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#Leetcode# 183. Customers Who Never Order

时间:2019-05-11 16:27:28      阅读:129      评论:0      收藏:0      [点我收藏+]

标签:code   customers   lan   wing   problem   nbsp   ebs   site   turn   

https://leetcode.com/problems/customers-who-never-order/

 

Suppose that a website contains two tables, the Customers table and the Orderstable. Write a SQL query to find all customers who never order anything.

Table: Customers.

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

Table: Orders.

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

Using the above tables as example, return the following:

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

代码:

# Write your MySQL query statement below
SELECT Name AS Customers FROM Customers WHERE Customers.Id NOT IN
(SELECT Orders.CustomerId FROM Orders)

  FH

#Leetcode# 183. Customers Who Never Order

标签:code   customers   lan   wing   problem   nbsp   ebs   site   turn   

原文地址:https://www.cnblogs.com/zlrrrr/p/10848755.html

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