Highest Salary in each department

Question

I have a table EmpDetails:

DeptID      EmpName   Salary
Engg        Sam       1000
Engg        Smith     2000
HR          Denis     1500
HR                  


        

Answer 1

with ctesal as (
 select DepartmentId , Name , Salary, ROW_Number() OVER (partition by DepartmentId 
 order by Salary desc) as RowNum
 from dbo.Employee
 )
 select DepartmentId , Name , Salary , RowNum from ctesal where RowNum  =2;

This is applicable to SQL server. ROW_Number is a inbuilt function in SQL server .It gives count starting from 1 based on partition by and order by clause. At the end, We can write where condition based on our requirements.