Second highest salary

--
-- Table: Employee
-- +-------------+------+
-- | Column Name | Type |
-- +-------------+------+
-- | id          | int  |
-- | salary      | int  |
-- +-------------+------+
-- id is the primary key (column with unique values) for this table.
-- Each row of this table contains information about the salary of an employee.
-- Write a solution to find the second highest distinct salary from the Employee table. If there is no second highest salary, return null (return None in Pandas).
-- The result format is in the following example.
-- Example 1:
-- Input:
-- Employee table:
-- +----+--------+
-- | id | salary |
-- +----+--------+
-- | 1  | 100    |
-- | 2  | 200    |
-- | 3  | 300    |
-- +----+--------+
-- Output:
-- +---------------------+
-- | SecondHighestSalary |
-- +---------------------+
-- | 200                 |
-- +---------------------+
-- Example 2:
-- Input:
-- Employee table:
-- +----+--------+
-- | id | salary |
-- +----+--------+
-- | 1  | 100    |
-- +----+--------+
-- Output:
-- +---------------------+
-- | SecondHighestSalary |
-- +---------------------+
-- | null                |
-- +---------------------+
--

# Write your MySQL query statement below

SELECT MAX(salary) AS SecondHighestSalary
FROM Employee
WHERE salary < (SELECT MAX(salary) FROM Employee)