Substract two metrics conditionally

[BICons]

Hello,

I have two metrics, one of this is Current sales and the other is Previous year sales, I need to subtract this two metrics depending on wheather Current Sales > 0 && Previous year sales > 0 or not. Te problem is that the total is showing 0 because it is comparing the total sales and the previous Year sales Total, while what I want is the sum of each rows.
This is the way I am calculating in DAX:

Churn = IF([SumTotalSales] = 0 && [SumTotalSalesPreviousYear] > 0,  [SumTotalSalesPreviousYear], 0)
This is the table that I have which is not what I want:

I have tried with these other two metrics:
1.- 

Churn = SUMX(

    VALUES('Calendar'[Año]),

    IF([SumTotalSales] = 0 && [SumTotalSalesPreviousYear] > 0, [SumTotalSales] - [SumTotalSalesPreviousYear],0))

2.- 

Churn2 =

SUMX(

    ADDCOLUMNS(

        'Sales',

        "Total",

        IF(

            [SumTotalSales] = 0 && [SumTotalSalesPreviousYear] > 0,

            [SumTotalSales] - [SumTotalSalesPreviousYear],

            0

        )

    ),

    [Total]

)

But again they don't work.

Thank you for your help!

Regards!!

[Greg_Deckler · Accepted solution]

@BICons First, please vote for this idea: https://ideas.powerbi.com/ideas/idea/?ideaid=082203f1-594f-4ba7-ac87-bb91096c742e

This looks like a measure totals problem. Very common. See my post about it here: https://community.powerbi.com/t5/DAX-Commands-and-Tips/Dealing-with-Measure-Totals/td-p/63376

Also, this Quick Measure, Measure Totals, The Final Word should get you what you need:
https://community.powerbi.com/t5/Quick-Measures-Gallery/Measure-Totals-The-Final-Word/m-p/547907

Also: https://youtu.be/uXRriTN0cfY
And: https://youtu.be/n4TYhF2ARe8

[Anonymous · Accepted solution]

Thanks for the reply from Greg_Deckler , please allow me to provide another insight:

Hi, @BICons .

Regarding the issue you raised, my solution is as follows:

1.First I have created the following table and the column names and data are the data you have given:

2.Create calculated column references:

Column = IF([SumTotalSales]=0&&'Table'[SumTotalSalesPreviousYear]>0,[SumTotalSales]-[SumTotalSalesPreviousYear])

3. Below are the measure I've created for your needs:

Measure = CALCULATE(SUM('Table'[Column]),ALLSELECTED('Table'))

4.Here's my final result, which I hope meets your requirements.
 

Please find the attached pbix relevant to the case.

Best Regards,

Leroy Lu

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

[Greg_Deckler · Accepted solution]

@BICons First, please vote for this idea: https://ideas.powerbi.com/ideas/idea/?ideaid=082203f1-594f-4ba7-ac87-bb91096c742e

This looks like a measure totals problem. Very common. See my post about it here: https://community.powerbi.com/t5/DAX-Commands-and-Tips/Dealing-with-Measure-Totals/td-p/63376

Also, this Quick Measure, Measure Totals, The Final Word should get you what you need:
https://community.powerbi.com/t5/Quick-Measures-Gallery/Measure-Totals-The-Final-Word/m-p/547907

Also: https://youtu.be/uXRriTN0cfY
And: https://youtu.be/n4TYhF2ARe8