The correct answer is that the DAX measure does not appear in the Power BI field list because the expression uses SUMMARIZE, which returns a table rather than a single scalar value. For a measure to show up in the Fields pane, it must return a scalar result like a number, date, or string; table-returning functions like SUMMARIZE are not displayed as measures because Power BI treats them as calculated tables or intermediate expressions. On the Microsoft Power Platform Fundamentals PL-900 exam, this question tests your understanding of DAX measure fundamentals and the common trap of confusing table functions with scalar measures. A frequent mistake is assuming any valid DAX formula will appear in the field list, but only scalar outputs are visible there. Remember the memory tip: "Measures must be singular, not plural"—if your DAX returns multiple rows or columns, it won't show as a measure.
PL-900 Practice Question: Describe the business value of Microsoft Power Platform
This PL-900 practice question tests your understanding of describe the business value of microsoft power platform. 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.
Refer to the exhibit. A Power BI developer creates a DAX measure named 'SalesByRegion' as shown. The measure does not appear in the field list. What is the most likely issue?
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 expression creates a table, not a scalar measure.
Option A is correct because DAX measures must return a single scalar value (e.g., a number, date, or string) to appear in the Fields list of a Power BI report. The SUMMARIZE function returns a table with rows and columns, not a scalar, so Power BI treats it as a table expression and does not display it as a measure. Measures that return tables can only be used in other DAX expressions or as calculated tables, not directly in visuals.
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 expression creates a table, not a scalar measure.
Why this is correct
Measures must return a single scalar value; SUMMARIZE returns a table.
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 does not exist.
Why it's wrong here
Assuming it exists, the error is about the measure type.
✗
The SUMMARIZE function syntax is incorrect.
Why it's wrong here
The syntax is correct for creating a table.
✗
The measure name must be enclosed in single quotes.
Why it's wrong here
Measure names do not require quotes.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often assume any valid DAX expression will automatically appear as a measure, overlooking the critical distinction between scalar and table-returning functions in Power BI.
Detailed technical explanation
How to think about this question
In DAX, the SUMMARIZE function is a table function that returns a new table with grouped rows and aggregated columns. When used inside a measure definition, the measure must be wrapped in an iterator like SUMX or an aggregation like COUNTROWS to convert the table result into a scalar. A common real-world scenario is when a developer accidentally uses EVALUATE or SUMMARIZE directly in a measure, expecting it to behave like a calculated table, but Power BI only exposes scalar measures in the Fields list.
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.
Describe the business value of Microsoft Power Platform — This question tests Describe the business value of Microsoft Power Platform — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The expression creates a table, not a scalar measure. — Option A is correct because DAX measures must return a single scalar value (e.g., a number, date, or string) to appear in the Fields list of a Power BI report. The SUMMARIZE function returns a table with rows and columns, not a scalar, so Power BI treats it as a table expression and does not display it as a measure. Measures that return tables can only be used in other DAX expressions or as calculated tables, not directly in visuals.
What should I do if I get this PL-900 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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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