DS0-001 Data Querying And Analysis Practice Question
Which THREE of the following SQL aggregate functions are commonly supported in most relational databases?
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
✓
SUM
SUM, COUNT, and AVG are fundamental aggregate functions supported across virtually all SQL standards.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
SUM
Why this is correct
Calculates the total.
- ✗
CONCAT
Why it's wrong here
CONCAT is a string manipulation function, not aggregate.
- ✓
AVG
Why this is correct
Calculates the mean.
- ✗
SUBSTR
Why it's wrong here
SUBSTR is a string extraction function.
- ✓
COUNT
Why this is correct
Counts occurrences.
About these practice questions
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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.