LeetCode 183. Customers Who Never Order (never ordered customers)

Topic Tags:

　　Topic gave us two tables Customers and Orders, Order had never let us find customers.

　　First order had been CustomerId from Orders, Customers then go inside to find there have been no Id, returns the name.

 

Java Solution:

Runtime:  264 ms, faster than 53 % 

Memory Usage: N/A

Completion Date: 06/01/2019

Key point: NOT IN

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

References: n / a

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