176 - 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.

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思路分析：

解法一：

select Max(Salary) from Employee where Salary < (select Max(Salary) from Employee)

解法二：

SELECT (SELECT DISTINCT Salary FROM Employee ORDER BY Salary DESC LIMIT 1,1)