Quick Answer
Dynamic Data Masking is the correct choice because it allows you to mask column with dynamic data masking rules that obfuscate sensitive data in query results without altering the underlying database. By defining a mask function on the credit card column—such as exposing only the last four digits—you restrict full visibility to users lacking the UNMASK permission, while granting that permission to the 'CreditCardViewer' role reveals the complete value. On the Microsoft Azure Database Administrator Associate DP-300 exam, this scenario tests your ability to distinguish between Dynamic Data Masking and other security features like Always Encrypted or Row-Level Security; a common trap is confusing masking (which hides data at query time) with encryption (which protects data at rest). Remember the key distinction: masking is a presentation-layer control, not a cryptographic one. For a quick memory tip, think “Mask the view, not the data”—DDM changes what users see, not what is stored.
This DP-300 practice question tests your understanding of implement a secure environment. 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.
Your company uses Azure SQL Database and needs to restrict access to a specific column containing credit card numbers. Only users with the 'CreditCardViewer' role should see the full number; others should see only the last four digits. Which feature should you implement?
Always Encrypted
Why wrong: Encrypts data at rest and in use, but does not provide partial masking.
Row-Level Security
Why wrong: Controls access to rows, not columns.
Column-level security with GRANT
Why wrong: Can deny access to a column, but cannot show partial data.
Dynamic Data Masking
Masks sensitive data in query results for unauthorized users.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Dynamic Data Masking
Dynamic Data Masking (DDM) is the correct choice because it allows you to obfuscate sensitive data in query results without changing the underlying database. You can define a mask on the credit card column that shows only the last four digits to users without the 'CreditCardViewer' role, while users with that role can be granted the UNMASK permission to see the full value.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Always Encrypted
Why it's wrong here
Encrypts data at rest and in use, but does not provide partial masking.
Row-Level Security
Why it's wrong here
Controls access to rows, not columns.
Column-level security with GRANT
Why it's wrong here
Can deny access to a column, but cannot show partial data.
Dynamic Data Masking
Why this is correct
Masks sensitive data in query results for unauthorized users.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
The trap here is that candidates often confuse Dynamic Data Masking with Column-Level Security (GRANT), not realizing that GRANT cannot partially reveal data—it only provides all-or-nothing column access, whereas DDM is designed specifically for partial obfuscation based on permissions.
Trap categories for this question
Command / output trap
Can deny access to a column, but cannot show partial data.
Detailed technical explanation
Dynamic Data Masking works by applying a masking function (e.g., partial() for credit cards) to a column definition in the schema. The UNMASK permission is a database-level permission that overrides all masks for the grantee, and it can be granted to roles like 'CreditCardViewer'. A subtle behavior is that masking is applied at query result time, so users without UNMASK can still perform operations like JOINs or filtering on the masked column, but the masked value is used in those operations, which can lead to unexpected results if not carefully designed.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
What to study next
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FAQ
Implement a secure environment — This question tests Implement a secure environment — Read the scenario before looking for a memorised answer..
The correct answer is: Dynamic Data Masking — Dynamic Data Masking (DDM) is the correct choice because it allows you to obfuscate sensitive data in query results without changing the underlying database. You can define a mask on the credit card column that shows only the last four digits to users without the 'CreditCardViewer' role, while users with that role can be granted the UNMASK permission to see the full value.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 24, 2026
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