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

select (
  select distinct Salary from Employee order by Salary Desc limit 1 offset 1
)as SecondHighestSalary;