DA0-002 Data Acquisition and Preparation Practice Question
A data analyst is using SQL to filter a sales table for transactions that occurred in either 'Q1' or 'Q3' of 2023 and have a sale amount greater than $100. Which WHERE clause correctly implements this condition?
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 quarter = 'Q1' AND amount > 100 OR quarter = 'Q3' AND amount > 100
Both C and D correctly implement the filter. SQL's operator precedence gives AND higher priority than OR, so option C is parsed as (quarter = 'Q1' AND amount > 100) OR (quarter = 'Q3' AND amount > 100), which is equivalent to (quarter = 'Q1' OR quarter = 'Q3') AND amount > 100. Option D expresses the same condition directly with parentheses.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
WHERE quarter IN ('Q1','Q3') OR amount > 100
Why it's wrong here
This would include any transaction with amount>100 regardless of quarter.
- ✗
WHERE quarter = 'Q1' OR quarter = 'Q3' AND amount > 100
Why it's wrong here
Missing parentheses; AND binds tighter, so this filters amount>100 only for Q3, not Q1.
- ✓
WHERE quarter = 'Q1' AND amount > 100 OR quarter = 'Q3' AND amount > 100
Why this is correct
This is logically equivalent but redundant and not the standard concise form.
- ✓
WHERE (quarter = 'Q1' OR quarter = 'Q3') AND amount > 100
Why this is correct
Correct: groups the OR and then AND with amount condition.
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