Measure to Sum Joined Tables

[soldstatic]

I have my data model set up with a customer table and an eventtable. Multiple customers go to each event, and events have different durations. I want to sum up the total minutes that customers are at events. In SQL I could do:

select sum(duration)
from Events E
join CustomerEvents CE on E.id = CE.EventID

Because the join would duplicate rows for each event to show one record per combination of event and customer, this should work. 

How do I do the same thing in PBI? I tried sumx(CustomerEvents,sum(Events[Duration])) and it isn't giving me the correct number.

Thanks in advance!

Andy

[az38]

@soldstatic hi

you need set up relationships between tables by ID field, then just create a measure like CALCULATE(SUM(Events[Duration]))

[soldstatic]

The relationships are already set up. They are 1-*, and only cross filter one direction for necessity. There are other relationships involved, so the actual calculate measure I am using has more to it than this, but I am currently using something like this:

measure = 
calculate(
  sumx(CustomerEvents,sum(Events[Duration]))
  ,crossfilter(CustomerEvents,Events,both)
)

This doesn't result in the correct answer. Here's why:

Sum(Events[Duration]) = 392
Countrows(CustomerEvents) = 38
sumx(CustomerEvents,sum(Events[Duration])) = 14,896
sumx(CustomerEvents,sumx(Events,[Duration])) = 14,896

 So what this is doing is giving me 392*38 as the answer, when that is not correct. I need the durations to be spread out / weighted by how many customers attended each event. The correct answer is 1,305 when calculated correctly using the join method above in SQL, but I can't get that to happen in PBI.

[v-eachen-msft · Accepted solution]

Hi @soldstatic ,

You don't need to sum it twice. Please refer to the following measure:

Measure =
CALCULATE (
    SUM ( Events[Duration] ),
    NATURALINNERJOIN ( 'Events', 'CustomerEvents' )
)