title: "DROP LOGIN (Transact-SQL) | Microsoft Docs" ms.custom: "" ms.date: "05/11/2017" ms.prod: "sql" ms.prod_service: "database-engine, sql-database, sql-data-warehouse, pdw" ms.service: "" ms.component: "t-sql|statements" ms.reviewer: "" ms.suite: "sql" ms.technology:
- "database-engine" ms.tgt_pltfrm: "" ms.topic: "language-reference" f1_keywords:
- "DROP LOGIN"
- "DROP_LOGIN_TSQL" dev_langs:
- "TSQL" helpviewer_keywords:
- "deleting login accounts"
- "logins [SQL Server], removing"
- "DROP LOGIN statement"
- "removing login accounts"
- "dropping login accounts" ms.assetid: acb5c3dc-7aa2-49f6-9330-573227ba9b1a caps.latest.revision: 36 author: "edmacauley" ms.author: "edmaca" manager: "craigg" ms.workload: "On Demand" monikerRange: ">= aps-pdw-2016 || = azuresqldb-current || = azure-sqldw-latest || >= sql-server-2016 || = sqlallproducts-allversions"
[!INCLUDEtsql-appliesto-ss2008-all-md]
Removes a [!INCLUDEssNoVersion] login account.
Transact-SQL Syntax Conventions
DROP LOGIN login_name
login_name
Specifies the name of the login to be dropped.
A login cannot be dropped while it is logged in. A login that owns any securable, server-level object, or SQL Server Agent job cannot be dropped.
You can drop a login to which database users are mapped; however, this will create orphaned users. For more information, see Troubleshoot Orphaned Users (SQL Server).
In [!INCLUDEssSDS], login data required to authenticate a connection and server-level firewall rules are temporarily cached in each database. This cache is periodically refreshed. To force a refresh of the authentication cache and make sure that a database has the latest version of the logins table, execute DBCC FLUSHAUTHCACHE (Transact-SQL).
Requires ALTER ANY LOGIN permission on the server.
The following example drops the login WilliJo.
DROP LOGIN WilliJo;
GO
CREATE LOGIN (Transact-SQL)
ALTER LOGIN (Transact-SQL)
EVENTDATA (Transact-SQL)