原題鏈接：https://leetcode.com/problems/customers-who-never-order/description/
做完這道題目我才發現，我跟不就不懂 in, exists, not in, not exists，exists 用都不會用：

# Write your MySQL query statement below select Name as Customers from Customers where not exists (select CustomerId from Orders where Customers.Id = Orders.CustomerId);select Name as Customers from Customers where Id not in (select CustomerId from Orders);

轉載于:https://www.cnblogs.com/optor/p/8622852.html

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