如何将一个SQL查询的结果与其他表的数据排序

Question

我有一个包含两个表的数据库。在一张桌子上，我用一栏显示了顾客的信息costumer_id和costumer_name列，我有一个带有客户订单的表，其中有order_id和customer_id列。该表如下所示：

客户：

+-------------+---------------+
| customer_id | customer_name |
+-------------+---------------+
|           1 | Joe           |
|           2 | Michael       |
|           3 | Ben           |
+-------------+---------------+

订单：

+----------+-------------+
| order_id | customer_id |
+----------+-------------+
|        1 |           1 |
|        2 |           2 |
|        3 |           3 |
+----------+-------------+

我现在有以下查询，它向我提供了每个客户的订单量。结果由customer_id排序。

SELECT customer_id, COUNT(order_id) FROM Orders GROUP BY customer_id ORDER BY customer_id ASC;

现在，我希望通过查询从Customer表中的customer_name对结果进行排序。我该如何实现？

Answer 1

您可以使用联接

SELECT Orders.customer_id
  , COUNT(orders.order_id) 
FROM Orders 
INNER JOIN Customers ON Customers.id = Orders.id
GROUP BY customer_id 
ORDER BY Customers.customer_name ASC;