Sum of last year sales to current calendar month

[#1]

Hi,

I am looking to create a table, with product category as the dimension, that will include a column for the sum of all sales of each product in the previous year only including months up to the latest calendar month in the data for this year. So if the most recent date in the entire dataset is July 2016, then the column would sum sales for each product from January through to July 2015.

My data looks like this:

Posting Date	Category	Total Value
04/01/2015	Storage	730
11/01/2016	Training	235
...	...	...

And my LOAD script like:

Spend:

LOAD

Month(Date([Posting Date])) as [Posting Month],

Year(Date([Posting Date])) as [Posting Year],

[Total Value],

Category

FROM <filepath...>

I attach a data set that contains these data fields.

Desired outcome is:

Category	Sum Sales in 2016	Sum sales in same months in 2015
Storage	£X	£A
Training	£Y	£B
...	...	...

Any help would be greatly appreciated