DA0-002 Data Acquisition and Preparation Practice Question
An analyst needs to count the number of orders per customer but only for customers who have placed more than 5 orders. Which SQL construct allows filtering after aggregation?
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
✓
HAVING COUNT(*) > 5
HAVING is used to filter groups based on aggregate conditions, unlike WHERE which filters before aggregation.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
WHERE COUNT(*) > 5
Why it's wrong here
WHERE cannot use aggregate functions directly.
- ✗
LIMIT 5
Why it's wrong here
LIMIT limits rows, not filtering groups.
- ✓
HAVING COUNT(*) > 5
Why this is correct
HAVING filters groups after aggregation.
- ✗
ORDER BY COUNT(*) > 5
Why it's wrong here
ORDER BY sorts results.
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