I think this is common, is it?
If you have a table with SALES {Customer_ID, Price, SmallDateTime date}. How do you report all sales per month?
SALES {Customer_ID, Price, SmallDateTime date}
SELECT YEAR(date) as SalesYear, MONTH(date) as SalesMonth, SUM(Price) AS TotalSales FROM Sales GROUP BY YEAR(date), MONTH(date) ORDER BY YEAR(date), MONTH(date)