Dax Filter

[Anonymous]

Hello, I tried to find a solutiuon for what I am trying to accomplish via this Forum and Youtube and I am grasping some concepts but unable to piece them together.  I have a column with data from different periods with associated values. I require a total of each period and then subtract those those totals. For instance Sum of 2020 P2 - Sum of 2020 P1. I am guessing that I have to use a Sum command and a Filter Command. 

Thank you for your assistance! 

[amitchandak · Accepted solution]

@Anonymous , Create a new period Table and create a rank on the period

Period Rank = RANKX(all('Period'),'Period'[Period],,ASC,Dense)
This Period = CALCULATE(sum('order'[Qty]), FILTER(ALL('Period'),'Date'[Period Rank]=max('Date'[Period Rank])))
Last Period = CALCULATE(sum('order'[Qty]), FILTER(ALL('Period'),'Date'[Period Rank]=max('Date'[Period Rank])-1))

Same approch I followed for week

Power BI — Week on Week and WTD
https://medium.com/@amitchandak.1978/power-bi-wtd-questions-time-intelligence-4-5-98c30fab69d3
https://community.powerbi.com/t5/Community-Blog/Week-Is-Not-So-Weak-WTD-Last-WTD-and-This-Week-vs-Last-Week/ba-p/1051123