DA0-002 Data Concepts and Environments Practice Question
A database administrator wants to ensure that every value in a column matches values in a primary key column of another table. Which constraint enforces this rule?
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
✓
Foreign key
A foreign key constraint ensures referential integrity by requiring that values in a column match values in the primary key of another table.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Unique constraint
Why it's wrong here
Unique constraint ensures all values are distinct.
- ✗
Primary key
Why it's wrong here
Primary key uniquely identifies rows in its own table.
- ✗
Check constraint
Why it's wrong here
Check constraint validates data based on a condition.
- ✓
Foreign key
Why this is correct
Foreign key enforces referential integrity.
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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.