*LeetCode Mysql 查找歷來不購買的客戶

Customers: Id Name 1 Joe 2 Henry 3 Sam 4 Max Orders: Id CustomerId 1 3 2 1 Q: 根據Customers 和 Orders 表查找出歷來沒有發生購買行爲的人 A: select customers.name as "Customers" from customers where customers.id not in (

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