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Helper I

## HELP! DAX Calculation: Many to many relationship

Hi! I am new to DAX, and am struggling to have a creative way for looking up the most recent service date when customer paid thier payments.

The requirements are as below:

There are 2 tables, Service and Payment (I do not set up any connectivity between them in data model now)

- Service

 Service Date Customr_ID 9/1/2022 101 9/5/2022 103 9/15/2022 101 9/20/2022 102 10/1/2022 103 10/15/2022 102

-Payment

 Payment_Date Customer_ID Amount(\$) Most_Recent_Service_Date 9/1/2022 101 20 9/1/2022 9/9/2022 103 100 9/5/2022 9/21/2022 101 150 9/15/2022 10/1/2022 103 35 10/1/2022 10/11/2022 102 10 9/20/2022 10/18/2022 102 10 10/15/2022

A customer can complete multiple services, and a customer can pay ON or AFTER their service.

Due to the fact that there is a gap between 2 tables, showing payment was paid for which service date. I am looking for writing a dax to calculate the most recent service date that is <= the pyament date per customer.

Column of "Most Recent Service Date" is my hopful output.

Thank you so much in advance! I am looking forward to any possible solutions!

1 ACCEPTED SOLUTION
Community Support

Hi  @jts_ ,

Pls test the below dax to create a new column:

``Column = CALCULATE(MAX(Service[Service Date]),FILTER(Service,Service[Service Date]<=Payment[Payment_Date]&&Service[Customr_ID]=Payment[Customer_ID]))``

Output result:

Best Regards

Lucien

2 REPLIES 2
Community Support

Hi  @jts_ ,

Pls test the below dax to create a new column:

``Column = CALCULATE(MAX(Service[Service Date]),FILTER(Service,Service[Service Date]<=Payment[Payment_Date]&&Service[Customr_ID]=Payment[Customer_ID]))``

Output result:

Best Regards

Lucien

Helper I

Hi @v-luwang-msft ,

I appreciate your solution, Lucien! Thanks a lot!!!

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