Values from Unrelated table

[ryand009]

Hello

Part of my model is ..

I need to count the number of StudentID's in Table_B that have matching values in Table_C based on a Regdate range from Table_B. I've got the folowing Dax expression, that is returning a value, but not the correct one.

EVALUATE
ROW (
"j",
CALCULATE (
COUNTROWS(Table_B),
FILTER (
Table_B,
Table_B[RegDate] >= DATE (2025, 1, 1) &&
Table_B[RegDate] <= DATE (2025, 1, 31) &&
NOT (
ISBLANK (
LOOKUPVALUE (
Table_C[StudentID],
Table_C[StudentID],
Table_B[StudentID]
)
)
)
)
)
)

Thanks in advance

Roy

[vivek31 · Accepted solution]

HI @ryand009,

you can use a VALUES instead of LOOKUPVALUE function

EVALUATE
ROW(
    "j",
    CALCULATE(
        COUNTROWS(Table_B),
        FILTER(Table_B,
                Table_B[RegDate] >= DATE (2025, 1, 1) &&
                Table_B[RegDate] <= DATE (2025, 1, 31)),
                Table_B[StudentID] IN VALUES ( Table_C[StudentID])))

[quantumudit]

Hi @ryand009 

Could you please provide sample data that fully represents your issue or question in a usable format, rather than a screenshot? Ensure the dataset is anonymized and does not contain any sensitive or unrelated information.

Additionally, it would be very helpful if you could share the expected outcome based on the provided data - this can be in any format, including a screenshot. Having a clear reference for comparison will significantly improve the chances of getting the correct solution in the first response.

For best practices, you may find the following links useful:

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Thanks,

Udit

[Greg_Deckler]

@ryand009 Sorry, having trouble following, can you post sample data as text and expected output?
Not really enough information to go on, please first check if your issue is a common issue listed here: https://community.powerbi.com/t5/Community-Blog/Before-You-Post-Read-This/ba-p/1116882

Also, please see this post regarding How to Get Your Question Answered Quickly: https://community.powerbi.com/t5/Community-Blog/How-to-Get-Your-Question-Answered-Quickly/ba-p/38490

The most important parts are:
1. Sample data as text, use the table tool in the editing bar
2. Expected output from sample data
3. Explanation in words of how to get from 1. to 2.