Running total wih constant numbers T-SQL - tsql

Question

I have data looks like this
MILEAGE January February ........December
0 0 0
2 0.066 0.052
3 0.081 0
5 0 0.062
6 0.080 0 .........
813 0 0 and so on
I want the data to look like this
Mileage January February ..... December
0 (Total of Mileage less and equal to zero for each month)
2000 Total of Mileage upto 2000 for each month
4000 Total of Mileage upto 4000 for each month
6000 Total of Mileage upto 6000 for each month
8000 and so on....
10000
12000
14000
2 thousand increment up till
50000
Thank you very much for your help. I am using SQL Server 2008 R2 and not sure how to achieve this

Answer 1

You can use a recursive CTE to make the table that lists the values on the fly as I show below. HOWEVER, you would only want to do this if it was an ad-hoc once in a while thing. If you are going to do it often (say every month) just make the table like you would make any other table and then you can add an index and join to it.
The most common way thing to do is to have a counting table 0, 1, 2, 3 etc up to some large number. Then you could get your result with SELECT val*2000 FROM counting_table WHERE val*2000 >= 5000. This counting table can be reused for many similar cases but is general purpose.
WITH mile_table as
(
-- use recursive cte to make a table with number 0 - 50000 by 2000
SELECT 0 as milage
UNION ALL
SELECT mile_table.milage+2000
FROM mile_table
WHERE mile_table.milage+2000 <= 50000
)
SELECT mile_table.milage,
sum(a.January) as January,
sum(a.February) as February,
--- ....
sum(a.December) as December,
FROM mile_table
JOIN your_table a ON a.milage >= mile_table.milage
GROUP BY mile_Table.milage

Answer 2

Try out something like this:
DECLARE #i as INT = -2000
CREATE TABLE #T
(
MileageFrom INT,
MileageTo INT
)
WHILE (#i <=50000)
BEGIN
INSERT INTO #T
values(#i, #i+2000)
SET #i= #i+2000
END
SELECT
A.MileageTo,
SUM(January) as january,
SUM(Feburary) as Feb ....,
SUM(DEC) as DEC
FROM YourTable A
JOIN #T B ON A.Mileage BETWEEN B.MileageFrom and B.MileageTo
You need to just tweak a bit the MileageFrom value to include all the values less than -2000