Implicit type conversion cannot fix case-sensitivity errors in DirectQuery

Profile and clean the data
Answer Correct answer: B — No, implicit type conversion changes storage type but not casing, so the undefined values persist.

Note: This question is part of a series of questions that present the same scenario. Each question in the series contains a unique solution that might meet the stated goals. Some question sets might have more than one correct solution, while others might not have a correct solution. After you answer a question in this section, you will NOT be able to return to it. As a result, these questions will not appear in the review screen. You have a data source that contains a column. The column contains case sensitive data. You have a Power BI semantic model in DirectQuery mode. You connect to the model and discover that it contains undefined values and errors. You need to resolve the issue. Solution: You implicitly convert the values into the required type. Does this meet the goal?

  1. Yes
  2. No Correct Answer
implicit conversion dax case sensitivity directquery undefined values

Community Votes

B
100%

100% of anonymous learners picked answer B. Votes are pick records left by other test-takers — they are not the verified answer.

Community Insight

The undefined values stem from the case-insensitive Power BI engine colliding rows from a case-sensitive source — a type conversion changes storage representation, not string casing, so the collisions remain.

Continuing the case-sensitive DirectQuery scenario, the proposed solution implicitly converts the values into the required type to resolve undefined values and errors.

Believing a data type change will clean errors — the errors and undefined values exist because of casing collisions, and converting type on already-failed values cannot restore the original distinctions the engine flattened.

Community Discussion (6 comments)

Alexander14 👍 2 Selected: B
Implicitly converting values into the required type does not address the issue of case sensitivity in the column. The problem arises because Power BI, depending on the data source and model configuration, may not handle case-sensitive data as expected. Undefined values and errors may occur when case sensitivity isn't correctly managed.
7Veritas 👍 2 Selected: B
No, this solution does not meet the goal. Implicitly converting values into a required type would not resolve issues related to case sensitivity in DirectQuery mode. This solution might actually cause more problems or errors because: - Case sensitivity issues are related to text comparison and matching, not data type conversion - In DirectQuery mode, operations are pushed to the source database, and implicit conversions might not handle case sensitivity correctly - Implicit conversions could potentially create more undefined values or errors if the conversion fails
Kemmy2002____ 👍 1 Selected: B
you have to correct the errors first then change the data type
LuluSkyy 👍 2
B is correct, you mist first replace the errors before changing the data type.
Jayaruwan 👍 2 Selected: B
You have to correct errors before setting the data type
Tex02 👍 3
I believe the answer is correct as case sensitive data would need to be checked in the source system or explicitly handled in a query with an UPPER() or similiar function

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Expert Analysis

Why the Answer Is Correct

The documented cause of this scenario's undefined values and errors is the mismatch between the case-sensitive source column and the case-insensitive Power BI engine in DirectQuery mode. Implicitly converting values to another type does not change the casing of any string, so the engine still sees colliding values and still produces undefined results. The solution therefore does not meet the goal.

Why the Other Options Are Wrong

Answering Yes would require implicit conversion to alter case behavior, which no type conversion does — text remains text with identical casing regardless of storage type. The official remedies for this scenario remain casing normalization or adding an index key; type conversion appears in neither, and commenters add that conversions attempted on error values typically fail or propagate the errors further.

Community Comment Notes

The vote is unanimous for No, with commenters noting that implicit conversion does not address case sensitivity and that errors must be corrected at the data level first. The consistent reasoning matches the documented cause of the problem.

Official Reference

https://learn.microsoft.com/en-us/power-bi/connect-data/desktop-data-types

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