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Regular Visitor
Posts: 20
Registered: ‎07-17-2017

# Sum of to many on different tables

[ Edited ]

hello all

I thought it would be a simple calculation but apparantly it's not and i'm breaking my head .

Table 1:

i have the data  Availability in month in percentage

this data is an monthly extract so this aren't unique values,

Table 2:

I have percentage  during planned Maintenance,

here on this table its possible that we have multiple data per month (multiple planned maintenances)

i would like to create a measure

=Table1[Availability %]+Table2[Percentage planned Maintenance]

this however is not possible as i have no unique values in both tables i believe, so i will have to write a bigger DAX formule, but here is where i get lost.

Accepted Solutions
Highlighted
Regular Visitor
Posts: 20
Registered: ‎07-17-2017

## Re: Sum of to many on different tables

I found my solution elsewhere

here is what it fixed

Create measure for individual %

tot %= sum(%per month)

tot planned %= sum(planned maintenance per month).

After that create final measure

[ tot %]  + [tot planned %]

All Replies
Super User
Posts: 685
Registered: ‎11-01-2017

## Re: Sum of to many on different tables

From your message, i understand that the relationship is not set up yet.

As you know, Power BI doesnt support Many to Many relationship, which means both common columns has duplicate values in both tables, you cant directly join them . You need to create a relationship table/ bridge table to make relationship.

Create a table with Unique values from your joining columns and join both of your tables to this new table and set the relationship.

Thanks

Raj

Regular Visitor
Posts: 20
Registered: ‎07-17-2017

## Re: Sum of to many on different tables

well there is a relationship already towards another table with Unique values

both tables refer to the same table and same field

Super User
Posts: 685
Registered: ‎11-01-2017

## Re: Sum of to many on different tables

"this however is not possible as i have no unique values in both tables i believe" -- i came to that conclusion based on this statement. Do you think you can post some sample data and details about your relationship.

Thanks

Raj

Highlighted
Regular Visitor
Posts: 20
Registered: ‎07-17-2017

## Re: Sum of to many on different tables

I found my solution elsewhere

here is what it fixed

Create measure for individual %

tot %= sum(%per month)

tot planned %= sum(planned maintenance per month).

After that create final measure

[ tot %]  + [tot planned %]