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 TWO of the following are considered structured data?
A PDF report with free-form text
Why wrong: PDF text is often unstructured.
A relational database table
Tables have a fixed schema.
A JPEG image of a product
Why wrong: Image is unstructured.
A JSON file with nested key-value pairs
Why wrong: JSON is semi-structured.
A CSV file containing sales records
CSV has rows and columns.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
A relational database table
Option B is correct because a relational database table stores data in a predefined schema of rows and columns, where each column has a fixed data type. This rigid structure allows for efficient querying, indexing, and relational operations, making it a classic example of structured data.
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.
A PDF report with free-form text
Why it's wrong here
PDF text is often unstructured.
A relational database table
Why this is correct
Tables have a fixed schema.
Related concept
Read the scenario before looking for a memorised answer.
A JPEG image of a product
Why it's wrong here
Image is unstructured.
A JSON file with nested key-value pairs
Why it's wrong here
JSON is semi-structured.
A CSV file containing sales records
Why this is correct
CSV has rows and columns.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
The trap here is that candidates often mistake semi-structured data (like JSON) for structured data because it has key-value pairs, but the DA0-001 exam strictly defines structured data as having a fixed, predefined schema—typically found in relational databases or CSV files with consistent column headers.
Detailed technical explanation
Structured data relies on a rigid schema defined by data definition language (DDL) statements, such as CREATE TABLE in SQL, which enforces data types (e.g., INT, VARCHAR) and constraints (e.g., NOT NULL, FOREIGN KEY). This schema enables ACID transactions and efficient indexing via B-trees or hash indexes. In contrast, semi-structured formats like JSON use a schema-on-read approach, where the structure is inferred at query time, leading to potential performance trade-offs in analytics.
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: A relational database table — Option B is correct because a relational database table stores data in a predefined schema of rows and columns, where each column has a fixed data type. This rigid structure allows for efficient querying, indexing, and relational operations, making it a classic example of structured data.
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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