DA0-002 Data Acquisition and Preparation Practice Question
A data analyst is cleaning text data in a SQL database. Which THREE string functions are commonly used to standardize and clean text? (Choose three.)
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
✓
REPLACE
TRIM removes leading/trailing spaces, UPPER/LOWER standardize case, REPLACE substitutes substrings. CONCAT concatenates strings, LENGTH returns length, SUBSTRING extracts part of string.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
REPLACE
Why this is correct
Replaces occurrences of a substring.
- ✓
UPPER
Why this is correct
Converts text to uppercase.
- ✗
LENGTH
Why it's wrong here
Returns string length, not a cleaning function.
- ✓
TRIM
Why this is correct
Removes leading and trailing spaces.
- ✗
CONCAT
Why it's wrong here
Joins strings together, not typically used for cleaning.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This DA0-002 practice question is part of Courseiva's free CompTIA certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the DA0-002 exam.