DA0-002 Visualization and Reporting Practice Question
A data analyst is using Power BI to create a report that shows sales by region. The data includes duplicate rows for some transactions due to a data entry error. The analyst needs to count only unique transactions. Which DAX function should be used to create a measure for unique count?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
DISTINCTCOUNT
DISTINCTCOUNT is the DAX function specifically for counting unique values in a column.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
COUNT
Why it's wrong here
COUNT counts non-empty cells, including duplicates.
- ✓
DISTINCTCOUNT
Why this is correct
DISTINCTCOUNT counts distinct values in a column, ignoring duplicates.
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COUNTROWS
Why it's wrong here
COUNTROWS counts all rows, including duplicates.
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SUMX
Why it's wrong here
SUMX iterates over a table and sums an expression; not for counting unique values.
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