Variable line by line computation based on value in second table

[Lecram36]

Hi 

Need some help here ... Tryitng to compute a "Currency Impact". Given a "base" table with, say, sales in local currency, and an exchange rate; given a "fxrate" table that is sliced to filter to a unique reference, how can I compute line-by-line and get the total ? The formula needs to be efficient, because there are easily 500'000 rows in "base". Not easy to explain the issue, so I made a little drawing! Any help is higly appreciated ...

[v-lili6-msft · Accepted solution]

HI @Lecram36 

First, you should know that:

1. Calculation column/table not support dynamic changed based on filter or slicer.
2. Measure can be affected by filter/slicer, so you can use it to get dynamic summary result in a visual.

https://www.sqlbi.com/articles/calculated-columns-and-measures-in-dax/

Second, for your case, you could try this way as below:

Step1:

Create a relationalship between Datatable and FXTable by Currency column.(This relationship will be many to many)

Step2:

Then create a measure as below:

Impact = 
SUMX('Data Table', CALCULATE(SUM('Data Table'[Sales])-SUM('Data Table'[Sales])*DIVIDE(SUM('Data Table'[FxRate]),SUM(FXTable[RefFxRate]))))

Result:

and here is sample pbix file, please try it.

Regards,

Lin

[parry2k]

@Lecram36 Based on your data table, it should be something like this, add as a column

Sales Impact = 
Table[Sales] - ( DIVIDE ( ( Table[Sales] * Table[FxRate] ), Table[RefFxRate] ) )

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[Lecram36]

@parry2k  Nope, unfortunately not that simple: Table[RefFxRate] is not available. It's in the excel sheet for the demo of the calculation, but it's an external value computed 'on the fly'

[parry2k]

@Lecram36 

ok then you have to share your data the way it look and the model/relationship diagram.