The correct answer is that the measure returns the total sales amount for the online channel only. This is because the CALCULATE function in Power BI modifies the filter context of the calculation; here, it evaluates the SUM of the Amount column specifically for rows where the Channel field equals "Online," effectively isolating online transactions from all other sales channels. On the Microsoft Azure Data Fundamentals DP-900 exam, this question tests your understanding of how CALCULATE alters context to perform dynamic aggregations, a common scenario when building measures for reports. A frequent trap is confusing CALCULATE with a simple SUM, which would total all sales regardless of channel, or mistaking it for a row count. To remember, think of CALCULATE as a "filtered calculator"—it only sums what you explicitly allow through its filter arguments.
DP-900 Describe an analytics workload on Azure Practice Question
This DP-900 practice question tests your understanding of describe an analytics workload on azure. 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.
Exhibit
Refer to the exhibit.
Power BI DAX expression:
```
Total Sales =
CALCULATE(
SUM(Sales[Amount]),
Sales[Channel] = "Online"
)
```
Refer to the exhibit. You have a Power BI measure defined as shown. What does this measure return?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The total sales amount for online channel only.
Option A is correct. The CALCULATE function evaluates the SUM of Amount for rows where Channel is "Online". Option B is wrong because it sums all sales. Option C is wrong because it sums Amount per product, not total. Option D is wrong because it counts rows.
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 count of online sales transactions.
Why it's wrong here
Uses SUM, not COUNT.
✗
The sum of Amount for each product sold online.
Why it's wrong here
This would be a measure at product level, but the measure is total.
✗
The total sales amount for all channels.
Why it's wrong here
The filter restricts to online channel.
✓
The total sales amount for online channel only.
Why this is correct
CALCULATE with filter on Channel='Online'.
Related concept
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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this DP-900 question in full detail.
Identify which DP-900 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.
Describe an analytics workload on Azure — This question tests Describe an analytics workload on Azure — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The total sales amount for online channel only. — Option A is correct. The CALCULATE function evaluates the SUM of Amount for rows where Channel is "Online". Option B is wrong because it sums all sales. Option C is wrong because it sums Amount per product, not total. Option D is wrong because it counts rows.
What should I do if I get this DP-900 question wrong?
Identify which DP-900 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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