DA0-002 Data Acquisition and Preparation Practice Question
A data analyst is using a window function to assign a unique rank to each employee within their department based on salary, with ties receiving the same rank and leaving gaps. Which 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
✓
RANK()
RANK() assigns the same rank to ties and leaves gaps (e.g., 1,1,3). DENSE_RANK() does not leave 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.
- ✗
DENSE_RANK()
Why it's wrong here
DENSE_RANK() assigns same rank to ties but without gaps.
- ✓
RANK()
Why this is correct
RANK() assigns same rank to ties and leaves gaps.
- ✗
ROW_NUMBER()
Why it's wrong here
ROW_NUMBER() assigns a unique sequential number, no ties.
- ✗
NTILE()
Why it's wrong here
NTILE() divides rows into buckets.
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