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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.

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())