USER_NAME (Transact-SQL)
Returns a database user name from a specified identification number.
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Syntax
USER_NAME ( [ id ] )
Arguments
- id
Is the identification number associated with a database user. idis int. The parentheses are required.
Return Types
nvarchar(256)
Remarks
When id is omitted, the current user in the current context is assumed. If contains the word NULL, will return NULL. When USER_NAME is called without specifying an id after an EXECUTE AS statement, USER_NAME returns the name of the impersonated user. If a Windows principal accesses the database by way of membership in a group, USER_NAME returns the name of the Windows principal instead of the group.
Examples
A. Using USER_NAME
The following example returns the user name for user ID 13.
SELECT USER_NAME(13);
GO
B. Using USER_NAME without an ID
The following example finds the name of the current user without specifying an ID.
SELECT USER_NAME();
GO
Here is the result set for a user that is a member of the sysadmin fixed server role.
------------------------------
dbo
(1 row(s) affected)
C. Using USER_NAME in the WHERE clause
The following example finds the row in sysusers in which the name is equal to the result of applying the system function USER_NAME to user identification number 1.
SELECT name FROM sysusers WHERE name = USER_NAME(1);
GO
Here is the result set.
name
------------------------------
dbo
(1 row(s) affected)
D. Calling USER_NAME during impersonation with EXECUTE AS
The following example shows how USER_NAME behaves during impersonation.
SELECT USER_NAME();
GO
EXECUTE AS USER = 'Zelig';
GO
SELECT USER_NAME();
GO
REVERT;
GO
SELECT USER_NAME();
GO
Here is the result set.
DBO
Zelig
DBO