- A
View
Why wrong: A view is a virtual table based on a query, not used for enforcing relationships.
- B
Index
Why wrong: An index speeds up data retrieval but does not enforce referential integrity.
- C
Primary key
Why wrong: A primary key uniquely identifies each row within its own table, but does not enforce relationships between tables.
- D
Foreign key
A foreign key links tables by referencing a primary key in another table, maintaining referential integrity.
Question 9 of 1,000
DA0-001 Data Concepts and Environments Practice Question
This DA0-001 practice question tests your understanding of data concepts and environments. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A retail company wants to analyze customer purchase patterns over time. The data is stored in a relational database with tables for Customers, Orders, and Products. Which database concept should be used to ensure that each order references a valid customer?
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
✓
Foreign key
A foreign key constraint enforces referential integrity by ensuring that every value in the 'customer_id' column of the Orders table matches a valid primary key value in the Customers table. This prevents orphaned records and guarantees that each order references an existing customer.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
View
Why it's wrong here
A view is a virtual table based on a query, not used for enforcing relationships.
- ✗
Index
Why it's wrong here
An index speeds up data retrieval but does not enforce referential integrity.
- ✗
Primary key
Why it's wrong here
A primary key uniquely identifies each row within its own table, but does not enforce relationships between tables.
- ✓
Foreign key
Why this is correct
A foreign key links tables by referencing a primary key in another table, maintaining referential integrity.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the distinction between a primary key (which enforces uniqueness within a table) and a foreign key (which enforces relationships between tables), leading candidates to mistakenly choose primary key when the question asks about cross-table validation.
Detailed technical explanation
How to think about this question
Under the hood, a foreign key creates a constraint that is checked on every INSERT or UPDATE to the referencing table; if the referenced primary key does not exist, the operation is rejected. In MySQL, the InnoDB storage engine automatically creates an index on the foreign key column to speed up joins and cascading operations. A real-world scenario is when a customer is deleted from the Customers table; a foreign key with ON DELETE CASCADE can automatically remove all associated orders, preventing data inconsistency.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A practitioner preparing for the DA0-001 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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FAQ
Questions learners often ask
What does this DA0-001 question test?
Data Concepts and Environments — This question tests Data Concepts and Environments — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Foreign key — A foreign key constraint enforces referential integrity by ensuring that every value in the 'customer_id' column of the Orders table matches a valid primary key value in the Customers table. This prevents orphaned records and guarantees that each order references an existing customer.
What should I do if I get this DA0-001 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jul 4, 2026
This DA0-001 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 DA0-001 exam.
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