这样做是取表中第二个数字为空时,即表中只有一个数字,或者全部数字都是一样的并列第一,无法返回空值 SELECT(SELECTDISTINCTSalaryFROMEmployeeORDERBYSalaryDESCLIMIT1OFFSET1)ASsecondHighestSalary
+---+---+ For example, given the above Employee table, the second highest salary is200. If there is no second highest salary, then the query should returnnull. https://leetcode.com/problems/second-highest-salary/ 首先MySQL不支持top语法,要用limit代替。 selectSalaryfromEmployeeorderbySalarydes...
limit 1,1),null) as SecondHighestSalary 学到了一个sql函数IFNULL,该函数的作用是判断查询结果集是否为空,若为空则返回第二个参数 还有一种做法,直接用两个select解决 select(select distinct(Salary) from Employee order by(Salary) desc limit 1,1) as SecondHighestSalary...
NOT IN the first SubQuery --- get rid of the top max value as Answer 1 did, and the second SubQuery is just the Answer 1 itself NOT IN the second SubQuery --- get rid of the second max value Therefore, we got the third-highest salary, however, with quite complex logic --- th...
试了下，不需要加ifnull也可以通过， select max(distinct Salary) as SecondHighestSalary from Employee where Salary < (select max(distinct Salary) from Employee);核心
In this article, I am going to explain to you how to find the second highest salary in various ways. This is one of the most common questions asked in an SQL interview. Below are the several ways of finding the Nth highest salary: How to find the second highest salary in SQL Server ...
1. 2. 题目解析: SELECT max(Salary) FROM Employee WHERE Salary < (SELECT max(Salary) FROM Employee) Using max() will return a NULL if the value doesn't exist. So there is no need to UNION a NULL. Of course, if the second highest value is guaranteed to exist, using LIMIT 1,1 wil...
NULL) AS SecondHighestSalary 知识点总结: limit offset 使用 SELECTcolumn_list选择要读取的列名 FROM table1 选择表名 ORDER BY column_list 排列顺序 LIMITrow_count OFFSET offset 读取列数为 row count, offset 为跳过多少列 图片来自https://www.sqltutorial.org/sql-limit/ ...
5. 6. 7. For example, given the above Employee table, the second highest salary is200. If there is no second highest salary, then the query should returnnull. 解决方案如下: # Write your MySQL query statement below select max(Salary) ...
ROW_NUMBER() and select = 2