Microsoft PL-300 Practice Test 13
Question 120
The original scenario was: One supplier CSV occasionally introduces a text note into a Whole Number identifier column. The initial solution is already in place. Now this new requirement arises: The supplier switches to alphanumeric identifiers permanently. Which ADDITIONAL action BEST meets the changed condition?
- Conversion failures are isolated and refreshed valid rows remain traceable
- Use Text identifiers with an appropriate stable business-key scheme
- Use error detection and schema-aware conversion for the affected identifier
- Turn off all model refresh without examining the changed input
Explanation
Correct Answer
B:The changed requirement is 'The supplier switches to alphanumeric identifiers permanently'. The additional response is 'Use Text identifiers with an appropriate stable business-key scheme'.
Incorrect Answers
A:This observes the original approach but is not an additional action: Conversion failures are isolated and refreshed valid rows remain traceable.
C:This is the already implemented original solution: Use error detection and schema-aware conversion for the affected identifier. Strict type conversion can create cell errors when source values drift. It does not itself solve the new requirement.
D:This remains unsuitable for the original situation: Suppressing refresh does not explain or correct the schema exception. It also does not meet the changed need.
Question 121
A delivery feed has unusual extreme travel durations, and managers want to know if those are anomalies. Which approach BEST meets the stated Microsoft Power BI requirement?
- Add a validation column that flags records outside the approved rule
- Use the first value as the maximum allowed duration for every record
- Use Change Type with Locale for the correct regional date format
- Inspect column statistics, distributions, and source-level records before filtering
Explanation
Correct Answer
D:Profiling helps distinguish outliers from systematic data-entry problems. For the stated case, Inspect column statistics, distributions, and source-level records before filtering.
Incorrect Answers
A:This might be appropriate after a different requirement arises: Management adopts a documented threshold for impossible durations. It is not the best initial response to the stated case.
B:One arbitrary example is not a valid outlier threshold. The proposed shortcut 'Use the first value as the maximum allowed duration for every record' fails the documented need.
C:This addresses a separate source situation: A European file encodes 31/12/2025 but the model interprets it as a US month/day date. It does not directly satisfy this case's priority. In the current question, this comparison is made against: A delivery feed has unusual extreme travel durations, and managers want to know if those are anomalies. Which approach BEST meets the stated Microsoft Power BI requirement?
Question 122
A delivery feed has unusual extreme travel durations, and managers want to know if those are anomalies. A colleague proposes: Use the first value as the maximum allowed duration for every record. Which explanation BEST identifies the defect in that proposal?
- Integer type cannot preserve the intended calendar dates
- The suggested approach is safe merely because its product name is familiar.
- Profiling helps distinguish outliers from systematic data-entry problems
- One arbitrary example is not a valid outlier threshold
Explanation
Correct Answer
D:One arbitrary example is not a valid outlier threshold. This directly explains why the proposal 'Use the first value as the maximum allowed duration for every record' should not be used.
Incorrect Answers
A:This addresses a different case: A European file encodes 31/12/2025 but the model interprets it as a US month/day date. It is not the specific defect in 'Use the first value as the maximum allowed duration for every record'.
B:Product familiarity is not evidence of suitability. The actual defect in this proposal is: One arbitrary example is not a valid outlier threshold.
C:This is reasoning supporting the preferred solution 'Inspect column statistics, distributions, and source-level records before filtering', but it does not directly name the defect in the proposed shortcut.
Question 123
A delivery feed has unusual extreme travel durations, and managers want to know if those are anomalies. After implementing Inspect column statistics, distributions, and source-level records before filtering, which observation BEST demonstrates that the intended result is actually working?
- Flagged extreme cases are reviewed and true operational exceptions retained
- The report owner approves Inspect column statistics, distributions, and source-level records before filtering without testing the resulting behavior.
- The transformed field recognizes 31 December 2025 correctly
- The team schedules a future check of whether Flagged extreme cases are reviewed and true operational exceptions retained, but has not observed a result.
Explanation
Correct Answer
A:The observation 'Flagged extreme cases are reviewed and true operational exceptions retained' directly tests the intended result. Profiling helps distinguish outliers from systematic data-entry problems.
Incorrect Answers
B:Approval of a proposed design is not evidence of working behavior. The required observation is: Flagged extreme cases are reviewed and true operational exceptions retained.
C:This belongs to a different case: A European file encodes 31/12/2025 but the model interprets it as a US month/day date. It does not validate the current change. In the current question, this comparison is made against: A delivery feed has unusual extreme travel durations, and managers want to know if those are anomalies. After implementing Inspect column statistics, distributions, and source-level records before filtering, which observation BEST demonstrates that the intended result is actually working?
D:A future test is not yet observed operational evidence. The verification must establish: Flagged extreme cases are reviewed and true operational exceptions retained.
Question 124
The original scenario was: A delivery feed has unusual extreme travel durations, and managers want to know if those are anomalies. The initial solution is already in place. Now this new requirement arises: Management adopts a documented threshold for impossible durations. Which ADDITIONAL action BEST meets the changed condition?
- Flagged extreme cases are reviewed and true operational exceptions retained
- Use the first value as the maximum allowed duration for every record
- Inspect column statistics, distributions, and source-level records before filtering
- Add a validation column that flags records outside the approved rule
Explanation
Correct Answer
D:The changed requirement is 'Management adopts a documented threshold for impossible durations'. The additional response is 'Add a validation column that flags records outside the approved rule'.
Incorrect Answers
A:This observes the original approach but is not an additional action: Flagged extreme cases are reviewed and true operational exceptions retained.
B:This remains unsuitable for the original situation: One arbitrary example is not a valid outlier threshold. It also does not meet the changed need.
C:This is the already implemented original solution: Inspect column statistics, distributions, and source-level records before filtering. Profiling helps distinguish outliers from systematic data-entry problems. It does not itself solve the new requirement.
Question 125
A data analyst notices that a successful preview becomes an error on service refresh when a source column disappears. Which TWO entries together identify the most appropriate initial action and direct observed evidence of its success? (Select TWO.)
- Review applied steps for references to missing columns and make handling resilient
- Hide the failed column in report view and assume the upstream query will succeed
- Validate required columns against the contract at ingestion
- Switch profiling to the entire data set when assessing all-row distributions
- Service refresh succeeds with the revised step and any missing fields handled explicitly
Explanation
Correct Answers
A:A renamed or missing column can break later Power Query transformation steps. For the stated case, Review applied steps for references to missing columns and make handling resilient.
E:Correct direct operational evidence. Service refresh succeeds with the revised step and any missing fields handled explicitly. This is a check of the original requirement, not an unperformed plan.
Incorrect Answers
B:Hiding a model field does not repair broken M references. The proposed shortcut 'Hide the failed column in report view and assume the upstream query will succeed' fails the documented need.
C:This might be appropriate after a different requirement arises: Source owners publish a formal versioned schema contract. It is not the best initial response to the stated case.
D:This addresses a separate source situation: A source includes 150000 transactions but Power Query's profile uses only the top 1000 rows. It does not directly satisfy this case's priority.
Question 126
A data analyst notices that a successful preview becomes an error on service refresh when a source column disappears. A colleague proposes: Hide the failed column in report view and assume the upstream query will succeed. Which explanation BEST identifies the defect in that proposal?
- A renamed or missing column can break later Power Query transformation steps
- A sample cannot establish whole-table quality
- Hiding a model field does not repair broken M references
- The suggested approach is safe merely because its product name is familiar.
Explanation
Correct Answer
C:Hiding a model field does not repair broken M references. This directly explains why the proposal 'Hide the failed column in report view and assume the upstream query will succeed' should not be used.
Incorrect Answers
A:This is reasoning supporting the preferred solution 'Review applied steps for references to missing columns and make handling resilient', but it does not directly name the defect in the proposed shortcut.
B:This addresses a different case: A source includes 150000 transactions but Power Query's profile uses only the top 1000 rows. It is not the specific defect in 'Hide the failed column in report view and assume the upstream query will succeed'.
D:Product familiarity is not evidence of suitability. The actual defect in this proposal is: Hiding a model field does not repair broken M references.
Question 127
A data analyst notices that a successful preview becomes an error on service refresh when a source column disappears. After implementing Review applied steps for references to missing columns and make handling resilient, which observation BEST demonstrates that the intended result is actually working?
- The report owner approves Review applied steps for references to missing columns and make handling resilient without testing the resulting behavior.
- The team schedules a future check of whether Service refresh succeeds with the revised step and any missing fields handled explicitly, but has not observed a result.
- Service refresh succeeds with the revised step and any missing fields handled explicitly
- Column distribution and error counts are computed over the full available source
Explanation
Correct Answer
C:The observation 'Service refresh succeeds with the revised step and any missing fields handled explicitly' directly tests the intended result. A renamed or missing column can break later Power Query transformation steps.
Incorrect Answers
A:Approval of a proposed design is not evidence of working behavior. The required observation is: Service refresh succeeds with the revised step and any missing fields handled explicitly.
B:A future test is not yet observed operational evidence. The verification must establish: Service refresh succeeds with the revised step and any missing fields handled explicitly.
D:This belongs to a different case: A source includes 150000 transactions but Power Query's profile uses only the top 1000 rows. It does not validate the current change.
Question 128
The original scenario was: A data analyst notices that a successful preview becomes an error on service refresh when a source column disappears. The initial solution is already in place. Now this new requirement arises: Source owners publish a formal versioned schema contract. Which ADDITIONAL action BEST meets the changed condition?
- Review applied steps for references to missing columns and make handling resilient
- Service refresh succeeds with the revised step and any missing fields handled explicitly
- Hide the failed column in report view and assume the upstream query will succeed
- Validate required columns against the contract at ingestion
Explanation
Correct Answer
D:The changed requirement is 'Source owners publish a formal versioned schema contract'. The additional response is 'Validate required columns against the contract at ingestion'.
Incorrect Answers
A:This is the already implemented original solution: Review applied steps for references to missing columns and make handling resilient. A renamed or missing column can break later Power Query transformation steps. It does not itself solve the new requirement.
B:This observes the original approach but is not an additional action: Service refresh succeeds with the revised step and any missing fields handled explicitly.
C:This remains unsuitable for the original situation: Hiding a model field does not repair broken M references. It also does not meet the changed need.
Question 129
A spreadsheet contains January, February, and March as separate columns, and users need a Month field for plotting. Which approach BEST meets the stated Microsoft Power BI requirement?
- Remove the non-data top row and promote the correct first data row to headers
- Unpivot the monthly columns to Month and Value rows
- Pivot the summarized Month rows into separate month columns in a presentation query
- Use Pivot to spread monthly rows into even more columns
Explanation
Correct Answer
B:Unpivot converts repeated categorical headers into a tidy attribute-value pair. For the stated case, Unpivot the monthly columns to Month and Value rows.
Incorrect Answers
A:This addresses a separate source situation: A Power Query dataset needs Column A as headers and has one junk metadata row at the top. It does not directly satisfy this case's priority.
C:This might be appropriate after a different requirement arises: The finance team later needs a wide cross-tab for export. It is not the best initial response to the stated case.
D:Pivot would create the opposite shape from the requested tidy fact table. The proposed shortcut 'Use Pivot to spread monthly rows into even more columns' fails the documented need.
Question 130
A spreadsheet contains January, February, and March as separate columns, and users need a Month field for plotting. A colleague proposes: Use Pivot to spread monthly rows into even more columns. Which explanation BEST identifies the defect in that proposal?
- The suggested approach is safe merely because its product name is familiar.
- Pivot would create the opposite shape from the requested tidy fact table
- Transposition is not a substitute for removing metadata rows
- Unpivot converts repeated categorical headers into a tidy attribute-value pair
Explanation
Correct Answer
B:Pivot would create the opposite shape from the requested tidy fact table. This directly explains why the proposal 'Use Pivot to spread monthly rows into even more columns' should not be used.
Incorrect Answers
A:Product familiarity is not evidence of suitability. The actual defect in this proposal is: Pivot would create the opposite shape from the requested tidy fact table.
C:This addresses a different case: A Power Query dataset needs Column A as headers and has one junk metadata row at the top. It is not the specific defect in 'Use Pivot to spread monthly rows into even more columns'.
D:This is reasoning supporting the preferred solution 'Unpivot the monthly columns to Month and Value rows', but it does not directly name the defect in the proposed shortcut.