Second Highest Salary

Question

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

    | Id | Salary |
    | 1  | 100    |
    | 2  | 200    |
    | 3  | 300    |
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Answer 1

select case 
when cnt>1 then SecondHighestSalary
else null end as SecondHighestSalary
from 
(select top 1 Salary as SecondHighestSalary,
(select count(distinct Salary)  from Employee) as cnt 
from (
select distinct top 2 Salary 
from Employee
order by Salary desc ) as sal
order by SecondHighestSalary asc) as b