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