Write a SQL query to get the second highest salary from the Employee table.
+----+--------+ | Id | Salary | +----+--------+ | 1 | 100 | | 2 | 200 | | 3 | 300 | +----+--------+
For example, given the above Employee table, the query should return 200 as the second highest salary. If there is no second highest salary, then the query should return null.
+---------------------+ | SecondHighestSalary | +---------------------+ | 200 | +---------------------+
思路为先把最大的选出来, 然后把不等于之前的最大的, 最大的salary选出来即可.
SELECT max(Salary) as SecondHighestSalary FROM Employee WHERE Salary NOT IN (SELECT max(Salary) FROM Employee)
[LeetCode] 176. Second Highest Salary_Easy tag: SQL
原文：https://www.cnblogs.com/Johnsonxiong/p/9461908.html