Table number contains many numbers in column num including duplicated ones.
Can you write a SQL query to find the biggest number, which only appears once.

+---+

|num|

+---+

| 8 |

| 8 |

| 3 |

| 3 |

| 1 |

| 4 |

| 5 |

| 6 |

For the sample data above, your query should return the following result:

+---+

|num|

+---+

| 6 |

Note:
If there is no such number, just output null.

Code

SELECT MAX(num) as num FROM (SELECT num FROM number GROUP BY num HAVING COUNT(num) = 1) AS t

# note : have to has AS t

[LeetCode] 619. Biggest Single Number_Easy tag: SQL的更多相关文章

  1. [LeetCode] 620. Not Boring Movies_Easy tag: SQL

    X city opened a new cinema, many people would like to go to this cinema. The cinema also gives out a ...

  2. [LeetCode] 176. Second Highest Salary_Easy tag: SQL

    Write a SQL query to get the second highest salary from the Employee table. +----+--------+ | Id | S ...

  3. [LeetCode] 196. Delete Duplicate Emails_Easy tag: SQL

    Write a SQL query to delete all duplicate email entries in a table named Person, keeping only unique ...

  4. [LeetCode] 584. Find Customer Referee_Easy tag: SQL

    Given a table customer holding customers information and the referee. +------+------+-----------+ | ...

  5. [LeetCode] 603. Consecutive Available Seats_Easy tag: SQL

    Several friends at a cinema ticket office would like to reserve consecutive available seats.Can you ...

  6. 【一天一道LeetCode】#260. Single Number III

    一天一道LeetCode 本系列文章已全部上传至我的github,地址:ZeeCoder's Github 欢迎大家关注我的新浪微博,我的新浪微博 欢迎转载,转载请注明出处 (一)题目 Given a ...

  7. [LeetCode] 64. Minimum Path Sum_Medium tag: Dynamic Programming

    Given a m x n grid filled with non-negative numbers, find a path from top left to bottom right which ...

  8. 【LeetCode】137. Single Number II 解题报告（Python）

    [LeetCode]137. Single Number II 解题报告(Python) 标签: LeetCode 题目地址:https://leetcode.com/problems/single- ...

  9. [LeetCode] 181. Employees Earning More Than Their Managers_Easy tag: SQL

    The Employee table holds all employees including their managers. Every employee has an Id, and there ...

随机推荐

  1. Web（一）

    Tomcat 服务器       B/S 浏览器/服务器       C/S 客户端/服务器  URI :大 广 /项目名                      URL: 小  http://lo ...

  2. RabbitMQ----整理

    ------------------------------------------------------------------RabbitMQ-------------------------- ...

  3. MySQL主从同步添加至zabbix监控

    参考文档:https://blog.csdn.net/hellowidow_2020/article/details/78985368    https://www.cnblogs.com/cdjia ...

  4. nginx js、css、图片 及 一些静态文件中出现 http://upstreamname:port 导致部分网页样式显示不正常

    nginx js.css.图片 及 一些静态文件中出现 http://upstreamname:port 导致部分网页样式显示不正常 http://upstreamname:port/....../. ...

  5. LeetCode 112 Minimum Depth of Binary Tree

    Given a binary tree, find its minimum depth. The minimum depth is the number of nodes along the shor ...

  6. 体验 ASP.NET Core 集成测试三剑客：xUnit.net、TestServer、EF Core InMemory

    这是昨天解决的一个问题,针对一个 web api 的客户端代理类写集成测试,既要测试 web api,又要测试 web api 客户端. 测试 web api,就要在运行测试时自动启动 web api ...

  7. 微信、QQ群短文本聊天语料总结

    在文本分类任务中,语料的特性千差万别,我们需要找到适合模型并抓住数据的特性,最终才能得到较好的model.最近在文本类别标注任务,就是给文本打标签确定该文本的类别.这是一个很费人工的过程,需要认真仔细 ...

  8. 应用打开其xlspptdoc等

    http://www.libxl.com/documentation.html  xls读写编辑类库libxl https://blog.csdn.net/songbob/article/detail ...

  9. 创建ReactNative的iOS项目

    http://reactnative.cn/docs/integration-with-existing-apps/ 1.安装好ReactNative开发环境 2.安装好CocoaPods 3.创建项 ...

  10. Concurrent Execution

    Concurrent Execution — Python 3.7.2 documentation https://docs.python.org/3/library/concurrency.html