This DA0-001 practice question tests your understanding of comparing and contrasting data concepts. 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.
Which THREE of the following are characteristics of a relational database?
Enforces referential integrity through foreign keys
Referential integrity ensures relationships.
Stores data in key-value pairs
Why wrong: Key-value is NoSQL.
Supports NoSQL document storage
Why wrong: NoSQL is not relational.
Uses Structured Query Language (SQL) for data manipulation
SQL is the standard language.
Data is organized into tables with rows and columns
Tables are fundamental to relational databases.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Enforces referential integrity through foreign keys
Option A is correct because relational databases enforce referential integrity through foreign keys, which ensure that relationships between tables remain consistent. A foreign key in a child table must match a primary key value in the parent table, preventing orphaned records and maintaining data integrity.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Enforces referential integrity through foreign keys
Why this is correct
Referential integrity ensures relationships.
Related concept
Read the scenario before looking for a memorised answer.
Stores data in key-value pairs
Why it's wrong here
Key-value is NoSQL.
Supports NoSQL document storage
Why it's wrong here
NoSQL is not relational.
Uses Structured Query Language (SQL) for data manipulation
Why this is correct
SQL is the standard language.
Related concept
Read the scenario before looking for a memorised answer.
Data is organized into tables with rows and columns
Why this is correct
Tables are fundamental to relational databases.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
The trap here is that candidates may confuse key-value stores or document databases with relational databases, especially when they hear terms like 'keys' or 'documents' in other contexts, but relational databases strictly use tables, rows, columns, and SQL.
Detailed technical explanation
Relational databases use a schema-on-write model where data is normalized into tables with rows and columns, and relationships are defined via foreign keys. Under the hood, the database engine uses B-tree indexes for fast lookups and enforces ACID (Atomicity, Consistency, Isolation, Durability) properties through transaction logs and locking mechanisms. A real-world scenario is an e-commerce system where an Orders table references a Customers table via a foreign key, ensuring no order is linked to a deleted customer.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
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
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FAQ
Comparing and Contrasting Data Concepts — This question tests Comparing and Contrasting Data Concepts — Read the scenario before looking for a memorised answer..
The correct answer is: Enforces referential integrity through foreign keys — Option A is correct because relational databases enforce referential integrity through foreign keys, which ensure that relationships between tables remain consistent. A foreign key in a child table must match a primary key value in the parent table, preventing orphaned records and maintaining data integrity.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 11, 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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