Question 283 of 919
DP-300 Implement a secure environment Practice Question
You are implementing row-level security (RLS) in Azure SQL Database to restrict access to sales data based on the user's Azure AD identity. Which function should you use in the security policy?
⚠ Common exam trap
Watch out — candidates often confuse USER_NAME() with SUSER_SNAME() or CURRENT_USER(), mistakenly thinking that the server-level login name or the current context user is the correct identity for row-level filtering, when in fact RLS in Azure SQL Database requires the database-level user name returned by USER_NAME().
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
✓
USER_NAME()
In Azure SQL Database, row-level security (RLS) predicates must evaluate to a Boolean value based on the current user's identity. USER_NAME() returns the database principal name derived from the Azure AD token, which is the correct function to use when filtering rows by the user's Azure AD identity. The other functions either return the login name, the session user, or the current context user, which may not reflect the actual Azure AD user in an RLS predicate.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
USER_NAME()
Why this is correct
Correct: Returns the database user name, which can be an Azure AD user.
- ✗
SESSION_USER()
Why it's wrong here
Incorrect: Returns the current session's user name.
- ✗
SUSER_SNAME()
Why it's wrong here
Incorrect: Returns the login name, not the database user.
- ✗
CURRENT_USER()
Why it's wrong here
Incorrect: Returns the current context user.
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Last reviewed: Jun 11, 2026
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