Sum 2 rows if ID and subtract from ID columns match?

[alya1]

Hello, 
I have table as below:

ID	Amount	Subtract from ID
1	-100	3
2	200
3	300
4	-50	2
5	-10	3

Can I get to the goals table below in power bi? 
Goals:

ID	Amount	Subtract from ID	Final
1	-100	3	0
2	200		150
3	300		50
4	-50	2	0
5	-150	3	0

[Anonymous · Accepted solution]

Hi, @alya1 

Based on your description, I created a measure using the following DAX:

Result =
VAR _ID =
    SELECTEDVALUE ( 'Table'[ID  ] )
VAR _table =
    SUMMARIZE (
        ALL ( 'Table' ),
        'Table'[ID  ],
        'Table'[Subtract from ID  ],
        'Table'[Amount  ]
    )
VAR _amount =
    SELECTEDVALUE ( 'Table'[Amount  ] )
VAR _blank =
    FILTER ( _table, 'Table'[Subtract from ID  ] = _ID )
RETURN
    IF (
        _ID IN SELECTCOLUMNS ( _blank, 'Table'[Subtract from ID  ] ),
        _amount + SUMX ( _blank, 'Table'[Amount  ] ),
        0
    )

 Put the corresponding column and this measure in the table visual, and the result is as follows:

I've provided the PBIX file used this time below.

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If it does not help, please provide more details with your desired output and pbix file without privacy information (or some sample data) .

Best Regards

Jianpeng Li

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[alya1]

Hi Jianpeng, thank you so much for the clean and effective DAX! 
May I ask you to please explain the steps please? specifically VAR _table and the RETURN line please.

[Anonymous]

Hi, @alya1 

Thank you very much for your reply. First_ID returns the ID of the current table visual row, _amount something similar:

_table generates a table of variables that looks like this:

_blank returns a table of variables that contains only the current _ID. Finally, use the SELECTCOLUMNS method to select the ID column of the _blank table, and then determine whether the _ID of the current row is in this column. If the current ID is in this table, then the amount corresponding to the current ID + the amount that matches it. That's what you're looking for.

Best Regards

Jianpeng Li

If this post helps, then please consider Accept it as the solution to help the other members find it more quickly.

[alya1]

Thank you Jianpeng!!