topic Re: Convert Tableau function WINDOW_SUM into DAX in DAX Commands and Tips

Convert Tableau function WINDOW_SUM into DAX

Anonymous — Tue, 28 Feb 2023 21:35:33 GMT

Hello,

I would like to convert the below Tableau expression into DAX:

WINDOW_SUM(sum([values]), -DATEDIFF('day',DATE('1/4/'+str(year(DATEADD('month',-3,attr([Date]))))),attr([Date])),0)

Re: Convert Tableau function WINDOW_SUM into DAX

Greg_Deckler — Tue, 28 Feb 2023 21:48:10 GMT

Anonymous What does WINDOW_SUM do?

Re: Convert Tableau function WINDOW_SUM into DAX

Anonymous — Tue, 28 Feb 2023 21:51:29 GMT

Greg_Deckler , here is a link and extract:

https://help.tableau.com/current/pro/desktop/en-us/functions_functions_tablecalculation.htm

Re: Convert Tableau function WINDOW_SUM into DAX

Anonymous — Tue, 28 Feb 2023 22:01:09 GMT

Greg_Deckler ,
As I understand this formula, it starts summing up values on 1 April and restarts every year on the same date.
The first value is of 1 April, the second value is of 2 April + 3 April, the third value is of 3 April +4 April+5 April and so on.

Re: Convert Tableau function WINDOW_SUM into DAX

Greg_Deckler — Tue, 28 Feb 2023 23:11:38 GMT

Anonymous Maybe:

Cumulative April 1 = VAR __Date = MAX('Table'[Date]) VAR __Year = IF(MONTH(__Date) < 4, YEAR(__Date) - 1 , YEAR(__Date)) VAR __Table = FILTER(ALL('Table'), [Date] <= __Date && [Date] >= DATE(__Year, 4, 1)) VAR __Result = SUMX(__Table, [Values]) RETURN __Result

Re: Convert Tableau function WINDOW_SUM into DAX

Anonymous — Tue, 28 Feb 2023 23:56:56 GMT

Greg_Deckler The formula works as a cumulative total. There window element is not there.

Re: Convert Tableau function WINDOW_SUM into DAX

Greg_Deckler — Wed, 01 Mar 2023 00:47:17 GMT

Anonymous Right, the formula I provided is a cumulative total that resets on April 1st. There is a new WINDOW function in DAX. It's sort of kind of supposed to work at a "visual" level but that's not really how it works.

If you want a cumulative total that resets on April 1st, the formula I provided should work. It dynamically creates the "window" in the __Table VAR.