platf_max_sell_price IS NOT NULL
                    )
            )
        AND attributes IS NOT NULL
    )

意思大概就是你不能一边查着item表一边修改它，否则可能会引起问题。
stackoverflow给出的一种解决办法是，把子句查询结果存放到临时表中，修改后的sql如下：

UPDATE item
SET platf_min_sell_price = NULL,
 platf_max_sell_price = NULL
WHERE
    item_id IN (
        SELECT
            item_id
        FROM
            (
                (
                    (
                        SELECT DISTINCT
                            item_id
                        FROM
                            item_sku
                        WHERE
                            sku_id IN (
                                SELECT
                                    sku_id
                                FROM
                                    trade_sku_price
                                WHERE
                                    item_id IN (
                                        SELECT
                                            item_id
                                        FROM
                                            item
                                        WHERE
                                            platform_id = 123456
                                        AND platf_min_sell_price IS NOT NULL
                                        AND platf_max_sell_price IS NOT NULL
                                    )
                            )
                        AND attributes IS NOT NULL
                    )
                )
            ) AS t
    )