DA0-002 Data Acquisition and Preparation Practice Question
A data analyst is exploring a sales dataset and wants to identify columns that are likely to be foreign keys. Which TWO characteristics would indicate a foreign key?
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
✓
The column name ends with '_id'
Foreign keys typically match primary keys in another table and have a name suggestive of the relationship.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
The column name ends with '_id'
Why this is correct
Often foreign keys are named with '_id' suffix.
- ✗
The column contains NULL values
Why it's wrong here
NULLs can exist but are not a defining characteristic.
- ✗
The column is of integer data type
Why it's wrong here
Foreign keys can be other data types.
- ✓
The column values are a subset of a primary key column in another table
Why this is correct
Foreign key values must exist in the referenced primary key.
- ✗
The column has a UNIQUE constraint
Why it's wrong here
Foreign keys are not necessarily unique.
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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.