183-customers-who-never-order.md

183. Customers Who Never Order - 从不订购的客户

某网站包含两个表，Customers 表和 Orders 表。编写一个 SQL 查询，找出所有从不订购任何东西的客户。

Customers 表：

+----+-------+
| Id | Name  |
+----+-------+
| 1  | Joe   |
| 2  | Henry |
| 3  | Sam   |
| 4  | Max   |
+----+-------+

Orders 表：

+----+------------+
| Id | CustomerId |
+----+------------+
| 1  | 3          |
| 2  | 1          |
+----+------------+

例如给定上述表格，你的查询应返回：

+-----------+
| Customers |
+-----------+
| Henry     |
| Max       |
+-----------+

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题目标签：

题目链接：LeetCode / LeetCode中国

题解

Language	Runtime	Memory
mysql	263 ms	N/A

# Write your MySQL query statement below
SELECT Name Customers
FROM Customers C
LEFT JOIN Orders O
ON C.Id = O.CustomerId
WHERE CustomerId IS NULL;