The correct answer is to use the 'Combine Files' transform with the first file as a sample. This is necessary because connecting to a SharePoint folder in Power Query treats all Excel files as a single data source, and the 'Combine Files' feature uses the first file to infer the schema—column names, data types, and structure—then automatically applies those transformations to every other file in the folder. On the PL-300 exam, this workflow tests your understanding of Power Query’s M-language engine and the folder connector, often appearing in scenario-based questions where you must combine Excel files from SharePoint without manual merging. A common trap is trying to import each file individually or using a manual append, which wastes time and breaks refreshability. Memory tip: think "Folder → Sample → Combine" as the three-step pipeline, where the sample file acts as the template for all others.
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.
A data analyst is preparing data from multiple Excel files stored in SharePoint. Each file has the same structure but different data. Which THREE steps are necessary to combine these files into a single table 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
✓
Create a connection to the SharePoint folder.
Option B is correct because connecting to the SharePoint folder allows Power Query to access all files in the folder as a single data source. This is the foundational step for the 'Combine Files' workflow, which then uses a sample file to infer the schema and automatically applies transformations to all matching files.
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 'Merge Queries' feature to join the files.
Why it's wrong here
Merge is for columns, not rows.
✓
Create a connection to the SharePoint folder.
Why this is correct
Necessary to access the files.
Related concept
Read the scenario before looking for a memorised answer.
✓
Filter the folder query to include only the relevant Excel files.
Why this is correct
Ensures only needed files are combined.
Related concept
Read the scenario before looking for a memorised answer.
✓
Use the 'Combine Files' transform with the first file as a sample.
Why this is correct
Automatically combines all files.
Related concept
Read the scenario before looking for a memorised answer.
✗
Individually import each file and append them manually.
Why it's wrong here
Manual process is not efficient.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse 'Merge Queries' (which joins tables horizontally) with 'Append Queries' (which stacks rows vertically), and they may overlook that the 'Combine Files' transform is the automated way to append multiple files from a folder, not manual import and append.
Detailed technical explanation
How to think about this question
The 'Combine Files' transform in Power Query works by reading the first file as a sample to detect the schema (columns, data types), then applying the same transformation to all other files in the folder. Under the hood, Power Query generates a parameterized function that is invoked for each file, using the SharePoint REST API or WebDAV protocol to stream file contents without downloading them entirely. In real-world scenarios, this approach handles hundreds of files efficiently, but note that if the sample file has missing columns that exist in other files, those columns will be dropped unless you explicitly modify the sample step.
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 company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
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: Create a connection to the SharePoint folder. — Option B is correct because connecting to the SharePoint folder allows Power Query to access all files in the folder as a single data source. This is the foundational step for the 'Combine Files' workflow, which then uses a sample file to infer the schema and automatically applies transformations to all matching files.
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.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
This PL-300 practice question is part of Courseiva's free Microsoft certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the PL-300 exam.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.