The answer is Option B, using CALCULATE with DATESINPERIOD and a filter on products with sales in the current month. This is correct because DATESINPERIOD dynamically shifts the date window back 12 months from the current filter context, enabling a true rolling total, while the additional filter restricts the calculation to only those products that have at least one sale in the current month. On the Microsoft Power BI Data Analyst PL-300 exam, this question tests your ability to combine time intelligence with dynamic row-level filters—a common scenario for line charts showing monthly revenue trends. A frequent trap is confusing TOTALQTD for quarter-to-date with a rolling 12-month requirement, or thinking a static calculated column can handle month-over-month changes. Remember the memory tip: “Rolling window needs DATESINPERIOD; current-month products need a filter inside CALCULATE.”
PL-300 Visualize and analyze the data Practice Question
This PL-300 practice question tests your understanding of visualize and analyze 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 includes a table 'Orders' with columns: OrderDate, CustomerID, ProductID, Quantity, and Revenue. You need to create a measure that calculates the running total of Revenue over the last 12 months, but only for products that have been sold in the current month. The measure should be used in a line chart showing monthly revenue. You have the following options: A. Use the TOTALQTD function with a filter for last 12 months. B. Use CALCULATE with DATESINPERIOD and a filter on products with sales in the current month. C. Create a calculated column for running total and then sum it. D. Use the WINDOW function (Preview). Which option should you choose?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use CALCULATE with DATESINPERIOD and a filter on products with sales in the current month
Option B is correct because you can use CALCULATE with DATESINPERIOD to compute the running total over 12 months, and add a filter to restrict to products that have sales in the current month. Option A is wrong because TOTALQTD is for quarter-to-date, not rolling 12 months. Option C is wrong because calculated columns are static and not dynamic for each month. Option D is wrong because WINDOW function is still in preview and not recommended for production.
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 WINDOW function (Preview)
Why it's wrong here
WINDOW is preview and may not be stable.
✓
Use CALCULATE with DATESINPERIOD and a filter on products with sales in the current month
Why this is correct
This dynamically computes the rolling 12-month total for relevant products.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use TOTALQTD with a filter for last 12 months
Why it's wrong here
TOTALQTD calculates quarter-to-date, not rolling 12 months.
✗
Create a calculated column for running total and then sum it
Why it's wrong here
Calculated columns do not recalculate based on filter context.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→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
An e-commerce site experiences heavy traffic on Black Friday and near-zero traffic during off-peak weeks. Rather than provisioning permanent large VMs, the team uses auto-scaling groups that add capacity automatically under load and reduce it overnight. Questions like this test whether you understand elasticity, availability zones, and cloud compute scaling patterns.
What to study next
Got this wrong? Here's your next step.
Identify which PL-300 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Visualize and analyze the data — This question tests Visualize and analyze the data — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Use CALCULATE with DATESINPERIOD and a filter on products with sales in the current month — Option B is correct because you can use CALCULATE with DATESINPERIOD to compute the running total over 12 months, and add a filter to restrict to products that have sales in the current month. Option A is wrong because TOTALQTD is for quarter-to-date, not rolling 12 months. Option C is wrong because calculated columns are static and not dynamic for each month. Option D is wrong because WINDOW function is still in preview and not recommended for production.
What should I do if I get this PL-300 question wrong?
Identify which PL-300 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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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