Quick Answer
The answer is the SQL table, as it is the only data store among the options that holds structured data exclusively. Structured data conforms to a predefined schema with rows and columns, enforcing strict data types and relationships, which is exactly how a SQL table organizes sales transactions. In contrast, blob stores hold unstructured binary data like product images, and text databases store semi-structured or unstructured content such as customer support emails, neither of which require a rigid schema. On the CompTIA Data+ DA0-001 exam, this question tests your ability to distinguish data storage types by their schema enforcement—a common trap is confusing semi-structured data (like JSON in a text database) with fully structured data. A useful memory tip: think of a SQL table as a perfectly organized spreadsheet with labeled columns, while a blob is a digital junk drawer and a text database is a messy notebook.
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.
An e-commerce company stores customer support emails in a text database, product images in a blob store, and sales transactions in a SQL table. Which data store holds only structured data?
Blob store
Why wrong: Incorrect. Images are unstructured binary data.
Text database
Why wrong: Incorrect. Emails are unstructured text.
SQL table
Correct. SQL tables have rows and columns with defined data types.
None
Why wrong: Incorrect. The SQL table stores structured data.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
SQL table
Structured data conforms to a predefined schema with rows and columns, enforcing data types and relationships. A SQL table is the canonical example of a structured data store because it organizes data into tables with fixed schemas, supports ACID transactions, and enables relational queries via SQL. In contrast, blob stores and text databases store unstructured or semi-structured data without a rigid schema.
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.
Blob store
Why it's wrong here
Incorrect. Images are unstructured binary data.
Text database
Why it's wrong here
Incorrect. Emails are unstructured text.
SQL table
Why this is correct
Correct. SQL tables have rows and columns with defined data types.
Related concept
Read the scenario before looking for a memorised answer.
None
Why it's wrong here
Incorrect. The SQL table stores structured data.
Common exam traps
The trap here is that candidates confuse 'structured data' with any data that has some organization (like tags in a blob store or fields in a text document), but only a SQL table enforces a rigid, predefined schema with typed columns and relational constraints, which is the defining characteristic of structured data.
Detailed technical explanation
Under the hood, a SQL table enforces a schema through DDL statements (e.g., CREATE TABLE) that define columns with specific data types (INT, VARCHAR, DATE), constraints (PRIMARY KEY, FOREIGN KEY), and normalization rules. This schema-on-write approach ensures every row adheres to the structure, enabling efficient indexing, joins, and referential integrity. In contrast, blob stores use a flat namespace with key-value access (e.g., GET/PUT operations) and text databases often use schema-on-read, where structure is inferred at query time, making them unsuitable for strict relational queries.
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: SQL table — Structured data conforms to a predefined schema with rows and columns, enforcing data types and relationships. A SQL table is the canonical example of a structured data store because it organizes data into tables with fixed schemas, supports ACID transactions, and enables relational queries via SQL. In contrast, blob stores and text databases store unstructured or semi-structured data without a rigid schema.
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 24, 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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