Customers Who Never Order
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题意：找出customer从没有在order表中出现过的顾客的名字
解法：用内部链接选出所有在order表中出现过的顾客的名字，并作为新表，然后取出customer中没在该表中出现过的名字
select Customers.name from Customers where id not in(select Customers.id from Customers inner join Orders on Customers.id = Orders.CustomerId) 0 0
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