Forum Discussion

axk180022's avatar
axk180022
Helper II
4 years ago
Solved

Calculate Difference between 2 rows based on another column filter

  I would want to find the difference in the GenHours for each serialid. Currently this is how my table looks on power BI. I have filtered the latest and 2nd latest date for each serialid.   ...
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  • Ashish_Mathur's avatar
    Ashish_Mathur
    4 years ago

    Hi,

    This calculated column formula works

    =if(CALCULATE(MAX(Data[Dates]),FILTER(Data,Data[serialid]=EARLIER(Data[serialid])))=Data[Dates],ABS(Data[GenHours]-LOOKUPVALUE(Data[GenHours],Data[Dates],CALCULATE(max(Data[Dates]),FILTER(Data,Data[serialid]=EARLIER(Data[serialid])&&Data[Dates]<EARLIER(Data[Dates]))),Data[serialid],Data[serialid])),BLANK())

    Hope this helps.

axk180022's avatar
axk180022
Helper II
4 years ago

Since Im a new user im unable to upload the above data. is there a link you can provide me?

richbenmintz 

richbenmintz's avatar
richbenmintz
Resident Rockstar
4 years ago

Hi axk180022 ,

 

You can paste the data in a table, or share your pbix through google drive or onedrive

  • axk180022's avatar
    axk180022
    Helper II
    4 years ago
    serialidGenHoursDates
    cvs-001 30012/1/2019
    cvs-001 2001/2/2020
    cvs-001 2002/2/2020
    cvs-002 8004/3/2020
    cvs-002 3005/3/2020
    cvs-002 4006/3/2020
    cvs-003 2505/5/2020
    cvs-004 8205/2/2020
    cvs-004 3506/6/2020
    cvs-004 1506/7/2020

     

    Here is the table richbenmintz 

    • richbenmintz's avatar
      richbenmintz
      Resident Rockstar
      4 years ago

      Hi axk180022 

       

      If you create a calc column that get the prior date value like

      Prior Date Value = 
var _serialid = [serialid]
var _date = [Dates]
return
CALCULATE(MAX('Table'[GenHours]), TOPN(1, FILTER('Table', [serialid] = _serialid && [Dates]<_date), 'Table'[Dates], DESC))

      you can create another column that derives the difference

      diff = [GenHours] - [Prior Date Value]

      hope this helps

       

      • richbenmintz's avatar
        richbenmintz
        Resident Rockstar
        4 years ago

        Hi axk180022,

         

        See Formula Below, combined logic into single column and set value to blank when not the max date per serial number

         

        Difference = 
var _serialid = [serialid]
var _date = [Dates]
return

if('Table'[Dates] = CALCULATE(MAX('Table'[Dates]), filter(ALL('Table'),'Table'[serialid] = _serialid)),
abs('Table'[GenHours] - 
    CALCULATE(MAX('Table'[GenHours]), 
        TOPN(1, FILTER('Table', [serialid] = _serialid && [Dates]<_date), 'Table'[Dates], DESC))
    )
    , BLANK())