DA0-002 Data Acquisition and Preparation Practice Question
A data analyst wants to identify customers whose last name starts with 'Mc' from the 'customers' table. Which WHERE clause condition 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
✓
last_name LIKE 'Mc%'
The LIKE operator with '%' wildcard matches any sequence of characters after 'Mc'.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
last_name LIKE 'Mc_'
Why it's wrong here
The underscore matches exactly one character, so only 3-letter names starting with Mc would be matched.
- ✓
last_name LIKE 'Mc%'
Why this is correct
Correct: % matches any sequence of characters after 'Mc'.
- ✗
last_name IN ('Mc%')
Why it's wrong here
IN operator does not support wildcards; it looks for exact matches.
- ✗
last_name = 'Mc%'
Why it's wrong here
This would look for an exact match with the string 'Mc%'.
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