The answer is ACID transactions ensure data integrity, along with the use of SQL and structured tables, as these are the three core characteristics of a relational database. A relational database organizes data into tables with rows and columns, and SQL (Structured Query Language) is the standard language for querying and manipulating that data, enabling operations like SELECT and INSERT. ACID—Atomicity, Consistency, Isolation, Durability—is the set of properties that guarantee reliable transaction processing and data integrity, even during system failures or concurrent access. On the CompTIA ITF+ FC0-U61 exam, this question tests your understanding of fundamental database concepts, often appearing in a “choose three” format where common traps include non-relational features like “key-value storage” or “schema-less design.” A useful memory tip is to think of the acronym “SAT”: SQL, ACID, and Tables—the three pillars that define a relational database.
FC0-U61 Database Fundamentals Practice Question
This FC0-U61 practice question tests your understanding of database fundamentals. 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? (Choose THREE.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Queries are written using SQL.
Option B is correct because SQL (Structured Query Language) is the standard language used to query and manipulate data in relational databases. It allows users to perform operations such as SELECT, INSERT, UPDATE, and DELETE on structured data stored in tables.
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.
✗
The database uses a hierarchical model.
Why it's wrong here
Hierarchical model is an older model, not relational.
✓
Queries are written using SQL.
Why this is correct
SQL is the standard language for relational databases.
Related concept
Read the scenario before looking for a memorised answer.
✗
The database is schema-less and flexible.
Why it's wrong here
Schema-less is characteristic of NoSQL, not relational databases.
✗
Data is stored as JSON documents.
Why it's wrong here
JSON documents are used in document-oriented NoSQL databases.
✓
Data is stored in tables with rows and columns.
Why this is correct
This is the fundamental structure of a relational database.
Related concept
Read the scenario before looking for a memorised answer.
✓
ACID transactions ensure data integrity.
Why this is correct
ACID is a key property of relational databases.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse the flexible, schema-less nature of NoSQL databases with the rigid, table-based structure of relational databases, leading them to select options like C or D.
Detailed technical explanation
How to think about this question
Relational databases enforce ACID (Atomicity, Consistency, Isolation, Durability) properties to ensure transaction reliability, which is critical for applications like banking systems where data integrity is paramount. Under the hood, SQL queries are parsed, optimized, and executed by the database engine, which uses indexing (e.g., B-trees) to speed up data retrieval. A real-world scenario: an e-commerce platform uses a relational database to manage orders, customers, and inventory, ensuring that a purchase transaction either fully completes or rolls back if stock is insufficient.
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 FC0-U61 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.
Database Fundamentals — This question tests Database Fundamentals — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Queries are written using SQL. — Option B is correct because SQL (Structured Query Language) is the standard language used to query and manipulate data in relational databases. It allows users to perform operations such as SELECT, INSERT, UPDATE, and DELETE on structured data stored in tables.
What should I do if I get this FC0-U61 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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Question Discussion
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