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. Linux 磁盘管理命令

    df NO1. 显示所有存储系统空间使用情况,同时显示存储系统的文件系统类型s[root@rehat root]# df -aT NO2. 显示指定文件系统的空间使用情况[root@rehat roo ...

  2. 非节点主机通过内网远程管理docker swarm集群

    这是今天使用 docker swarm 遇到的一个问题,终于在睡觉前解决了,在这篇随笔中记录一下. 在 docker swarm 集群的 manager 节点上用 docker cli 命令可以正常管 ...

  3. 关于html中input组件间空隙的去除

    有空隙的时候的代码是这样的: <input type="text" name="search" title="请输入要搜索的内容" s ...

  4. Deck of Cards ZOJ - 2852 dp 多决策 三维 滚动更新

    题意:一个特殊21点游戏 具体http://acm.zju.edu.cn/onlinejudge/showProblem.do?problemCode=2852 题解:建一个三维dp,表示三个卡槽分别 ...

  5. B. Salty Fish Go! -期望题(瞎搞题)

    链接:https://www.nowcoder.com/acm/contest/104/B来源:牛客网 题意:A few days ago, WRD was playing a small game ...

  6. python-----实现接口自动化测试(实例4)

    实现接口自动化测试1.读取case---从测试用例Excel表格中读取接口请求数据2.调用接口---发送请求获取实际结果3.校验结果---实际结果与预期结果对比4.结果写入表格---将实际结果与测试状 ...

  7. rtd1296 mtd 设备驱动分析

    mtd 分区一般采用3种方式实现 1.内核写死  mtd_partition 2.u-boot 传参 为了使kernel能够解析mtdparts信息,我们需要将内核中的Device Drivers - ...

  8. python3元组,列表的几个属性

    list1 = ['a', 'b', 'c', 'a'] tuple1 = ('a', 'b', 'c', 'a') 计算list1或者tuple1中元素的个数:  count_a = list1.c ...

  9. swift中 ?和 !的区别

      可选类型(?)与强制解析运算符(!) ?是一种判断后再拆包的语法糖 !是一种强制拆包的语法糖   当你不确定有值的时候就可以用  ? 当你确定有值的时候可以用  !     ?的几种使用场景:1. ...

  10. C# Asp.net中xml串与对象互相转换

    public class XmlUtil { #region 反序列化 /// <summary> /// 将XML字符串反序列化为对象 /// </summary> /// ...