MYSQL Window 函数

Question

订单在最终交付给客户之前有多个 order_status。有时客户会从不同来源下多个订单。我们接受一个订单，但我们拒绝另一个订单。我想知道取消重复订单时已接受订单的最新订单状态是什么。

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

我们得到了想要的客户的订单，然后我们得到了同一个订单的最新状态，也就是取消重复订单之前的状态：

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 Window 函数

MYSQL Window functions

mysql

rank