We have a dataset of millions of records that are incidents from our city 911 dispatch system. We would like to be able to show a rolling number of months (e.g. 12) in data in bar and column charts. Right now we can only filter by year or month, and if we turn off the year filtering it stacks multiple years (see attached chart -- notice how January is more overall, because it's three months of data, vs the other months have only two). I know Tableau can do this -- in fact, I think it defaults to this in some way. I've attached an example Tableau chart I found that shows this.
