leetcode:176. second highest salary

题目描述

Write a SQL query to get the second highest salary from the Employee table.

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+----+--------+
| 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.

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+---------------------+
| SecondHighestSalary |
+---------------------+
| 200                 |
+---------------------+

查找第二大的元素，只需要在where语句中过滤掉最大的元素后再使用max即可

代码实现

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select max(Salary) as SecondHighestSalary from Employee where Salary < (select max(Salary) from Employee)