Quick Answer
The answer is derived attribute, because total revenue is not stored directly in the database but is computed from existing stored data—specifically, by summing quantity multiplied by price for each customer. In database design, a derived attribute (sometimes called a computed attribute) is any value that can be calculated from other attributes, such as age from birth_date or, here, total_revenue from quantity and price. On the CompTIA Data+ DA0-001 exam, this concept tests your understanding of how data is logically modeled versus physically stored; a common trap is confusing a derived attribute with a stored attribute like customer_id, which is a key, not a calculation. To remember, think of the phrase “compute on demand”—if you can derive it from existing columns, it’s a derived attribute.
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.
A retail company stores customer purchase history in a relational database. The database contains a table 'transactions' with columns: transaction_id, customer_id, product_id, quantity, price, and transaction_date. A data analyst needs to create a report that shows total revenue per customer for the last quarter. Which data concept describes the relationship between customer_id and total revenue?
Foreign key
Why wrong: Foreign key links tables, not derived values.
Composite attribute
Why wrong: Composite attributes are made of sub-attributes, not derived.
Derived attribute
Total revenue is calculated from other attributes, making it derived.
Atomic attribute
Why wrong: customer_id is atomic, but total revenue is derived.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Derived attribute
Total revenue is calculated by summing (quantity * price) for each customer, making it a derived attribute because it is computed from existing stored data (quantity and price) rather than stored directly. In the context of the 'transactions' table, customer_id is a stored key, but total_revenue is not stored; it is derived via aggregation, which matches the definition of a derived attribute in database design.
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.
Foreign key
Why it's wrong here
Foreign key links tables, not derived values.
Composite attribute
Why it's wrong here
Composite attributes are made of sub-attributes, not derived.
Derived attribute
Why this is correct
Total revenue is calculated from other attributes, making it derived.
Related concept
Read the scenario before looking for a memorised answer.
Atomic attribute
Why it's wrong here
customer_id is atomic, but total revenue is derived.
Common exam traps
CompTIA often tests the confusion between a derived attribute (computed from other attributes) and a foreign key (a referential constraint), leading candidates to incorrectly select 'foreign key' because customer_id appears in multiple tables.
Detailed technical explanation
In relational database theory, derived attributes are often implemented as computed columns (e.g., SQL Server's PERSISTED or virtual computed columns) or calculated on the fly via queries using aggregate functions like SUM() with GROUP BY. Under the hood, the database engine may materialize the derived value for performance (stored derived attribute) or compute it each time (virtual derived attribute), but the key distinction is that the value is not independently stored in the table schema. For the DA0-001 exam, remember that derived attributes are not part of the physical table design but are logical constructs in reports or views.
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: Derived attribute — Total revenue is calculated by summing (quantity * price) for each customer, making it a derived attribute because it is computed from existing stored data (quantity and price) rather than stored directly. In the context of the 'transactions' table, customer_id is a stored key, but total_revenue is not stored; it is derived via aggregation, which matches the definition of a derived attribute in database design.
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 30, 2026
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