176 - 第二高的薪水

题目描述

SQL架构

编写一个 SQL 查询，获取 Employee 表中第二高的薪水（Salary）。

+----+--------+
| Id | Salary |
+----+--------+
| 1  | 100    |
| 2  | 200    |
| 3  | 300    |
+----+--------+

例如上述 Employee 表，SQL查询应该返回 200 作为第二高的薪水。如果不存在第二高的薪水，那么查询应返回 null。

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

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

题解

# Write your MySQL query statement below
SELECT
    (SELECT DISTINCT Salary
    FROM Employee
    ORDER BY Salary DESC
    LIMIT 1 OFFSET 1)
AS SecondHighestSalary;