cancel
Showing results for 
Search instead for 
Did you mean: 
Reply
Ffitzpatrick47 Helper II
Helper II

Window functions which I never got to work in Dax

I have a table here:

image.png

I'd like to make power pivot that looks at the value at a prior time even if there isn't a value in the current time

I used:

srev = sum(value)

prev=CALCULATE([srev],filter(all(Table1[time]),Table1[time]=max(Table1[time])-1))

And got:

image.png

b.prev at 2 = 4 which is the same as srev at 1.  

a.prev at 2 is blank because there is no row at 2.  But there is a prev value at 2.  It should be 3.  So what's the right equation.

 

Also I'd like another equation that equals 1 when prev is 1 and srev = 0 grouped by company.  Then the grand total should be = 1 in time 2 because a should have been 1 in time 2 and b should be 0.  I did:

countx = sumx(addcolumns(summarize(table1,table1[customer]),"srev",[srev],"prev",[prev]),if([srev]>0&&prev=0,1,0)))

This didn't work because the addcolumns thingy showed blanks for both srev and prev.  

2 REPLIES 2
Highlighted
Ffitzpatrick47 Helper II
Helper II

Re: Window functions which I never got to work in Dax

I should mention a solution like this:

https://forum.powerpivotpro.com/forums/topic/when-blank-isnt-aka-help-with-autoexist-addmissingitems...

 

Wouldn't work because I actually do need to know the difference between a blank and a 0 in real life.

Microsoft
Microsoft

Re: Window functions which I never got to work in Dax

@Ffitzpatrick47,

For PowerPivot solutions, please post the question in PowerPivot forum to get dedicated support.

For Power BI solutions, please firstly create a Time table as below. Create relationship between Time table and your original table.
1.PNG

Then create the following measure in your original table.

srve = SUM(Table1[value])+0
prev = CALCULATE([srve],filter(ALL('Time'),'Time'[Time]=max('Time'[Time])-1))


At last, create a Matrix visual as follows, please note that , it is not possible to put measures into Rows of Matrix.
2.PNG

For your second requirement, please check if measure and measure2 in attched PBIX file return the correct result, if not, please post expected result based on the sample data.

Regards,
Lydia

Community Support Team _ Lydia Zhang
If this post helps, then please consider Accept it as the solution to help the other members find it more quickly.

Helpful resources

Announcements
Announcing the New Spanish Forum

Announcing the New Spanish Forum

Do you need help in Spanish? Check out our new Spanish community section.

April 2020 Community Highlights

April 2020 Community Highlights

Info on our Super Users, MBAS content and badges, and updates to our support articles. - Read the full Community Highlights.

MBAS Gallery 2020

MBAS Gallery 2020

Watch Microsoft Business Applications Summit sessions on-demand.

Top Solution Authors
Top Kudoed Authors