FC0-U71 Data and Database Fundamentals Practice Question
A company needs to store customer orders and ensure that each order is uniquely identified. Which database concept should be used?
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
✓
Primary key
A primary key uniquely identifies each row in a table, ensuring no duplicates and no null values.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Constraint
Why it's wrong here
A constraint enforces rules but does not specifically provide unique identification.
- ✗
Index
Why it's wrong here
An index speeds up queries but does not enforce uniqueness by default.
- ✗
Foreign key
Why it's wrong here
A foreign key references a primary key in another table and does not uniquely identify rows.
- ✓
Primary key
Why this is correct
Correct. A primary key uniquely identifies each row.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This FC0-U71 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 FC0-U71 exam.