DS0-001 Database Structures And SQL Practice Question
A developer needs to calculate the running total of sales. Which SQL feature is most appropriate?
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
✓
Window Function
Window functions, specifically SUM() OVER(), allow calculations across a set of rows related to the current row without collapsing the result into a single group.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
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GROUP BY
Why it's wrong here
GROUP BY collapses data, losing individual row detail.
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Trigger
Why it's wrong here
Triggers are not for ad-hoc calculation queries.
- ✓
Window Function
Why this is correct
Window functions handle running totals efficiently.
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Recursive CTE
Why it's wrong here
Recursive CTEs are for hierarchical traversal.
About these practice questions
Courseiva writes every DS0-001 question from scratch — 216 in total, each with an explanation and a wrong-answer breakdown. None are copied from real exams or dumps. Learn why practice questions differ from exam dumps →
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.