DA0-002 Data Acquisition and Preparation Practice Question
A data analyst is performing data profiling on a customer table. Which metric provides the number of unique values in a column?
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
✓
Cardinality
Cardinality refers to the number of distinct values in a column.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
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Row count
Why it's wrong here
Row count is total number of rows.
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Cardinality
Why this is correct
Cardinality is the number of distinct values.
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Standard deviation
Why it's wrong here
Standard deviation measures spread of numerical data.
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Null count
Why it's wrong here
Null count is number of missing values.
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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.