The correct answer is that the CSV files are structured, the JSON files are semi-structured, and the TIFF images are unstructured. This categorization hinges on how each data type enforces a schema: structured data, like the CSV from a relational database, relies on a rigid, predefined table of rows and columns, while semi-structured data, such as JSON with varying fields, uses tags or keys to organize information without a fixed schema, and unstructured data, like scanned handwritten TIFF images, lacks any internal data model or organization. On the Microsoft Azure Data Fundamentals DP-900 exam, this concept tests your ability to classify data sources for storage decisions, such as choosing between Azure SQL Database (structured), Azure Cosmos DB (semi-structured), and Azure Data Lake Storage (unstructured). A common trap is confusing JSON as unstructured because its fields vary, but remember that any data with metadata tags or key-value pairs is semi-structured. For a quick memory tip, think of a filing cabinet: structured is a labeled spreadsheet, semi-structured is a folder of sticky notes with headers, and unstructured is a pile of photographs.
DP-900 Describe core data concepts Practice Question
This DP-900 practice question tests your understanding of describe core 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.
A company is building a data lake and collects data from three sources: (1) a relational database exporting CSV files with fixed columns for customer records, (2) API responses stored as JSON files with varying fields for product reviews, and (3) scanned handwritten notes stored as TIFF images. Which statement correctly categorizes these data by structure type?
Option A is correct because CSV files from a relational database have a fixed schema (rows and columns), making them structured data. JSON files from API responses with varying fields are semi-structured, as they use tags/keys to organize data without a rigid schema. TIFF images of handwritten notes are unstructured, lacking a predefined data model or organization.
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.
Common exam trap: answer the scenario, not the keyword
The trap here is confusing semi-structured data (like JSON with varying fields) with unstructured data, or assuming that any file format (like CSV) is always structured regardless of content consistency.
Detailed technical explanation
How to think about this question
Structured data adheres to a strict schema (e.g., SQL tables), while semi-structured data uses self-describing formats like JSON or XML with flexible schemas. Unstructured data, such as TIFF images, lacks any inherent structure and requires specialized processing (e.g., OCR) to extract meaning. In a data lake, these types are often stored in separate zones (raw, curated) to optimize ingestion and analytics.
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: 1: structured, 2: semi-structured, 3: unstructured — Option A is correct because CSV files from a relational database have a fixed schema (rows and columns), making them structured data. JSON files from API responses with varying fields are semi-structured, as they use tags/keys to organize data without a rigid schema. TIFF images of handwritten notes are unstructured, lacking a predefined data model or organization.
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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