DP-900 Describe core data concepts Practice Question
A hospital stores patient records. Each record includes a PatientID (integer), Name (text), DateOfBirth (date), and MRI scan images (binary files). Which classification best describes the MRI scan images?
⚠ Common exam trap
Microsoft often tests the misconception that any data stored in a database (e.g., as a BLOB) is structured, but the classification depends on the data's internal format, not its storage location.
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
✓
Unstructured data
MRI scan images are binary files that lack a predefined data model or schema, making them unstructured data. Unlike structured data (e.g., rows in a SQL table) or semi-structured data (e.g., JSON with tags), binary image files cannot be easily queried or organized using traditional relational database tools without additional processing.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
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Structured data
Why it's wrong here
Structured data is organized according to a rigid, predefined schema, typically in rows and columns within relational tables, such as a patient registry with fields for name, ID, and admission date. An MRI scan image is a binary file containing pixel intensities and does not conform to any tabular schema, so it cannot be classified as structured data.
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Semi-structured data
Why it's wrong here
Semi-structured data, such as JSON or XML, contains tags, markers, or a hierarchy that provides self-describing structure while allowing flexibility in fields. Although a DICOM file includes metadata, the core MRI image is a binary pixel array without internal tags or nested elements, so it is not semi-structured in the same sense as JSON or XML.
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Unstructured data
Why this is correct
Unstructured data has no predefined data model or schema and includes binary files like images, videos, and audio recordings. An MRI scan is exactly that—a binary blob—where the pixel data is not inherently organized into rows/columns, and meaning must be extracted via computer vision or human interpretation, making it a classic example of unstructured data.
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Streaming data
Why it's wrong here
Streaming data refers to a continuous, real-time sequence of events generated from sources such as IoT sensors, social media feeds, or network logs. MRI scans are static files captured at a specific time and stored, not an ongoing flow of data, so they are not streaming data.
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Related to this question
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Data Roles and Core Concepts
Key term
Unstructured data
Unstructured data is information that does not have a predefined data model or is not organized in a predefined manner, making it difficult for traditional databases to read and process.
Key term
Relational database
A relational database organizes data into tables with rows and columns, where each table relates to others using unique keys, allowing efficient storage, retrieval, and manipulation of structured information.
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