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berta2b's avatar
berta2b
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9 years ago
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Power BI Desktop Many to Many Relationships

Hi there guys, have an issue with typical many-to-many relationships in Power BI desktop. Here's my scenario: Bookings (30 columns)        BookingsLink                       BookingsEMails (20 ...
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  • berta2b's avatar
    berta2b
    9 years ago

    Hi Xiaoxin, sorry for not getting back to you earlier.

     

    Yes that is the case, the two outer tables have multiple records and not single entries so I agree Power BI won't support this.

     

    I've remodelled the data tables to insteadof trying to have multiple records in a many-to-many relationship that all the columns from these tables are added to one table which is a work around.

     

    Many Thanks Xiaoxin for all your help with this issue.

     

    Regards

    Bert.

berta2b's avatar
berta2b
Icon for Helper I rankHelper I
9 years ago

Hi Xiaoxin, thanks so much for your reply.

 

I have created this unique table, BookingsLink which has unique keys allowing the Many to one, One to Many between the two other tables.

 

My problem is although this relationship has been setup within Power BI Desktop 'Relationships' where I would think would resolve this, I can't access columns from the Table(Many) tables in one tabular visualisation report.

 

There are no blank keys, the Link table contains just the unique keys and no blanks.

 

Thanks again.

 

Bert

berta2b's avatar
berta2b
Icon for Helper I rankHelper I
9 years ago

Sorry I have to apologise, I have confused the issue somewhat, when I copied and pasted the tables structures the columns moved around a bit!

 

Here is the correct design.

 

Bookings (30 columns)        BookingsLink                       BookingsEMails (20 columns)
========                       ============            ==============
Booking Reference               Booking Reference              Booking Reference
BookingDate                                                                  EMail Sent
Brand                                 
Amount
Customer First Name
Customer Last Name
Etc . . .

 

 

  • berta2b's avatar
    berta2b
    Icon for Helper I rankHelper I
    9 years ago

    Hi Xiaoxin, here's the correct design again

     

    Bookings (30 columns)        BookingsLink                       BookingsEMails (20 columns)
    ========                       ============            ==============
    Booking Reference               Booking Reference              Booking Reference
    BookingDate                        (UNIQUE)                           EMail Sent
    Brand                                                                             EMail Address
    Amount
    Customer First Name
    Customer Last Name
    Etc . . .

     

    So the BookingsLink table has only one columns 'Booking Reference' which is unique and I'm trying to select 'Booking Date' and 'EMail Sent' for the same tabular report and then the issue.

     

    Thanks and sorry for the confusion again.

    Bert

    • berta2b's avatar
      berta2b
      Icon for Helper I rankHelper I
      9 years ago

      Hey Xiaoxin, just seen your post to check the bi-directional option.

       

      I'll give this a try and get back to you.

       

      Many Thanks.

      Bert

      • berta2b's avatar
        berta2b
        Icon for Helper I rankHelper I
        9 years ago

        Hi Xiaoxin, I tried your suggestion but this didn't work I'm afraid :(

         

        I set the 'Cross Filter direction' to BOTH on my 'Many to One' relation 'Bookings' -> 'BookingsLink' and 'BookingEMails' -> 'BookingsLink' and still had the same issue.

         

        Bert