Get the Second Highest Salary in MySQL

The problem

Write a SQL query to get the second highest salary from the Employee table.

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.

The solution

SELECT DISTINCT
    Salary AS SecondHighestSalary
FROM
    Employee
ORDER BY Salary DESC
LIMIT 1 OFFSET 1

The output

{"headers": ["SecondHighestSalary"], "values": [[200]]}