I have a fact table that contains monthly reporting dates (related to a date dimension). These monthly reporting dates are listed as columns in a pivot table and I currently have around 2 years data.
The business requirement is to create and as of date filter that would filter the columns down to 1 years data. For example, selecting 7/31/2013 would filter the columns down to 07/31/2012 - 07/31/2013. I'm not sure how to approach this.