title: "sys.foreign_keys (Transact-SQL) | Microsoft Docs" ms.custom: "" ms.date: "03/15/2017" ms.prod: "sql" ms.prod_service: "database-engine, sql-database, sql-data-warehouse, pdw" ms.service: "" ms.component: "system-catalog-views" ms.reviewer: "" ms.suite: "sql" ms.technology:
- "database-engine" ms.tgt_pltfrm: "" ms.topic: "language-reference" f1_keywords:
- "foreign_keys"
- "sys.foreign_keys"
- "sys.foreign_keys_TSQL"
- "foreign_keys_TSQL" dev_langs:
- "TSQL" helpviewer_keywords:
- "sys.foreign_keys catalog view" ms.assetid: e960df1a-13fc-43ee-ba91-34c1b719ac2c caps.latest.revision: 37 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]
Contains a row per object that is a FOREIGN KEY constraint, with sys.object.type = F.
| Column name | Data type | Description |
|---|---|---|
| <Columns inherited from sys.objects> | For a list of columns that this view inherits, see sys.objects (Transact-SQL). | |
| referenced_object_id | int | ID of the referenced object. |
| key_index_id | int | ID of the key index within the referenced object. |
| is_disabled | bit | FOREIGN KEY constraint is disabled. |
| is_not_for_replication | bit | FOREIGN KEY constraint was created by using the NOT FOR REPLICATION option. |
| is_not_trusted | bit | FOREIGN KEY constraint has not been verified by the system. |
| delete_referential_action | tinyint | The referential action that was declared for this FOREIGN KEY when a delete happens. 0 = No action 1 = Cascade 2 = Set null 3 = Set default |
| delete_referential_action_desc | nvarchar(60) | Description of the referential action that was declared for this FOREIGN KEY when a delete occurs: NO_ACTION CASCADE SET_NULL SET_DEFAULT |
| update_referential_action | tinyint | The referential action that was declared for this FOREIGN KEY when an update happens. 0 = No action 1 = Cascade 2 = Set null 3 = Set default |
| update_referential_action_desc | nvarchar(60) | Description of the referential action that was declared for this FOREIGN KEY when an update happens: NO_ACTION CASCADE SET_NULL SET_DEFAULT |
| is_system_named | bit | 1 = Name was generated by the system. 0 = Name was supplied by the user. |
[!INCLUDEssCatViewPerm] For more information, see Metadata Visibility Configuration.
Catalog Views (Transact-SQL)
Object Catalog Views (Transact-SQL)
Querying the SQL Server System Catalog FAQ