DA0-002 Data Acquisition and Preparation Practice Question
A data analyst wants to assign a unique sequential integer to each row in a result set, starting at 1, based on the order of the 'sales_amount' column descending. 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
✓
ROW_NUMBER() OVER (ORDER BY sales_amount DESC)
ROW_NUMBER() assigns a unique sequential integer to each row within a partition, starting at 1.
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() OVER (ORDER BY sales_amount DESC)
Why it's wrong here
DENSE_RANK allows ties without gaps.
- ✗
RANK() OVER (ORDER BY sales_amount DESC)
Why it's wrong here
RANK allows ties and leaves gaps.
- ✗
NTILE(1) OVER (ORDER BY sales_amount DESC)
Why it's wrong here
NTILE divides rows into buckets; with 1 bucket it assigns 1 to all.
- ✓
ROW_NUMBER() OVER (ORDER BY sales_amount DESC)
Why this is correct
Correct: assigns sequential numbers based on the order.
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