DA0-002 Data Acquisition and Preparation Practice Question
A data analyst wants to concatenate first_name and last_name columns with a space in between. Which string function combination should be used in SQL?
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
✓
CONCAT(first_name, ' ', last_name)
CONCAT joins strings; adding a space produces 'First Last'.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
first_name + ' ' + last_name
Why it's wrong here
The + operator is not standard SQL for concatenation (though used in some DBMS).
- ✗
SUBSTRING(first_name, 1, 1) + '.' + last_name
Why it's wrong here
This creates an initial, not a full concatenation.
- ✗
CONCAT(first_name, last_name)
Why it's wrong here
This produces 'FirstLast' without a space.
- ✓
CONCAT(first_name, ' ', last_name)
Why this is correct
This adds a space between the two names.
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