DP-900 Describe core data concepts Practice Question
This DP-900 practice question tests your understanding of describe core data concepts. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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 data in a relational database table with columns for CustomerID, Name, and Email. Product reviews are stored as JSON documents where each document contains review text and a rating. Product images are stored as binary files in Azure Blob Storage. Which of the following correctly categorizes these data types in order: relational table, JSON documents, binary images?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Structured, semi-structured, unstructured
A is correct because relational tables enforce a fixed schema (columns with defined data types), making them structured data. JSON documents have a flexible schema (key-value pairs) but still contain metadata, classifying them as semi-structured. Binary image files in Azure Blob Storage have no inherent structure or schema, making them unstructured data. This matches the order: structured, semi-structured, unstructured.
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.
✓
Structured, semi-structured, unstructured
Why this is correct
Correct. Relational tables are structured (fixed schema), JSON is semi-structured (flexible schema), and binary images are unstructured (no schema).
Related concept
Read the scenario before looking for a memorised answer.
✗
Semi-structured, structured, unstructured
Why it's wrong here
Incorrect. The relational table is structured, not semi-structured.
✗
Unstructured, semi-structured, structured
Why it's wrong here
Incorrect. The relational table is structured, not unstructured.
✗
Structured, unstructured, semi-structured
Why it's wrong here
Incorrect. JSON is semi-structured, not unstructured.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse semi-structured data (like JSON) with unstructured data because JSON appears 'flexible,' but it still has a defined key-value structure, whereas truly unstructured data (binary blobs) has no schema at all.
Detailed technical explanation
How to think about this question
Under the hood, structured data (e.g., Azure SQL Database tables) uses a rigid schema enforced by the database engine, enabling ACID transactions and efficient indexing. Semi-structured data like JSON in Azure Cosmos DB or Azure Blob Storage supports schema-on-read, allowing nested objects and arrays without predefining columns. Unstructured data in Azure Blob Storage is stored as raw bytes (e.g., PNG, JPEG) with no internal metadata, accessed via REST APIs using HTTP GET/PUT requests. A real-world scenario: a retail company might query the relational table for customer demographics, parse JSON reviews for sentiment analysis, and serve binary images directly from Blob Storage URLs.
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 media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
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: Structured, semi-structured, unstructured — A is correct because relational tables enforce a fixed schema (columns with defined data types), making them structured data. JSON documents have a flexible schema (key-value pairs) but still contain metadata, classifying them as semi-structured. Binary image files in Azure Blob Storage have no inherent structure or schema, making them unstructured data. This matches the order: structured, semi-structured, unstructured.
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.
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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