【leetcode】database Second Highest Salary

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 second highest salary is

200

. If there is no second highest salary, then the query should return

null

.

问题很简单，就是要select 出第二大的Salary。

我的思路就是：

先找出最大的Salary，然后在找出不等于最大Salary的最大Salary，也就是第二大的Salary。

一次AC，表示高兴。

SELECT MAX(Salary)
FROM Employee
WHERE Salary != (SELECT MAX(Salary) FROM Employee);

一次AC，还是比较意外的。