PL-300 Visualize and analyze the data Practice Question
This PL-300 practice question tests your understanding of visualize and analyze the data. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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.
Exhibit
Refer to the exhibit.
DAX expression:
```
Sales YoY % =
VAR CurrentSales = SUM(Sales[Amount])
VAR PreviousSales = CALCULATE(SUM(Sales[Amount]), SAMEPERIODLASTYEAR('Date'[Date]))
RETURN
DIVIDE(CurrentSales - PreviousSales, PreviousSales)
```
You have the above DAX measure. When you add it to a table visual with Year and Month, the values are correct for each month. However, when you add a slicer for Year and select 2023, the measure shows blank for all months. What is the most likely cause?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The Date table is not marked as a date table.
The SAMEPERIODLASTYEAR function requires a continuous date range. If the Date table does not have a relationship to Sales or if the date table is missing dates (e.g., only dates where sales occurred), the function may return blank. However, a common issue is that the Date table must be marked as a date table. Another cause could be that the date table does not contain dates for the previous year. But given the symptom 'shows blank for all months when slicer is applied', it suggests the date table is not continuous or not marked as date table. In Power BI, if a date table is not marked as a date table, time intelligence functions may not work correctly with slicers.
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.
✗
The measure uses DIVIDE instead of a simple division.
Why it's wrong here
DIVIDE handles division by zero; it wouldn't cause blanks.
✓
The Date table is not marked as a date table.
Why this is correct
Time intelligence functions require a date table to be marked as such.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
The Sales table has a many-to-many relationship with Date.
Why it's wrong here
Many-to-many relationships would cause other issues, not blank results with slicer.
✗
The slicer is filtering the Sales table directly.
Why it's wrong here
If slicer filters Sales, the measure would still calculate for those months.
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
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 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: The Date table is not marked as a date table. — The SAMEPERIODLASTYEAR function requires a continuous date range. If the Date table does not have a relationship to Sales or if the date table is missing dates (e.g., only dates where sales occurred), the function may return blank. However, a common issue is that the Date table must be marked as a date table. Another cause could be that the date table does not contain dates for the previous year. But given the symptom 'shows blank for all months when slicer is applied', it suggests the date table is not continuous or not marked as date table. In Power BI, if a date table is not marked as a date table, time intelligence functions may not work correctly with slicers.
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.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
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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