LeetCode数据库176

题目链接

https://leetcode-cn.com/problems/second-highest-salary/

题解

注意几个sql语句的用法即可。

ifnull、desc、limit offset的用法见：https://www.cnblogs.com/OFSHK/p/14636382.html

AC代码

select ifnull(
(select distinct Salary from Employee
order by Salary desc
limit 1 offset 1),null) as SecondHighestSalary;