DS0-001 Database Structures And SQL Practice Question
Which THREE of the following are common SQL constraints?
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
PRIMARY KEY, UNIQUE, and CHECK are standard SQL constraints used to maintain data integrity.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
GROUP BY
Why it's wrong here
GROUP BY is a query clause.
- ✗
JOIN
Why it's wrong here
JOIN is an operation, not a constraint.
- ✓
PRIMARY KEY
Why this is correct
Ensures unique row identification.
- ✓
UNIQUE
Why this is correct
Ensures column value uniqueness.
- ✓
CHECK
Why this is correct
Validates data against conditions.
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JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed August 2026 · checked against the official CompTIA exam blueprint
This DS0-001 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 DS0-001 exam.