---
title: "sys.default_constraints (Transact-SQL)"
description: sys.default_constraints (Transact-SQL)
author: VanMSFT
ms.author: vanto
ms.date: "03/15/2017"
ms.prod: sql
ms.prod_service: "database-engine, sql-database, synapse-analytics, pdw"
ms.technology: system-objects
ms.topic: "reference"
f1_keywords:
  - "sys.default_constraints"
  - "sys.default_constraints_TSQL"
  - "default_constraints"
  - "default_constraints_TSQL"
helpviewer_keywords:
  - "sys.default_constraints catalog view"
dev_langs:
  - "TSQL"
ms.assetid: 096e3659-edeb-4440-a016-f847acd6166b
monikerRange: ">=aps-pdw-2016||=azuresqldb-current||=azure-sqldw-latest||>=sql-server-2016||>=sql-server-linux-2017||=azuresqldb-mi-current"
---
# sys.default_constraints (Transact-SQL)
[!INCLUDE [sql-asdb-asdbmi-asa-pdw](../../includes/applies-to-version/sql-asdb-asdbmi-asa-pdw.md)]

  Contains a row for each object that is a default definition (created as part of a CREATE TABLE or ALTER TABLE statement instead of a CREATE DEFAULT statement), with **sys.objects.type** = D.  
  
|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).|  
|**parent_column_id**|**int**|ID of the column in **parent_object_id** to which this default belongs.|  
|**definition**|**nvarchar(max)**|SQL expression that defines this default.|  
|**is_system_named**|**bit**|1 = Name was generated by 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).  
  
## Examples  
 The following example returns the definition of the DEFAULT constraint that is applied to the `VacationHours` column of the `HumanResources.Employee` table.  
  
```  
USE AdventureWorks2012;  
GO  
SELECT d.definition   
FROM sys.default_constraints AS d  
INNER JOIN sys.columns AS c  
ON d.parent_object_id = c.object_id
AND d.parent_column_id = c.column_id  
WHERE d.parent_object_id = OBJECT_ID(N'HumanResources.Employee', N'U')  
AND c.name = 'VacationHours';  
```  
  
## See Also  
 [Object Catalog Views &#40;Transact-SQL&#41;](../../relational-databases/system-catalog-views/object-catalog-views-transact-sql.md)   
 [Catalog Views &#40;Transact-SQL&#41;](../../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.yml)