DA0-002 Data Acquisition and Preparation Practice Question
In a table 'sales_team' with columns 'salesperson', 'quarter', and 'revenue', an analyst wants to assign a rank to each salesperson within their quarter based on revenue, with the highest revenue getting rank 1. However, if two salespeople have the same revenue, they should receive the same rank, and the next rank should be the next consecutive integer (no 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 with no gaps for ties, whereas RANK() leaves 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.
- ✗
RANK()
Why it's wrong here
RANK() leaves gaps after ties.
- ✗
NTILE(4)
Why it's wrong here
NTILE divides into buckets, not ranking.
- ✓
DENSE_RANK()
Why this is correct
DENSE_RANK() assigns consecutive ranks even with ties.
- ✗
ROW_NUMBER()
Why it's wrong here
ROW_NUMBER() assigns unique sequential numbers, ties get arbitrary order.
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Written by Johnson Ajibi, MSc IT Security
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