Question

订单在最终交付给客户之前具有多个order_status。有时，客户从不同的来源下了多个订单。我们接受一个订单，但拒绝另一个订单。我想找出取消重复订单时接受订单的最新订单状态。

LEFT JOIN(
            SELECT order_id AS order_id,order_status,max(addtime(`timestamp`,'05:30:00')) AS timestamp
            FROM pe2.order_history
            GROUP BY 1,2
) oh ON oh.order_id = ord.order_id AND oh.timestamp <= c.time. 
c.time. is duplicate order cancellation time.

Answer 1

我们获得了所需的客户订单，然后获得了同一订单的最新状态，该状态在取消重复订单之前：

SELECT order.*,
(SELECT order_status FROM order_history AS oh 
WHERE order_id = order.id AND timestamp <= cancel_time
ORDER BY timestamp DESC LIMIT 1) AS last_status
FROM order
WHERE order.ID = accepted_order

MYSQL窗口函数

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