This PL-300 practice question tests your understanding of prepare the data. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 loading data from a folder containing multiple Excel files with identical structure. Some files have inconsistent column names due to manual edits. You need to ensure that all data is loaded correctly without errors. What should you do in Power Query?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use the 'Combine Files' feature with a sample file, then in the transformation step, promote headers and rename columns using a mapping table.
Option A is correct because the 'Combine Files' feature in Power Query uses a sample file to infer the schema, and then you can apply transformations like promoting headers and renaming columns using a mapping table to handle inconsistent column names across files. This ensures all data loads without errors by standardizing the column names before combining.
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.
✓
Use the 'Combine Files' feature with a sample file, then in the transformation step, promote headers and rename columns using a mapping table.
Why this is correct
This approach handles variations by standardizing column names.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use 'Merge Queries' to join the files based on row position.
Why it's wrong here
Merge queries does not handle different column names.
✗
Change the data source to a SharePoint folder and use 'Load to Data Model' directly.
Why it's wrong here
SharePoint folder does not resolve column name inconsistencies.
✗
In Power Query, use 'Enter Data' to manually create the schema.
Why it's wrong here
Manual entry is not scalable for multiple files.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates assume 'Combine Files' works automatically without any transformation steps, overlooking the need to handle inconsistent column names, which leads to errors during data load.
Detailed technical explanation
How to think about this question
Under the hood, the 'Combine Files' feature uses a sample file to generate a transformation script that applies to all files, but if column names vary, the default behavior may fail. By adding a step to rename columns using a mapping table (e.g., via 'Replace Values' or a custom function), you can normalize headers before appending, ensuring that Power Query's M engine can union the tables without schema mismatch errors. This approach is critical in real-world scenarios where source files are manually edited by different users, leading to inconsistent naming conventions.
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: Use the 'Combine Files' feature with a sample file, then in the transformation step, promote headers and rename columns using a mapping table. — Option A is correct because the 'Combine Files' feature in Power Query uses a sample file to infer the schema, and then you can apply transformations like promoting headers and renaming columns using a mapping table to handle inconsistent column names across files. This ensures all data loads without errors by standardizing the column names before combining.
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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