The correct approach is to apply a filter on the Region column directly in Power Query after loading the view. This is the standard method when the SQL Server view does not accept parameters, as it leverages query folding—Power Query translates the filter step into a SQL WHERE clause that is pushed down to the server, minimizing data transfer and improving refresh performance. On the PL-300 exam, this scenario tests your understanding of query folding versus loading all data first; a common trap is assuming you must use SQL Server-side filtering or a custom SQL statement, but Power Query’s native filter step achieves the same efficiency without modifying the source. Remember the memory tip: “Fold it, don’t force it”—let Power Query push filters down rather than pulling everything into memory.
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 have a Power BI dataset that uses a SQL Server view as the data source. The view returns data for all customers, but you only need data for customers in the 'West' region. The view does not accept parameters. How should you filter the data?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
In Power Query, apply a filter on the Region column after loading the view.
Option B is correct because applying a filter in Power Query after loading the view is the standard approach when the source view does not accept parameters. This method leverages Power Query's query folding capabilities, which push the filter down to the SQL Server, reducing data transfer and improving performance. It avoids loading unnecessary data into the model while maintaining the ability to refresh efficiently.
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 a native SQL query in Power Query with a WHERE clause to ensure query folding.
Why it's wrong here
Using a native SQL query is an option, but not the only one; and query folding may not occur with views.
✓
In Power Query, apply a filter on the Region column after loading the view.
Why this is correct
This filters the data after import.
Related concept
Read the scenario before looking for a memorised answer.
✗
Ask the database administrator to modify the view to include a WHERE clause.
Why it's wrong here
This is outside your control and not a Power BI solution.
✗
Load the entire view into the model and use a report-level filter.
Why it's wrong here
This loads unnecessary data, impacting performance.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often assume a native SQL query is always more efficient, but Power Query's query folding can achieve the same result without breaking the connection to the view, and modifying the source view is not always an option.
Detailed technical explanation
How to think about this question
Query folding in Power Query translates high-level transformations (like filtering) into SQL WHERE clauses that are executed on the SQL Server, minimizing data movement. When a view does not accept parameters, Power Query can still fold filters on columns that exist in the view, as long as the transformation is supported by the source. In real-world scenarios, this approach is critical for large datasets where importing all rows would cause memory pressure and slow refresh times.
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: In Power Query, apply a filter on the Region column after loading the view. — Option B is correct because applying a filter in Power Query after loading the view is the standard approach when the source view does not accept parameters. This method leverages Power Query's query folding capabilities, which push the filter down to the SQL Server, reducing data transfer and improving performance. It avoids loading unnecessary data into the model while maintaining the ability to refresh efficiently.
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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