Forum Discussion
Helper I2 date fields in different table
having a calendar table makes your life much easier (because you get to use the time intelligence functions)
you can do those calculations without it but you'll have to write a bit more
look here at this link provided by Matt
http://www.powerpivotpro.com/2015/02/create-a-custom-calendar-in-power-query/
Helper II am sure it will work if I create a table with the field "date" and add all dates in it but it does't make sense.
At that point, I would prefer to add a column in YTD table called forecast and paste the Forecast data in it.
I tried that too by doing that but again it add all the total impression forecasted as a total...
Imp_Served = SUM(Forecast[Forecasted impressions])
Community ChampionIt actually does make absolutely 100% sense if you understand that DAX and Power BI are all about context. As I explained above, you need a common context filter, otherwise the aggregation is going to get absolutely everything in the other table and just SUM it, etc. You could also relate your Date in Forecast to your Date in Impressions and then use the Date from Impressions as that provides the same, common context for calculations.