DA0-002 Data Acquisition and Preparation Practice Question
An e-commerce company is merging customer data from three legacy systems. Two systems use email as unique identifier, but one system allows multiple customers per email. The third uses phone number. To create a unified customer view, the analyst should first:
⚠ Common exam trap
Test-takers frequently assume a single unique identifier (email) can be forced as a primary key, ignoring the real-world data quality issue of non-unique emails, which the question explicitly states.
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
✓
Build a customer matching rule that uses multiple attributes (email, phone, name) with a confidence score
Merging data from systems with different identifier schemas requires a probabilistic matching approach. Using multiple attributes (email, phone, name) with a confidence score allows the analyst to resolve conflicts where email is not unique and phone numbers may be missing or formatted differently, creating a unified customer view without forcing a single key.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Request the IT team to modify the legacy system
Why it's wrong here
Modifying legacy systems may be costly or impossible.
- ✓
Build a customer matching rule that uses multiple attributes (email, phone, name) with a confidence score
Why this is correct
Multi-attribute matching handles non-unique identifiers and improves accuracy.
- ✗
Use email as primary key and ignore conflicts
Why it's wrong here
This would lose data for customers sharing an email.
- ✗
Assign new unique IDs and discard existing identifiers
Why it's wrong here
Discarding existing identifiers prevents linking to source systems.
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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.