DA0-002 Data Acquisition and Preparation Practice Question
A data analyst is extracting data from a relational database using SQL. Which clause is essential for limiting the rows retrieved to only those needed?
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
✓
WHERE
WHERE. The WHERE clause is used to filter rows from a table based on specified conditions, limiting the result set to only the rows that meet those conditions. Option A (GROUP BY) is incorrect because it groups rows with same values into summary rows, not for filtering. Option B (ORDER BY) is incorrect because it sorts the result set, not filters. Option D (HAVING) is incorrect because it filters groups after aggregation, not individual rows. Therefore, WHERE is essential for limiting rows retrieved.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
GROUP BY
Why it's wrong here
Groups rows for aggregation.
- ✗
ORDER BY
Why it's wrong here
Sorts results.
- ✓
WHERE
Why this is correct
Filters rows based on conditions.
- ✗
HAVING
Why it's wrong here
Filters groups after aggregation.
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