DA0-002 Data Acquisition and Preparation Practice Question
A data analyst runs the following query: SELECT DISTINCT city FROM customers. What is the primary purpose of using the DISTINCT keyword in this query?
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
✓
To remove duplicate city names
DISTINCT removes duplicate rows from the result set. In this query, it returns each unique city name only once.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
To sort the cities alphabetically
Why it's wrong here
Sorting is done with ORDER BY, not DISTINCT.
- ✗
To count the number of cities
Why it's wrong here
Counting requires COUNT() aggregation.
- ✗
To filter cities that start with a specific letter
Why it's wrong here
Filtering is done with WHERE and LIKE.
- ✓
To remove duplicate city names
Why this is correct
DISTINCT eliminates duplicate rows, returning unique city values.
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