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 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?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
It is stored in rows and columns with a predefined schema.
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.
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.
✓
It is stored in rows and columns with a predefined schema.
Why this is correct
Structured data is characterized by a rigid schema and tabular format, enabling relational database features like ACID transactions.
Related concept
Read the scenario before looking for a memorised answer.
✗
It is stored as key-value pairs.
Why it's wrong here
Key-value pairs are a type of NoSQL data model, not the defining characteristic of structured (relational) data.
✗
It is stored in JSON format with variable fields.
Why it's wrong here
JSON with variable fields describes semi-structured data, not structured data.
✗
It is stored in unstructured text files.
Why it's wrong here
Unstructured text files lack a predefined schema, unlike structured data.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse 'structured' with any organized storage format (like JSON or key-value pairs), but the DP-900 exam specifically defines structured data as having a fixed schema with rows and columns in a relational database.
Detailed technical explanation
How to think about this question
Structured data relies on a schema-on-write approach, where the table definition (e.g., CREATE TABLE Orders) is enforced at insertion time, ensuring data types and constraints (e.g., PRIMARY KEY, NOT NULL) are validated. Under the hood, relational database engines like SQL Server or PostgreSQL use B-tree indexes and ACID transactions to guarantee consistency for OLTP workloads such as order processing. A real-world scenario: if the schema defines 'quantity' as INT, any attempt to insert a non-integer value is rejected, preserving data integrity for inventory calculations.
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: It is stored in rows and columns with a predefined schema. — 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.
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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