[MySQL习题] 第二高薪水 Second Highest Salary

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本文介绍了一种使用SQL查询来获取员工表中第二高薪水的方法。通过先找到最高薪水，然后再寻找次高的薪水来实现这一目标。示例展示了具体的SQL语句。

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                 |
+---------------------+

解题思路

（1）找出最大的薪水A，
（2）找出小于A的最大薪水。

实现代码

select max(Salary) as SecondHighestSalary
from Employee
where Salary < (select max(Salary) from Employee);
#或者where Salary not in (select max(Salary) from Employee);