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title: "sys.foreign_key_columns (Transact-SQL) | Microsoft Docs"
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# sys.foreign_key_columns (Transact-SQL)
[!INCLUDE[tsql-appliesto-ss2008-all_md](../../includes/tsql-appliesto-ss2008-all-md.md)]

  Contains a row for each column, or set of columns, that comprise a foreign key.  
  
|Column name|Data type|Description|  
|-----------------|---------------|-----------------|  
|**constraint_object_id**|**int**|ID of the FOREIGN KEY constraint.|  
|**constraint_column_id**|**int**|ID of the column, or set of columns, that comprise the FOREIGN KEY (*1..n* where n=number of columns).|  
|**parent_object_id**|**int**|ID of the parent of the constraint, which is the referencing object.|  
|**parent_column_id**|**int**|ID of the parent column, which is the referencing column.|  
|**referenced_object_id**|**int**|ID of the referenced object, which has the candidate key.|  
|**referenced_column_id**|**int**|ID of the referenced column (candidate key column).|  
  
## Permissions  
 [!INCLUDE[ssCatViewPerm](../../includes/sscatviewperm-md.md)] For more information, see [Metadata Visibility Configuration](../../relational-databases/security/metadata-visibility-configuration.md).  
  
## See Also  
 [Object Catalog Views (Transact-SQL)](../../relational-databases/system-catalog-views/object-catalog-views-transact-sql.md)   
 [Catalog Views (Transact-SQL)](../../relational-databases/system-catalog-views/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)