DA0-002 Data Acquisition and Preparation Practice Question
A data analyst is performing data profiling on a customer table. Which TWO metrics are commonly used to assess the completeness of a column? (Select TWO.)
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
✓
Row count
Completeness is measured by null count and row count; null count shows missing values, row count gives total rows.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Row count
Why this is correct
Total rows; used to compute percentage complete.
- ✓
Null count
Why this is correct
Number of missing values.
- ✗
Cardinality
Why it's wrong here
Number of distinct values, not completeness.
- ✗
Mean
Why it's wrong here
Average value, not completeness.
- ✗
Standard deviation
Why it's wrong here
Measure of spread, not completeness.
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