suser-name-transact-sql.md

title	SUSER_NAME (Transact-SQL) | Microsoft Docs
ms.custom
ms.date	03/14/2017
ms.prod	sql
ms.prod_service	sql-data-warehouse, sql-database
ms.reviewer
ms.technology	t-sql
ms.topic	language-reference
f1_keywords	SUSER_NAME SUSER_NAME_TSQL
dev_langs	TSQL
helpviewer_keywords	security identification names [SQL Server] logins [SQL Server], users identification names for logins [SQL Server] users [SQL Server], logins SUSER_NAME function logins [SQL Server], names names [SQL Server], logins
ms.assetid	ae598d9f-9baa-49b8-b1c1-042854206de4
author	VanMSFT
ms.author	vanto
monikerRange	=azure-sqldw-latest||>=sql-server-2016||=sqlallproducts-allversions||>=sql-server-linux-2017||=azuresqldb-mi-current

SUSER_NAME (Transact-SQL)

[!INCLUDEtsql-appliesto-ss2008-xxxx-asdw-xxx-md]

Returns the login identification name of the user.

Transact-SQL Syntax Conventions

Syntax

  
SUSER_NAME ( [ server_user_id ] )   

Arguments

server_user_id
Is the login identification number of the user. server_user_id, which is optional, is int. server_user_id can be the login identification number of any [!INCLUDEssNoVersion] login or [!INCLUDEmsCoName] Windows user or group that has permission to connect to an instance of [!INCLUDEssNoVersion]. When server_user_id isn't specified, the login identification name for the current user is returned. If the parameter contains the word NULL, it will return NULL.

Return Types

nvarchar(128)

Remarks

In [!INCLUDEssNoVersion] version 7.0, the security identification number (SID) replaced the server user identification number (SUID).

SUSER_NAME returns a login name only for a login that has an entry in the syslogins system table.

SUSER_NAME can be used in a select list, in a WHERE clause, and anywhere an expression is allowed. Use parentheses after SUSER_NAME, even if no parameter is specified.

Examples

The following example returns the login identification name of the user with a login identification number of 1.

SELECT SUSER_NAME(1);  

See Also

SUSER_ID (Transact-SQL)
Principals (Database Engine)