DA0-002 Data Acquisition and Preparation Practice Question
Exhibit
SELECT COUNT(*) FROM customers WHERE signup_date > '2023-01-01'; Result: 15000 The analyst notices that the result seems low because they expected more signups from that period.
Refer to the exhibit. What is the most likely issue causing the unexpectedly low 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
✓
The signup_date column is in a different date format
If the signup_date column is stored in a different date format (e.g., MM/DD/YYYY), the comparison with '2023-01-01' (YYYY-MM-DD) may not match many records, leading to an unexpectedly low count. Option A is incorrect because indexing affects performance, not the correctness of the count. Option B is incorrect because COUNT(*) aggregates all rows and does not require a GROUP BY clause. Option C is incorrect because a database refresh typically updates data but does not directly cause a mismatch in date comparisons.
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 customers table is indexed incorrectly
Why it's wrong here
Affects performance, not correctness.
- ✗
The query is missing a GROUP BY clause
Why it's wrong here
Not needed for COUNT(*).
- ✗
The database was not refreshed
Why it's wrong here
Does not directly affect query result.
- ✓
The signup_date column is in a different date format
Why this is correct
Format mismatch causes filter mismatch.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This DA0-002 practice question is part of Courseiva's free CompTIA certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the DA0-002 exam.