Code Issues Solver | DAX

DAX Disconnect Event Summary Fix

This analysis addresses errors in a DAX formula for counting unique disconnect events in a dataset. A revised formula is provided, incorporating proper usage of FILTER, SUMMARIZE, and COUNTROWS functions to ensure accurate reporting.

Prompt

Disco Yes/No = 
VAR DiscoRows=
    Generate(
        SUMMARIZE(
        'NEW.DIM_Bills',
        'NEW.DIM_Bills'[UserName],
        'NEW.DIM_Bills'[DisconnectDate],
        'NEW.DIM_Bills'[BillId],
        ),
        ROW("UserName",'NEW.DIM_Bills'[UserName], "Disconnect Date", 'NEW.DIM_Bills'[DisconnectDate]
    )
RETURN
Countrows(DiscoRows)
FILTER('NEW.DIM_Bills',VALUE('NEW.DIM_Bills'[DisconnectDate] = "Blank")

Answer

Problem Analysis

The provided DAX formula aims to summarize disconnect events from the 'NEW.DIM_Bills' table by obtaining a count of unique rows based on user names, disconnect dates, and bill IDs. However, there are multiple syntax and logical issues that must be addressed.

Key Issues Identified

Incorrect Use of Generate Function: The Generate function is not necessary in this context since you are trying to create a summarized table.
Incorrect Syntax for ROW Construction: The ROW function requires proper closure with parentheses, and should not be used within SUMMARIZE as written.
FILTER Function Misplacement: The FILTER function should be applied correctly to restrict rows based on the condition provided.
Value Check: The condition VALUE('NEW.DIM_Bills'[DisconnectDate] = "Blank") is improperly formulated.

Proposed Solution

Below is a revised DAX formula that accurately counts the unique user disconnects while handling blanks properly.

Revised DAX Code

DISCO Yes/No = 
VAR DiscoRows =
    SUMMARIZE(
        FILTER(
            'NEW.DIM_Bills',
            NOT(ISBLANK('NEW.DIM_Bills'[DisconnectDate]))
        ),
        'NEW.DIM_Bills'[UserName],
        'NEW.DIM_Bills'[DisconnectDate],
        'NEW.DIM_Bills'[BillId]
    )
RETURN
    COUNTROWS(DiscoRows)

Explanation of Each Component

FILTER Function: This function is used to filter out rows where the 'DisconnectDate' is not blank. The usage of NOT(ISBLANK()) ensures that only relevant records are counted.
SUMMARIZE Function: It then summarizes the filtered results by the required columns (UserName, DisconnectDate, and BillId).
COUNTROWS Function: Finally, COUNTROWS is used to return the number of unique disconnect events from the summarized table.

Usage Example

To utilize this measure in a report:

Create a New Measure: Insert this code into the measure editor in your Power BI report.
Visual Representation: Use the new measure DISCO Yes/No in your visualizations to display the total count of disconnects across various user segments and time frames.

Conclusion

The provided DAX formula has been corrected to ensure proper functionality and to conform to logical expectations for summarizing data regarding user disconnects. This solution should now fulfill the requirement accurately while following best DAX practices.

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