The most efficient approach is to use the 'Combine Files' method in Power Query, treating the Excel workbook as a folder and selecting all sheets. This technique is correct because Power Query’s folder connector treats each sheet as a separate file, automatically applying a sample transformation to all sheets and merging them into a single table with a single step, even if sheet names change. On the PL-300 exam, this tests your understanding of Power Query’s M language and its ability to handle dynamic data sources—a common trap is manually creating separate queries for each sheet, which is inefficient and breaks when new sheets are added. To combine multiple Excel sheets into one table in Power Query, remember the folder trick: think of the workbook as a container, not a flat file. Memory tip: “Folder first, sheets follow” — if you see multiple sheets with identical structures, always reach for the folder connector to avoid manual merging.
PL-300 Prepare the data Practice Question
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 preparing data from an Excel workbook that contains multiple sheets. Each sheet has a similar structure but different data. You need to combine all sheets into a single table in Power Query. What is the most efficient approach?
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' approach with the workbook as a folder, then select all sheets.
Option C is correct because the 'Combine Files' approach in Power Query treats the workbook as a folder, allowing you to select all sheets and automatically combine them into a single table. This is the most efficient method when multiple sheets have a similar structure, as it uses a single transformation step and handles dynamic sheet names without manual query creation.
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.
✗
Load each sheet as a separate query and then use 'Append Queries' to combine them.
Why it's wrong here
While possible, it requires manual effort and is not efficient for many sheets.
✗
Use 'Merge Queries' to join the sheets based on a common column.
Why it's wrong here
Merge is for joining columns, not appending rows.
✓
Use the 'Combine Files' approach with the workbook as a folder, then select all sheets.
Why this is correct
Power Query can treat a single workbook as a folder of sheets and combine them automatically.
Related concept
Read the scenario before looking for a memorised answer.
✗
Create a new query that references each sheet query and then merges them.
Why it's wrong here
Merging is for combining columns, not rows; appending is for rows.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse 'Append Queries' (which stacks rows) with 'Merge Queries' (which joins columns), and overlook the 'Combine Files' approach because they think it only applies to multiple files, not multiple sheets within a single workbook.
Detailed technical explanation
How to think about this question
Under the hood, the 'Combine Files' approach uses Power Query's 'Folder' connector to read the workbook as a binary file, then applies a 'Transform Sample File' step that automatically detects all sheets and applies the same transformation logic to each. This method leverages Power Query's M language to generate a parameterized function that iterates over each sheet, making it highly efficient for workbooks with many sheets or when new sheets are added later.
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' approach with the workbook as a folder, then select all sheets. — Option C is correct because the 'Combine Files' approach in Power Query treats the workbook as a folder, allowing you to select all sheets and automatically combine them into a single table. This is the most efficient method when multiple sheets have a similar structure, as it uses a single transformation step and handles dynamic sheet names without manual query creation.
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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