DP-900 Describe core data concepts Practice Question
This DP-900 practice question tests your understanding of describe core data concepts. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 hospital system stores patient medical records. Each record includes structured data like patient ID, name, date of birth, and also includes unstructured data like doctor's notes and X-ray images. Which type of data is the doctor's notes?
Why wrong: Structured data adheres to a fixed schema with clearly defined fields (e.g., patient ID, date of birth). Doctor's notes are free text and do not fit a schema.
B
B. Semi-structured data
Why wrong: Semi-structured data (e.g., JSON, XML) has some structure like tags or key-value pairs. Doctor's notes are plain text without such organizational markers.
C
C. Unstructured data
Unstructured data lacks a predefined data model or schema. Doctor's notes are free-form text, making them unstructured.
D
D. Relational data
Why wrong: Relational data is a type of structured data stored in tables with relationships. Doctor's notes are not relational.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
C. Unstructured data
Doctor's notes are unstructured data because they consist of free-form text that does not follow a predefined data model or schema. Unlike structured data (e.g., patient ID, name) which fits neatly into rows and columns, doctor's notes lack a fixed format and cannot be easily queried using traditional relational database tools without additional processing.
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.
✗
A. Structured data
Why it's wrong here
Structured data adheres to a fixed schema with clearly defined fields (e.g., patient ID, date of birth). Doctor's notes are free text and do not fit a schema.
✗
B. Semi-structured data
Why it's wrong here
Semi-structured data (e.g., JSON, XML) has some structure like tags or key-value pairs. Doctor's notes are plain text without such organizational markers.
✓
C. Unstructured data
Why this is correct
Unstructured data lacks a predefined data model or schema. Doctor's notes are free-form text, making them unstructured.
Related concept
Read the scenario before looking for a memorised answer.
✗
D. Relational data
Why it's wrong here
Relational data is a type of structured data stored in tables with relationships. Doctor's notes are not relational.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may confuse 'unstructured' with 'semi-structured' because doctor's notes might contain some implicit structure (e.g., date headers), but the key exam distinction is that unstructured data lacks a formal schema or metadata tags, unlike semi-structured data such as JSON or XML.
Detailed technical explanation
How to think about this question
In Azure, unstructured data like doctor's notes is often stored in Azure Blob Storage or Azure Data Lake Storage, while structured data resides in Azure SQL Database. For analysis, services like Azure Cognitive Search can extract insights from unstructured text using AI enrichment pipelines, or Azure Machine Learning can process natural language. This distinction is critical for choosing the correct storage and processing service in a data solution.
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: C. Unstructured data — Doctor's notes are unstructured data because they consist of free-form text that does not follow a predefined data model or schema. Unlike structured data (e.g., patient ID, name) which fits neatly into rows and columns, doctor's notes lack a fixed format and cannot be easily queried using traditional relational database tools without additional processing.
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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