183. Customers Who Never Order

Question

Total Accepted: 14489 Total Submissions: 43113 Difficulty: Easy

 

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       |+-----------+

 

 to see which companies asked this question

 

http://my.oschina.net/liusicong/blog/375039?p={

{currentPage+1}}

 

 

1 # Write your MySQL query statement below2 select Name from Customers c3     where c.Id not in4         (select CustomerId from Orders o)

 

1 # Write your MySQL query statement below2 select Name from 3     Customers c left join Orders o4         on c.Id = o.CustomerId5             where o.Id is NULL 6