#Leetcode# 183. Customers Who Never Order
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https://leetcode.com/problems/customers-who-never-order/
Suppose that a website contains two tables, the Customers
table and the Orders
table. 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
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