Leetcode : Customers Who Never Order

最新推荐文章于 2021-10-23 05:24:25 发布
最新推荐文章于 2021-10-23 05:24:25 发布
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分类专栏： 数据库 LeetCode
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本文链接：https://blog.youkuaiyun.com/ojshilu/article/details/44282789
本文介绍了一种SQL查询技巧，通过使用NOT IN来找出存在于客户表中但未在订单表中出现过的客户记录。

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Now we’ve got two table. One customer table for customerid and their names, One Order tablefor customers’ Id that bought something.
We will find the customers that in the customer table but not in order table.

Method

Use NOT IN.

select Name from Customers
where Id not in
(select CustomerId from Orders order by CustomerId);
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