The correct answer is CALCULATE(SUM(Sales[Amount]), DATEADD(Calendar[Date], -1, MONTH)). This DAX expression works because DATEADD shifts the date context backward by one month, and wrapping it inside CALCULATE transforms the filter context to evaluate sales for that prior period. On the Microsoft Power BI Data Analyst PL-300 exam, this question tests your understanding of time intelligence functions and how they interact with an active relationship between a fact table and a separate date table. A common trap is confusing DATEADD with PREVIOUSMONTH—while both can return last month, DATEADD is more flexible for non-continuous date ranges and is the safer choice in most models. Another trap is selecting the option that shifts by one year instead of one month. For a quick memory tip, think of DATEADD as a time machine: negative values go backward, positive go forward, and the unit parameter (MONTH, QUARTER, YEAR) controls the jump size.
PL-300 Model the data Practice Question
This PL-300 practice question tests your understanding of model 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 model with a table 'Sales' and a separate 'Calendar' table. The relationship between Sales[OrderDate] and Calendar[Date] is active. You need to create a measure that calculates the total sales for the previous month relative to the current filter context. Which DAX expression should you use?
Option C is correct. CALCULATE with DATEADD shifting by -1 month returns the same period last month. Option A uses PREVIOUSMONTH which is equivalent but requires a continuous date range; DATEADD is more flexible. Option B returns dates in the next month. Option D returns dates in the same month of previous year.
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.
Read the scenario before looking for a memorised answer.
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.
Model the data — This question tests Model the data — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: CALCULATE(SUM(Sales[Amount]), DATEADD(Calendar[Date], -1, MONTH)) — Option C is correct. CALCULATE with DATEADD shifting by -1 month returns the same period last month. Option A uses PREVIOUSMONTH which is equivalent but requires a continuous date range; DATEADD is more flexible. Option B returns dates in the next month. Option D returns dates in the same month of previous year.
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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