从不订购的客户
select c.Name as Customers from Customers c left join Orders o on c.Id = o.CustomerId where o.CustomerId is null
select customers.name customers from customers where customers.id not in (select orders.customerid from orders)
标签：customers,Customers,orders,183,CustomerId,leetcode,select From： https://www.cnblogs.com/carlzhang19/p/17306515.html