Returns the login name associated with a security identification number (SID).
Transact-SQL Syntax Conventions
SUSER_SNAME ( [ server_user_sid ] )
server_user_sid
Applies to: SQL Server 2008 through SQL Server 2008 SQL Server 2017
Is the optional login security identification number. server_user_sid is varbinary(85). server_user_sid can be the security identification number of any SQL Server login or SQL Server Microsoft Windows user or group. If server_user_sid is not specified, information about the current user is returned. If the parameter contains the word NULL will return NULL.
nvarchar(128)
SUSER_SNAME can be used as a DEFAULT constraint in either ALTER TABLE or CREATE TABLE. SUSER_SNAME can be used in a select list, in a WHERE clause, and anywhere an expression is allowed. SUSER_SNAME must always be followed by parentheses, even if no parameter is specified.
When called without an argument, SUSER_SNAME returns the name of the current security context. When called without an argument within a batch that has switched context by using EXECUTE AS, SUSER_SNAME returns the name of the impersonated context. When called from an impersonated context, ORIGINAL_LOGIN returns the name of the original context.
SUSER_NAME always return the login name for the current security context.
The SUSER_SNAME statement does not support execution using an impersonated security context through EXECUTE AS.
The following example returns the login name for the current security context.
SELECT SUSER_SNAME();
GO
The following example returns the login name associated with a Windows security identification number.
Applies to: SQL Server 2008 through SQL Server 2008 SQL Server 2017
SELECT SUSER_SNAME(0x010500000000000515000000a065cf7e784b9b5fe77c87705a2e0000);
GO
The following example uses SUSER_SNAME
as a DEFAULT
constraint in a CREATE TABLE
statement.
USE AdventureWorks2012;
GO
CREATE TABLE sname_example
(
login_sname sysname DEFAULT SUSER_SNAME(),
employee_id uniqueidentifier DEFAULT NEWID(),
login_date datetime DEFAULT GETDATE()
);
GO
INSERT sname_example DEFAULT VALUES;
GO
This example shows the behavior of SUSER_SNAME when called from an impersonated context.
Applies to: SQL Server 2008 through SQL Server 2008 SQL Server 2017
SELECT SUSER_SNAME();
GO
EXECUTE AS LOGIN = 'WanidaBenShoof';
SELECT SUSER_SNAME();
REVERT;
GO
SELECT SUSER_SNAME();
GO
Here is the result.
sa
WanidaBenShoof
sa
The following example returns the login name for the security identification number with a value of 0x01
.
SELECT SUSER_SNAME(0x01);
GO
The following example returns the login name of the current login.
SELECT SUSER_SNAME() AS CurrentLogin;
GO
SUSER_SID (Transact-SQL)
Principals (Database Engine)
sys.server_principals (Transact-SQL)
EXECUTE AS (Transact-SQL)