How to get second-highest salary employees in a table

- Method 1

    select max(salary) from Employees

        where salary < (select max(salary) from Employees)

 - Method 2

 select MAX(salary) from Employees

    where salary not in(select MAX(salary) from Employees)

 - Method 3

select MAX(salary) from Employees

    where salary != (select MAX(salary) from Employees )

-Method 4

SELECT salary from Employee ORDER BY salary DESC LIMIT 1, 1;