47-00176-second-highest-salary.sql

-- create a temp table to get max salary
-- pick the max salary from Employee table which is not in temp table

select max(salary) as SecondHighestSalary
from Employee
where salary not in
    (select max(salary)
    from Employee)
  
-----------------------------------------------------------------------------------------------------------

-- write a query to get offset 1 salary(skip first row)
-- but this won't give 'null' as answer
-- so write a simple select, and select that
  
  select(
        select distinct salary SecondHighestSalary
        from Employee 
        order by salary desc 
        limit 1 offset 1
    )  as SecondHighestSalary


-- amaazon- 2
-- adobe- 2
-- microsoft- 2
-- accencture- 2
-- google- 4
-- oracle- 3
-- tcs- 3
-- infosys- 2
-- yahoo- 2
-- apple- 2
-- mckinsey- 2
-- amdocs- 2