DP-900 Describe core data concepts Practice Question
This DP-900 practice question tests your understanding of describe core data concepts. Compare every option against the stated constraints before choosing — the best answer satisfies all requirements, not just the most obvious one. 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 social media company stores user profiles as JSON documents where each profile may have different attributes (e.g., some profiles include 'education' while others include 'work history'). The company also stores user-generated posts in a relational database table with fixed columns (PostID, UserID, Content, Timestamp). Which of the following best describes the data types used for user profiles and user posts?
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 the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
User profiles are semi-structured data; posts are structured data.
User profiles are stored as JSON documents with varying attributes, which is a classic example of semi-structured data because it has some organizational properties (key-value pairs) but does not enforce a fixed schema. User posts are stored in a relational database table with fixed columns (PostID, UserID, Content, Timestamp), which is structured data because it adheres to a rigid schema with defined data types and relationships.
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.
✗
User profiles are structured data; posts are unstructured data.
Why it's wrong here
User profiles are not structured because their attributes vary; posts are not unstructured.
✓
User profiles are semi-structured data; posts are structured data.
Why this is correct
Profiles are semi-structured (JSON with optional fields), posts are structured (fixed relational 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.
✗
Both are semi-structured data.
Why it's wrong here
Posts are not semi-structured because they have a fixed schema.
✗
User profiles are unstructured data; posts are structured data.
Why it's wrong here
Profiles are not unstructured; they have key-value pairs and structure.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse 'semi-structured' with 'unstructured' because JSON looks like free-form text, but JSON actually has a defined key-value structure, making it semi-structured, not unstructured.
Detailed technical explanation
How to think about this question
Semi-structured data, such as JSON, uses self-describing schemas where each document can have different fields, making it schema-on-read rather than schema-on-write. In contrast, structured data in a relational database enforces schema-on-write, meaning every row must conform to the predefined columns and data types, which is why user posts are structured. This distinction is critical in data engineering because semi-structured data often requires tools like Azure Cosmos DB or MongoDB, while structured data is best suited for Azure SQL Database or dedicated SQL pools.
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 cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this DP-900 question in full detail.
Describe core data concepts — This question tests Describe core data concepts — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: User profiles are semi-structured data; posts are structured data. — User profiles are stored as JSON documents with varying attributes, which is a classic example of semi-structured data because it has some organizational properties (key-value pairs) but does not enforce a fixed schema. User posts are stored in a relational database table with fixed columns (PostID, UserID, Content, Timestamp), which is structured data because it adheres to a rigid schema with defined data types and relationships.
What should I do if I get this DP-900 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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Question Discussion
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