DA0-002 Data Acquisition and Preparation Practice Question
A data analyst is writing a query to rank products by total sales amount within each category. They want ties to have the same rank and no gaps in the ranking sequence. Which window function should they use?
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 the same rank to ties and does not skip subsequent ranks. RANK() also assigns same rank to ties but skips numbers, creating gaps.
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 a unique sequential number, ties would get different numbers.
- ✓
DENSE_RANK()
Why this is correct
Correct. DENSE_RANK() gives same rank to ties and no gaps.
- ✗
RANK()
Why it's wrong here
RANK() gives same rank to ties but leaves gaps.
- ✗
NTILE()
Why it's wrong here
NTILE() divides rows into buckets, not ranking.
Go deeper
Related to this question
About these practice questions
Courseiva writes every DA0-002 question from scratch — 986 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 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.