Math Operators with SQL Statements

Hello Pros -

Hope you are doing well.

I am running into an issue with writing a query that will do current year comparison to previous year. In my code below it stores current year month for beginning to end of month in separate variables. Than it also stores the same but for previous year. As you proceed, you will see the t-sql query that will display all stores, sales data, volume of transactions in cars, GPM, and ARO.


However, my conumdrum is how do I display an additional column that will do the operation of previous year for the month of January and than subtract, add, multiply or divide if need be and display only the sales data, car count, GPM and ARO? Is this possible?

I have attached a picture of the data results when I run the 2016 query below. Let know if you have any questions or you need me to verify.

DECLARE @begJan DATETIME, @endJan DATETIME, @begJanPrev DATETIME, @endJanPrev DATETIME
SET @begJan = '01/01/2016'
SET @endJan = '01/31/2016'
SET @begJanPrev = '01/01/2015'
SET @endJanPrev = '01/31/2015'


select 

B.store_Num as [Store Name],
A.store_UIN as [Store Code],
B.store_Name as [Store Name],
FORMAT(SUM(total-tax), 'C', 'en-us') AS [Sales],
COUNT(RO_NO) as [Car Count],
FORMAT((((SUM(TAX_PARTS + NTX_PARTS + TAX_LABOR + NTX_LABOR + TAX_SUBLET + NTX_SUBLET - DISP - DISL -DISS)) - (SUM(P_COST + T_COST))) / (SUM(TAX_PARTS + NTX_PARTS + TAX_LABOR + NTX_LABOR + TAX_SUBLET + NTX_SUBLET - DISP - DISL -DISS))), 'P', 'EN-US') as [GPM],
FORMAT(((SUM(TAX_PARTS + NTX_PARTS + TAX_LABOR + NTX_LABOR + TAX_SUBLET + NTX_SUBLET + SUPPLIES - DISP - DISL -DISS)) / (COUNT(RO_NO))), 'C', 'EN-US') as [ARO],


from HRO as A
left JOIN StoreInfo as B
  ON A.store_UIN = B.store_UIN

where
( PAY_DATE >= @begJan) And (PAY_DATE <= @endJan) and Status IN ('C','Q')  


group by B.store_Num, A.store_UIN, B.store_Name, B.store_OpeningDate, B.store_UIN

order by B.store_Num, A.store_UIN asc

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