The answer is to apply a filter to the column and select Errors, or use Remove Errors and then review the removed rows. These two actions are correct because Power Query’s error filtering mechanism directly isolates rows containing a DataFormat.Error, allowing you to inspect the invalid cell values without altering the rest of your dataset. The Remove Errors function creates a table of the problematic rows, which you can review to understand the data type mismatch or malformed entry causing the refresh failure. On the Microsoft Power BI Data Analyst PL-300 exam, this scenario tests your ability to troubleshoot data transformation errors, often appearing as a multiple-select question where a common trap is to choose “Replace Errors” instead of isolating the rows first. Remember the memory tip: “Filter to find, Remove to review” — always isolate errors before deciding how to handle them.
PL-300 Prepare the data Practice Question
This PL-300 practice question tests your understanding of prepare the data. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
You are troubleshooting a Power Query that fails to refresh. The error message indicates a 'DataFormat.Error: Invalid cell value' for a column. Which TWO actions can help identify the problematic rows?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Apply a filter to the column to exclude errors and see which rows remain.
Option A is correct because applying a filter to the column and selecting 'Errors' (or deselecting errors) lets you isolate rows that contain invalid cell values. This directly shows which rows are causing the DataFormat.Error, allowing you to inspect or correct them. It is a quick, non-destructive way to identify problematic data without removing or altering other rows.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
Apply a filter to the column to exclude errors and see which rows remain.
Why this is correct
Filtering out errors helps isolate the problematic rows.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use 'Group By' to aggregate the column.
Why it's wrong here
Grouping may still fail due to errors.
✓
Use 'Remove Errors' to remove problematic rows and then review the removed rows.
Why this is correct
This shows which rows have errors.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use 'Replace Errors' with a default value.
Why it's wrong here
This replaces errors but doesn't identify which rows caused them.
✗
Change the column type to text to avoid the error.
Why it's wrong here
This masks the problem but doesn't help identify the rows.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often choose 'Replace Errors' or 'Change Type to Text' thinking they fix the error, but these actions mask the problem without identifying the root cause, which is what the question specifically asks for.
Detailed technical explanation
How to think about this question
Under the hood, Power Query evaluates each cell during the type conversion or transformation step; a 'DataFormat.Error' occurs when a value cannot be coerced into the expected data type (e.g., 'abc' in a number column). Using 'Remove Errors' (Option C) generates a table of removed rows in the Query Settings pane, which you can review to see exactly which rows failed. This is more efficient than filtering when you need to audit or log all error rows for downstream correction.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Prepare the data — This question tests Prepare the data — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Apply a filter to the column to exclude errors and see which rows remain. — Option A is correct because applying a filter to the column and selecting 'Errors' (or deselecting errors) lets you isolate rows that contain invalid cell values. This directly shows which rows are causing the DataFormat.Error, allowing you to inspect or correct them. It is a quick, non-destructive way to identify problematic data without removing or altering other rows.
What should I do if I get this PL-300 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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