DA0-002 Data Acquisition and Preparation Practice Question
A data analyst is writing a query to rank products by total sales within each category, showing dense rank and avoiding gaps. Which window function 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
✓
DENSE_RANK()
DENSE_RANK() assigns ranks without gaps, so tied values get the same rank and the next rank is the next consecutive number.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
ROW_NUMBER()
Why it's wrong here
ROW_NUMBER() assigns unique sequential numbers, not ranks with ties.
- ✓
DENSE_RANK()
Why this is correct
DENSE_RANK() ranks without gaps.
- ✗
NTILE()
Why it's wrong here
NTILE() divides rows into buckets.
- ✗
RANK()
Why it's wrong here
RANK() leaves gaps after ties.
Go deeper
Related to this question
About these practice questions
This DA0-002 question is part of Courseiva's 986-question bank — original exam-style content with full explanations and wrong-answer analysis, never real exam questions or exam dumps. Learn why practice questions differ from exam dumps →
JA
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.