- A
Transactional
Why wrong: Transactional refers to a type of database (OLTP), not a data type.
- B
Semi-structured
JSON is semi-structured as it has organizational properties (key-value pairs) but no rigid schema.
- C
Unstructured
Why wrong: Unstructured data lacks a predefined data model; JSON has structure with keys and values.
- D
Structured
Why wrong: Structured data has a fixed schema, typically in rows and columns; JSON allows flexible schemas.
Question 844 of 1,000
DA0-001 Data Concepts and Environments Practice Question
This DA0-001 practice question tests your understanding of data concepts and environments. 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 data engineer needs to extract data from a REST API and load it into a data warehouse. The data is received in JSON format. Which data type best describes JSON?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"best"Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Semi-structured
JSON (JavaScript Object Notation) is classified as a semi-structured data type because it uses a flexible, self-describing schema with key-value pairs and nested structures, but does not enforce a rigid tabular schema like relational databases. In the context of extracting data from a REST API, JSON allows for varying fields and hierarchical data, which aligns with the semi-structured category.
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.
- ✗
Transactional
Why it's wrong here
Transactional refers to a type of database (OLTP), not a data type.
- ✓
Semi-structured
Why this is correct
JSON is semi-structured as it has organizational properties (key-value pairs) but no rigid schema.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Unstructured
Why it's wrong here
Unstructured data lacks a predefined data model; JSON has structure with keys and values.
- ✗
Structured
Why it's wrong here
Structured data has a fixed schema, typically in rows and columns; JSON allows flexible schemas.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse the presence of structure (keys and values) with being fully structured, overlooking that JSON lacks a fixed schema and allows variability, which places it in the semi-structured category.
Detailed technical explanation
How to think about this question
JSON (RFC 8259) is inherently semi-structured because it supports nested objects and arrays without requiring a predefined schema, enabling schema-on-read rather than schema-on-write. In real-world REST API integrations, a single JSON response may contain optional fields or varying data types for the same key across different records, which would break a rigid structured schema but is perfectly valid in semi-structured formats. This flexibility is why JSON is commonly used in NoSQL databases like MongoDB, which store documents in BSON (Binary JSON).
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 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
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.
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Data Concepts and Environments — study guide chapter
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FAQ
Questions learners often ask
What does this DA0-001 question test?
Data Concepts and Environments — This question tests Data Concepts and Environments — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Semi-structured — JSON (JavaScript Object Notation) is classified as a semi-structured data type because it uses a flexible, self-describing schema with key-value pairs and nested structures, but does not enforce a rigid tabular schema like relational databases. In the context of extracting data from a REST API, JSON allows for varying fields and hierarchical data, which aligns with the semi-structured category.
What should I do if I get this DA0-001 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jul 4, 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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