DS0-001 Data Querying And Analysis Practice Question
Which SQL function is used to convert a NULL value in a query result into a default value, such as 0?
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
✓
COALESCE
COALESCE is a standard function used to return the first non-null value in a list, often used to replace NULLs.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
NVL
Why it's wrong here
NVL is Oracle-specific.
- ✓
COALESCE
Why this is correct
COALESCE is the standard ANSI SQL function for handling NULLs.
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IFNULL
Why it's wrong here
IFNULL is MySQL-specific.
- ✗
ISNULL
Why it's wrong here
ISNULL is specific to certain SQL dialects like T-SQL but not standard SQL.
About these practice questions
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JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed August 2026 · checked against the official CompTIA exam blueprint
This DS0-001 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 DS0-001 exam.