The correct order from most structured to least structured is relational data, JSON, and images. This ordering reflects the fundamental classification of data types in Azure Data Fundamentals: relational data enforces a rigid schema with fixed columns and constraints, making it fully structured; JSON documents are semi-structured because they use key-value pairs with optional fields like metadata, allowing flexibility without a predefined schema; and JPEG images are unstructured binary data with no inherent organizational structure. On the DP-900 exam, this concept tests your ability to distinguish between structured, semi-structured, and unstructured data across Azure services like Azure SQL Database, Cosmos DB, and Blob Storage. A common trap is misplacing JSON as unstructured due to its variable fields, but remember that any data with tags or keys—even optional ones—is semi-structured. For a quick memory tip, think of a filing cabinet: relational data is a labeled folder with fixed slots, JSON is a folder with sticky notes that can be added or removed, and images are loose photographs tossed in a drawer.
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 company stores customer data in a relational database with columns like CustomerID, Name, and Email. They also store product images as JPEG files in Azure Blob Storage, and customer feedback as JSON documents that contain varying fields such as rating, comments, and optional metadata. Which of the following correctly orders these data types from most structured to least structured?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "least"
Why it matters: You want the option with minimum overhead, fewest steps, or lowest impact — not the most feature-rich or comprehensive answer.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Relational data, JSON, images
Relational data (CustomerID, Name, Email) is the most structured because it enforces a fixed schema with defined data types and constraints. JSON documents (customer feedback) are semi-structured: they have a flexible schema with optional fields like metadata, but still use key-value pairs. Images (JPEG files) are unstructured binary data with no inherent schema. Option C correctly orders them from most structured (relational) to least structured (images).
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.
✗
Relational data, images, JSON
Why it's wrong here
Images are unstructured, not semi-structured like JSON, so this order is incorrect.
✗
Images, JSON, relational data
Why it's wrong here
Images are unstructured and relational data is structured, so this is reversed.
The clue word "least" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
JSON, relational data, images
Why it's wrong here
Relational data is more structured than JSON, so this order is incorrect.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse 'semi-structured' with 'unstructured' or assume images have more structure than JSON because they are stored in a named file, but the key distinction is schema rigidity: relational > JSON > binary blobs.
Detailed technical explanation
How to think about this question
Structured data relies on a predefined schema (e.g., SQL tables with columns like CustomerID INT NOT NULL), enabling ACID transactions and efficient indexing. Semi-structured JSON uses self-describing key-value pairs, often stored in Azure Cosmos DB or Blob Storage as individual documents, allowing schema-on-read. Unstructured data like JPEG images are stored as binary large objects (BLOBs) with no internal queryable structure, requiring metadata (e.g., blob name, tags) for organization.
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: Relational data, JSON, images — Relational data (CustomerID, Name, Email) is the most structured because it enforces a fixed schema with defined data types and constraints. JSON documents (customer feedback) are semi-structured: they have a flexible schema with optional fields like metadata, but still use key-value pairs. Images (JPEG files) are unstructured binary data with no inherent schema. Option C correctly orders them from most structured (relational) to least structured (images).
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: "least". You want the option with minimum overhead, fewest steps, or lowest impact — not the most feature-rich or comprehensive answer.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
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These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. A logistics company collects sensor data from delivery trucks. Each sensor sends a JSON message that includes a fixed set of core fields (truck ID, timestamp) but also includes optional fields such as temperature, humidity, and engine diagnostics depending on the sensor type. The JSON structure varies between messages. How should this data be classified?
medium
A.Structured data
✓ B.Semi-structured data
C.Unstructured data
D.Relational data
Why B: The JSON messages contain a fixed set of core fields (truck ID, timestamp) but also include optional fields that vary per message, meaning the data has a flexible schema. This mixture of structured fields and variable attributes is the defining characteristic of semi-structured data, which does not require a rigid schema like a relational table but still has organizational properties (e.g., key-value pairs). In Azure, this type of data is commonly stored in services like Azure Cosmos DB or Azure Blob Storage with JSON format.
Variation 2. A logistics company collects data from fleet sensors. Each sensor sends a JSON message containing the vehicle ID, timestamp, and a variable set of measurements such as engine temperature, tire pressure, and fuel level. The structure of the JSON message differs between sensor types and sometimes includes optional fields. How should this data be classified?
easy
A.Structured data
✓ B.Semi-structured data
C.Unstructured data
D.Relational data
Why B: The data is semi-structured because it conforms to a schema (JSON format with fields like vehicle ID and timestamp) but allows variability in structure, such as optional fields and different sets of measurements per sensor type. This flexibility is a hallmark of semi-structured data, which does not require a rigid tabular schema like structured data but still contains tags or markers to separate data elements.
Variation 3. A marketing company collects data from social media feeds including text posts, images, and videos. The data arrives in various formats with no fixed structure or schema. This type of data is best described as:
easy
A.A) Structured data
B.B) Semi-structured data
✓ C.C) Unstructured data
D.D) Relational data
Why C: Unstructured data lacks a predefined data model or schema, making it ideal for storing text posts, images, and videos that arrive in varied formats. Unlike structured or semi-structured data, unstructured data cannot be easily organized into rows and columns or parsed with tags, which is why option C is correct for this scenario.
Variation 4. A retail company collects data from online transactions including order ID, customer details, product IDs, quantities, and timestamps. The data is stored in a relational database and used for order processing and inventory management. Which characteristic of this data makes it structured?
easy
✓ A.It is stored in rows and columns with a predefined schema.
B.It is stored as key-value pairs.
C.It is stored in JSON format with variable fields.
D.It is stored in unstructured text files.
Why A: Option A is correct because structured data is defined by a fixed schema where each entity (e.g., orders) is stored in rows and columns with predefined data types (e.g., INT for order ID, VARCHAR for customer details). This relational model enforces consistency and enables efficient querying via SQL for order processing and inventory management.
Variation 5. A company collects temperature readings from IoT sensors every second. Each reading includes a timestamp, sensor ID, and temperature value. The data is used for real-time monitoring and historical trend analysis. Which type of data is this most likely classified as?
medium
✓ A.Structured data
B.Semi-structured data
C.Unstructured data
D.Streaming data
Why A: The data consists of timestamp, sensor ID, and temperature value, each with a defined data type and relationship, fitting a tabular schema (rows and columns) typical of relational databases. This structured format enables efficient querying for real-time monitoring and historical trend analysis using SQL-based systems like Azure SQL Database or Azure Synapse Analytics.
Variation 6. A hospital collects patient data from multiple sources. Source A stores patient vitals as a continuous stream of readings from wearable devices. Source B stores historical medical records in a relational database with fixed columns (PatientID, Diagnosis, AdmissionDate). Source C stores doctor's notes as unstructured text files. Which statement correctly describes the structure of data from these sources?
medium
A.Source A is semi-structured, Source B is structured, Source C is unstructured.
✓ B.Source A is structured, Source B is structured, Source C is unstructured.
C.Source A is structured, Source B is unstructured, Source C is semi-structured.
D.Source A is semi-structured, Source B is semi-structured, Source C is unstructured.
Why B: Source A stores patient vitals as a continuous stream from wearable devices, which is structured data because it typically consists of time-stamped numeric readings with a fixed schema (e.g., timestamp, heart rate, blood pressure). Source B uses a relational database with fixed columns (PatientID, Diagnosis, AdmissionDate), which is classic structured data. Source C contains unstructured text files (doctor's notes) with no predefined schema. Therefore, Option B correctly identifies all three sources.
Variation 7. A company stores customer contact information in a table with columns for CustomerID, Name, Email, and Phone. They also store customer support chat transcripts as plain text files. Which of the following correctly classifies these data types?
easy
A.Both are structured data
B.Customer contact information is structured; chat transcripts are semi-structured
✓ C.Customer contact information is structured; chat transcripts are unstructured
D.Both are semi-structured
Why C: Customer contact information stored in a table with columns like CustomerID, Name, Email, and Phone is structured data because it has a fixed schema with rows and columns. Chat transcripts stored as plain text files have no predefined schema or organization, making them unstructured data. Therefore, option C correctly classifies the contact info as structured and the chat transcripts as unstructured.
Variation 8. A company stores customer information in a table with columns CustomerID, Name, Address, and PhoneNumber. Every row has values for all these columns, and the data follows a fixed schema. Which type of data does this represent?
easy
A.Unstructured data
B.Semi-structured data
✓ C.Structured data
D.Streaming data
Why C: Structured data conforms to a fixed schema where each row has the same columns and data types. The table with CustomerID, Name, Address, and PhoneNumber, where every row contains values for all columns, perfectly fits this definition. This is typical of relational database tables (e.g., in Azure SQL Database) where the schema is enforced at the table level.
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