title: "sys.foreign_key_columns (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:
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- "sys.foreign_key_columns"
- "foreign_key_columns"
- "sys.foreign_key_columns_TSQL"
- "foreign_key_columns_TSQL" dev_langs:
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- "sys.foreign_key_columns catalog view" ms.assetid: 7247f065-5441-4bcf-9f25-c84a03290dc6 caps.latest.revision: 22 author: "edmacauley" ms.author: "edmaca" manager: "craigg" ms.workload: "Inactive" monikerRange: ">= aps-pdw-2016 || = azuresqldb-current || = azure-sqldw-latest || >= sql-server-2016 || = sqlallproducts-allversions"
[!INCLUDEtsql-appliesto-ss2008-all-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). |
[!INCLUDEssCatViewPerm] For more information, see Metadata Visibility Configuration.
Object Catalog Views (Transact-SQL)
Catalog Views (Transact-SQL)
Querying the SQL Server System Catalog FAQ