DAX calculation

[quyen103]

Hello friends,

I hope someone can help me out with this problem.  I don't know how I can implement this calculated column in PowerBI.

Should I use DAX? calculated function? data modelling? should I do this in ETL instead of Power BI?

Please see exhibit A below.   

I have a column (Column3) that needs to be calculated by two other columns from a previous row.  Previous row is denoted by smaller value in Column 0

Not only that, the calculated column would restart for each group of Column 0, so previous row actually gets restart whenever column 0 is 1 again.  I can add another column to denote each group of rows. (for rows with Column0 1-3)

Any pointers is greatly appreciated!  Thank you!

Column 0	Column 1	Column2	Column3 = ( Column 1 + Column 2 ) of previous row Restart previous row value when Column 0 value is 1
3	60	600	= 50+500 = 550
2	50	500	= 40 + 400 = 440
1	40	400
3	30	300	= 20+200 = 220
2	20	200	= 10 + 100 = 110
1	10	100

[Sean · Accepted solution]

@quyen103

Add an Index Column in the Query Editor as shown in the image below...

Then create this COLUMN

Column 3 =
VAR CurIndex = 'Table'[Index]
RETURN
    IF (
        'Table'[Column0] = 1,
        BLANK (),
        CALCULATE (
            SUM ( 'Table'[Column1] ) + SUM ( 'Table'[Column2] ),
            FILTER ( 'Table', 'Table'[Index] = CurIndex + 1 )
        )
    )

Hope this helps!

[quyen103]

Sean,

Thank you so much my friend, super contributor Sean 🙂

I really appreciate the video and code response.  Can't get any clearer than this.. !!

[v-huizhn-msft]

Hi @quyen103,

Please mark the right reply as answer. which will help more people to find solution.

Best Regards,
Angelia