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title: "sys.assemblies (Transact-SQL) | Microsoft Docs"
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# sys.assemblies (Transact-SQL)
[!INCLUDE[tsql-appliesto-ss2008-xxxx-asdw-pdw_md](../../includes/tsql-appliesto-ss2008-xxxx-asdw-pdw-md.md)]

  Returns a row for each assembly.  
  
|Column name|Data type|Description|  
|-----------------|---------------|-----------------|  
|**name**|**sysname**|Name of the assembly. Is unique within the database.|  
|**principal_id**|**int**|ID of the principal that owns this assembly.|  
|**assembly_id**|**int**|Assembly identification number. Is unique within a database.|  
|**clr_name**|**nvarchar(4000)**|Canonical string that encodes the simple name, version number, culture, public key, and architecture of the assembly. This value uniquely identifies the assembly on the common language runtime (CLR) side.|  
|**permission_set**|**tinyint**|Permission-set/security-level for assembly.<br /><br /> 1 = Safe Access<br /><br /> 2 = External Access<br /><br /> 3 = Unsafe Access|  
|**permission_set_desc**|**nvarchar(60)**|Description for permission-set/security-level for assembly.<br /><br /> SAFE_ACCESS<br /><br /> EXTERNAL_ACCESS<br /><br /> UNSAFE_ACCESS|  
|**is_visible**|**bit**|1 = Assembly is visible to register [!INCLUDE[tsql](../../includes/tsql-md.md)] entry points.<br /><br /> 0 = Assembly is intended only for managed callers. That is, the assembly provides internal implementation for other assemblies in the database.|  
|**create_date**|**datetime**|Date the assembly was created or registered.|  
|**modify_date**|**datetime**|Date the assembly was modified.|  
|**is_user_defined**|**bit**|Indicates the source of the assembly.<br /><br /> 0 = System-defined assemblies (such as Microsoft.SqlServer.Types for the **hierarchyid** data type)<br /><br /> 1 = User-defined assemblies|  
  
## Permissions  
 [!INCLUDE[ssCatViewPerm](../../includes/sscatviewperm-md.md)] For more information, see [Metadata Visibility Configuration](../../relational-databases/security/metadata-visibility-configuration.md).  
  
## See Also  
 [CLR Assembly Catalog Views &#40;Transact-SQL&#41;](../../relational-databases/system-catalog-views/clr-assembly-catalog-views-transact-sql.md)   
 [Catalog Views &#40;Transact-SQL&#41;](../../relational-databases/system-catalog-views/catalog-views-transact-sql.md)   
 [ASSEMBLYPROPERTY &#40;Transact-SQL&#41;](../../t-sql/functions/assemblyproperty-transact-sql.md)