SQL OVER

USE AdventureWorks2012;
GO
SELECT BusinessEntityID, TerritoryID 
   ,DATEPART(yy,ModifiedDate) AS SalesYear
   ,CONVERT(varchar(20),SalesYTD,1) AS  SalesYTD
   ,CONVERT(varchar(20),AVG(SalesYTD) OVER (PARTITION BY TerritoryID 
                                            ORDER BY DATEPART(yy,ModifiedDate) 
                                           ),1) AS MovingAvg
   ,CONVERT(varchar(20),SUM(SalesYTD) OVER (PARTITION BY TerritoryID 
                                            ORDER BY DATEPART(yy,ModifiedDate) 
                                            ),1) AS CumulativeTotal
FROM Sales.SalesPerson
WHERE TerritoryID IS NULL OR TerritoryID < 5
ORDER BY TerritoryID,SalesYear;