Find difference between two rows by usind Dax in Power BI

问题

I have three column one is Id(ID is same) 2nd col is amount and third is date, I want difference between two rows(amount)

回答1:

As you want to have the previous value of the date where the ID is equal, you can use the following:

Add a column,

Column4 = 
    var baseFilter = FILTER(DiffRows;DiffRows[Column1] = EARLIER(DiffRows[Column1]))
    var selectDate = CALCULATE(LASTDATE(DiffRows[Column3]);baseFilter; 
        FILTER(baseFilter; DiffRows[Column3] < EARLIER(DiffRows[Column3])))
 return 
     DiffRows[Column2] - CALCULATE(sum(DiffRows[Column2]);baseFilter; 
     FILTER(baseFilter; DiffRows[Column3] =selectDate))

First I create a basefilter to ensure the IDs are same. Next I select the date whcih is the previousdate within the set of same ids Last I use this date, to filter the correct value out of the rows.

End result:

来源：https://stackoverflow.com/questions/57710425/find-difference-between-two-rows-by-usind-dax-in-power-bi