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DAX to Return Column Value when there is no primary key but will only be based on Dates

Hi, I've been spending weeks trying to figure this out, hoping you could help me.

In my PBI, I have 2 tables - one is the class_tbl(dojo table) and the roster. I am trying to get the "wave" of a user if the date in roster is between the training start and end dates. And for the remaining dates in the roster will be the wave where the user attended the last training.


I used LASTNONBLANK but it only returned the first 2 waves.


There are multiple IDs that have this case, but this ID is one example. 


Here is my DAX:

wave_no_K =
        LASTNONBLANK(dojo_test_tbl[wave_number], 1),
        FILTER (
            ALL (dojo_test_tbl),
            dojo_test_tbl[eid] = EPMS_Roster[employee_id]
            && dojo_test_tbl[wave_type]="NES" && dojo_test_tbl[wave_final_end_date]<EPMS_Roster[date_extracted]


Here the Dojo or Class Table look likes




The 2/27/2023 date onwards should return wave 8C but it shows Cross-Skill 3A. The wave 8C is completely not captured.





Thank you so much!




Community Support
Community Support

Hi @emily_george_11 ,


What does your wave_type mean? Should I consider it when calculating?

Sorry for that the information you have provided is not making the problem clear to me. Can you please share more details to help us clarify your scenario?


Best Regards,

Jianbo Li

If this post helps, then please consider Accept it as the solution to help the other members find it more quickly.


Super User
Super User

Please provide sample data that covers your issue or question completely, in a usable format (not as a screenshot).
Please show the expected outcome based on the sample data you provided.

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