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title: "sys.foreign_keys (Transact-SQL) | Microsoft Docs"
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# sys.foreign_keys (Transact-SQL)
[!INCLUDE[tsql-appliesto-ss2008-all_md](../../includes/tsql-appliesto-ss2008-all-md.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 &#40;Transact-SQL&#41;](../../relational-databases/system-catalog-views/sys-objects-transact-sql.md).|  
|**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.<br /><br /> 0 = No action<br /><br /> 1 = Cascade<br /><br /> 2 = Set null<br /><br /> 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:<br /><br /> NO_ACTION<br /><br /> CASCADE<br /><br /> SET_NULL<br /><br /> SET_DEFAULT|  
|**update_referential_action**|**tinyint**|The referential action that was declared for this FOREIGN KEY when an update happens.<br /><br /> 0 = No action<br /><br /> 1 = Cascade<br /><br /> 2 = Set null<br /><br /> 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:<br /><br /> NO_ACTION<br /><br /> CASCADE<br /><br /> SET_NULL<br /><br /> SET_DEFAULT|  
|**is_system_named**|**bit**|1 = Name was generated by the system.<br /><br /> 0 = Name was supplied by the user.|  
  
## Permissions  
 [!INCLUDE[ssCatViewPerm](../../includes/sscatviewperm-md.md)] For more information, see [Metadata Visibility Configuration](../../relational-databases/security/metadata-visibility-configuration.md).  
  
## See Also  
 [Catalog Views &#40;Transact-SQL&#41;](../../relational-databases/system-catalog-views/catalog-views-transact-sql.md)   
 [Object Catalog Views &#40;Transact-SQL&#41;](../../relational-databases/system-catalog-views/object-catalog-views-transact-sql.md)   
 [Querying the SQL Server System Catalog FAQ](../../relational-databases/system-catalog-views/querying-the-sql-server-system-catalog-faq.md)