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Flori_Abb
Helper I
Helper I

DAX Switch function with two variables

Dear all

 

just to collect some thoughts if that is a good way or if this formula will slow down my pbi report in future...

I have two calculated values (Revenue/Units) and a calculated average (ASP). The user can choose from a button which value he wants to see. That works fine and fast with the switch function if i have one variable sum. Now i want to add targets as a second dimension, so i created the following formula:

var_Act vs. Target % = Switch( True();
values(dim_measureswitch[Measure]) = "Revenue"; [var_month_line_chart LC]/[var_Target LC]-1;
values(dim_measureswitch[Measure]) = "Units"; [var_month_line_chart LC]/[var_Target LC]-1;
values(dim_measureswitch[Measure]) = "ASP"; [var_month_line_chart LC]/[var_Target LC]-1;
blank())

 

var_Target LC = Switch( True();
values(dim_measureswitch[Measure]) = "Revenue"; [Target Sales LC];
values(dim_measureswitch[Measure]) = "Units"; [Target Unit];
values(dim_measureswitch[Measure]) = "ASP"; divide([Target Sales LC];[Target Unit];0);
blank())

 

var_month_line_chart LC = Switch( True();
values(dim_measureswitch[Measure]) = "Revenue"; ([Sales Revenue LC]-[MTD Sales Revenue LC])+ [MTD Sales Revenue LC RR CD];
values(dim_measureswitch[Measure]) = "Units"; ([Sales Units]-[MTD Sales Units])+ [MTD Sales Units RR];
values(dim_measureswitch[Measure]) = "ASP"; divide(([Sales Revenue LC]-[MTD Sales Revenue LC])+ [MTD Sales Revenue LC RR CD];([Sales Units]-[MTD Sales Units])+ [MTD Sales Units RR];0);
blank())

 

 

As you see i have now two variables (one with revenue (var_month_line_chart) and one with targets (var-target LC). That works fine, but the speed is decreasing. 

What do you think is this the right way or is there a more efficient way to do this calculation?

KR

Florian

2 REPLIES 2
v-huizhn-msft
Microsoft Employee
Microsoft Employee

Hi @Flori_Abb,

From what I know, your formulas are nice, it's normal to run lower after you add more variables. I will post the update when I find more efficient way.

Best Regards,
Angelia

Hi @Flori_Abb

 

Not so much a performance tip, but I'd recommend using the DIVIDE function for your division maths.

 

so rather than 

 

z = x / y

use

 

z = DIVIDE(x,y,0)

In terms of performance, can you preaggregate or precalculate some of your data upstream of Power BI?  eg in the Query Editor or in your data source?


To learn more about DAX visit : aka.ms/practicalDAX

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