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

.

# Write your MySQL query statement below
select MAX(Salary) as SecondHighestSalary from Employee
where Salary<(
select MAX(Salary)
from Employee);