1532. 最近的三笔订单

表：Customers

+---------------+---------+
| Column Name   | Type    |
+---------------+---------+
| customer_id   | int     |
| name          | varchar |
+---------------+---------+
customer_id 是该表具有唯一值的列
该表包含消费者的信息

 

表：Orders

+---------------+---------+
| Column Name   | Type    |
+---------------+---------+
| order_id      | int     |
| order_date    | date    |
| customer_id   | int     |
| cost          | int     |
+---------------+---------+
order_id 是该表具有唯一值的列
该表包含 id 为 customer_id 的消费者的订单信息
每一个消费者 每天一笔订单

 

写一个解决方案，找到每个用户的最近三笔订单。如果用户的订单少于 3 笔，则返回他的全部订单。

返回的结果按照 customer_name 升序 排列。如果有相同的排名，则按照 customer_id 升序 排列。如果排名还有相同，则按照 order_date 降序 排列。

结果格式如下例所示：

 

示例 1:

输入：
Customers
+-------------+-----------+
| customer_id | name      |
+-------------+-----------+
| 1           | Winston   |
| 2           | Jonathan  |
| 3           | Annabelle |
| 4           | Marwan    |
| 5           | Khaled    |
+-------------+-----------+

Orders
+----------+------------+-------------+------+
| order_id | order_date | customer_id | cost |
+----------+------------+-------------+------+
| 1        | 2020-07-31 | 1           | 30   |
| 2        | 2020-07-30 | 2           | 40   |
| 3        | 2020-07-31 | 3           | 70   |
| 4        | 2020-07-29 | 4           | 100  |
| 5        | 2020-06-10 | 1           | 1010 |
| 6        | 2020-08-01 | 2           | 102  |
| 7        | 2020-08-01 | 3           | 111  |
| 8        | 2020-08-03 | 1           | 99   |
| 9        | 2020-08-07 | 2           | 32   |
| 10       | 2020-07-15 | 1           | 2    |
+----------+------------+-------------+------+
输出：
+---------------+-------------+----------+------------+
| customer_name | customer_id | order_id | order_date |
+---------------+-------------+----------+------------+
| Annabelle     | 3           | 7        | 2020-08-01 |
| Annabelle     | 3           | 3        | 2020-07-31 |
| Jonathan      | 2           | 9        | 2020-08-07 |
| Jonathan      | 2           | 6        | 2020-08-01 |
| Jonathan      | 2           | 2        | 2020-07-30 |
| Marwan        | 4           | 4        | 2020-07-29 |
| Winston       | 1           | 8        | 2020-08-03 |
| Winston       | 1           | 1        | 2020-07-31 |
| Winston       | 1           | 10       | 2020-07-15 |
+---------------+-------------+----------+------------+
解释：
Winston 有 4 笔订单, 排除了 "2020-06-10" 的订单, 因为它是最老的订单。
Annabelle 只有 2 笔订单, 全部返回。
Jonathan 恰好有 3 笔订单。
Marwan 只有 1 笔订单。
结果表我们按照 customer_name 升序排列，customer_id 升序排列，order_date 降序排列。

 

进阶：

• 你能写出最近 n 笔订单的通用解决方案吗?

select b.name as customer_name, a.customer_id, a.order_id, a.order_date
from 
(
    select order_id, customer_id, row_number()over(partition by customer_id order by order_date desc) as rn, order_date
    from Orders
)a
join customers b
on a.customer_id = b.customer_id
where a.rn < 4
order by customer_name, customer_id, order_date desc

# Write your MySQL query statement below
SELECT 
    c.name customer_name,
    c.customer_id, 
    t.order_id, 
    t.order_date
FROM (
    SELECT  
        order_id,
        order_date,
        customer_id,
        row_number() over(partition by customer_id order by order_date DESC) as rank_tag
    FROM orders ) t
LEFT JOIN customers c  
    ON t.customer_id = c.customer_id    
WHERE 
    rank_tag <= 3
ORDER BY 
    name, customer_id, order_date DESC;