The answer is customers who have placed more than 5 orders. This is correct because the query uses a HAVING clause with COUNT(*) > 5, which filters grouped results—specifically groups formed by customer ID—to only those where the count of orders exceeds five. The GROUP BY clause ensures that COUNT(*) tallies orders per customer, so the HAVING condition strictly excludes any customer with five or fewer orders. On the CompTIA Data+ DA0-001 exam, this tests your understanding of the difference between WHERE (which filters rows before grouping) and HAVING (which filters groups after aggregation). A common trap is confusing “greater than 5” with “at least 5,” but the > operator means exactly more than five. For a quick memory tip, think: “HAVING is for groups, WHERE is for rows—COUNT needs HAVING to filter the totals.”
DA0-001 Mining and Acquiring Data Practice Question
This DA0-001 practice question tests your understanding of mining and acquiring 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.
Exhibit
SELECT customer_id, COUNT(*) as order_count FROM orders GROUP BY customer_id HAVING COUNT(*) > 5;
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Customers who have placed more than 5 orders.
The query uses a HAVING clause with COUNT(*) > 5, which filters groups (by customer ID) to only those with more than 5 orders. The GROUP BY customer ID ensures the count is per customer, so the result is customers who have placed more than 5 orders. Option C is correct because the condition is strictly greater than 5, not at least 5.
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.
✗
All orders grouped by customer ID.
Why it's wrong here
The query returns aggregated counts, not individual orders.
✗
Customers who have placed at least 5 orders.
Why it's wrong here
HAVING >5 excludes those with exactly 5 orders.
✓
Customers who have placed more than 5 orders.
Why this is correct
HAVING COUNT(*) > 5 ensures only customers with more than 5 orders are included.
Related concept
Read the scenario before looking for a memorised answer.
✗
All customers who have placed orders.
Why it's wrong here
The query filters on count > 5, not all customers.
Common exam traps
Common exam trap: answer the scenario, not the keyword
CompTIA often tests the distinction between 'at least' (>=) and 'more than' (>) in HAVING clauses, and candidates may misread the condition as including exactly 5 orders.
Detailed technical explanation
How to think about this question
The HAVING clause is applied after GROUP BY and aggregation, unlike WHERE which filters rows before grouping. In SQL, COUNT(*) counts all rows in each group, including NULLs; here, it counts orders per customer. A real-world scenario: a business might use this to identify high-value customers (e.g., those with >5 purchases) for a loyalty program, but must be careful with the comparison operator to avoid off-by-one errors.
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 practitioner preparing for the DA0-001 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
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.
Mining and Acquiring Data — This question tests Mining and Acquiring Data — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Customers who have placed more than 5 orders. — The query uses a HAVING clause with COUNT(*) > 5, which filters groups (by customer ID) to only those with more than 5 orders. The GROUP BY customer ID ensures the count is per customer, so the result is customers who have placed more than 5 orders. Option C is correct because the condition is strictly greater than 5, not at least 5.
What should I do if I get this DA0-001 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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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