> For the complete documentation index, see [llms.txt](https://zqt0.gitbook.io/leetcode/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://zqt0.gitbook.io/leetcode/sql/176.second-highest-salary.md).

# 176.(Easy)第二高的薪水

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                 |
+---------------------+
```

来源：力扣（LeetCode）

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

著作权归领扣网络所有。商业转载请联系官方授权，非商业转载请注明出处。

## Solution

去重、排序、嵌套（替换空表为null）

```sql
select
(
    select distinct Salary
    from Employee
    order by 1 desc
    limit 1,1
) SecondHighestSalary
```