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|object_id|**int**|ID of the object to which this column belongs.|
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|name|**sysname**|Name of the column. Is unique within the object.|
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|column_id|**int**|ID of the column. Is unique within the object.<br /><br /> Column IDs might not be sequential.|
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|system_type_id|**tinyint**|ID of the system-type of the column.|
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|user_type_id|**int**|ID of the type of the column as defined by the user.<br /><br /> To return the name of the type, join to the [sys.types](../../relational-databases/system-catalog-views/sys-types-transact-sql.md) catalog view on this column.|
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|max_length|**smallint**|Maximum length (in bytes) of the column.<br /><br /> -1 = Column data type is **varchar(max)**, **nvarchar(max)**, **varbinary(max)**, or **xml**.<br /><br /> For **text** columns, the max_length value will be 16 or the value set by sp_tableoption 'text in row'.|
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|precision|**tinyint**|Precision of the column if numeric-based; otherwise, 0.|
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|scale|**tinyint**|Scale of the column if numeric-based; otherwise, 0.|
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|collation_name|**sysname**|Name of the collation of the column if character-based; otherwise, NULL.|
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|is_nullable|**bit**|1 = Column is nullable.|
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|is_ansi_padded|**bit**|1 = Column uses ANSI_PADDING ON behavior if character, binary, or variant.<br /><br /> 0 = Column is not character, binary, or variant.|
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|is_rowguidcol|**bit**|1 = Column is a declared ROWGUIDCOL.|
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|is_identity|**bit**|1 = Column has identity values|
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|is_computed|**bit**|1 = Column is a computed column.|
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|is_filestream|**bit**|1 = Column is declared to use filestream storage.|
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|is_replicated|**bit**|1 = Column is replicated.|
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|is_non_sql_subscribed|**bit**|1 = Column has a non-[!INCLUDE[ssNoVersion](../../includes/ssnoversion-md.md)] subscriber.|
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|is_merge_published|**bit**|1 = Column is merge-published.|
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|is_dts_replicated|**bit**|1 = Column is replicated by using [!INCLUDE[ssIS](../../includes/ssis-md.md)].|
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|is_xml_document|**bit**|1 = Content is a complete XML document.<br /><br /> 0 = Content is a document fragment, or the column data type is not XML.|
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|xml_collection_id|**int**|Non-zero if the column's data type is **xml** and the XML is typed. The value will be the ID of the collection containing the column's validating XML schema namespace<br /><br /> 0 = no XML schema collection.|
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|default_object_id|**int**|ID of the default object, regardless of whether it is a stand-alone [sys.sp_bindefault](../../relational-databases/system-stored-procedures/sp-bindefault-transact-sql.md), or an in-line, column-level DEFAULT constraint. The parent_object_id column of an inline column-level default object is a reference back to the table itself.<br /><br /> 0 = No default.|
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|rule_object_id|**int**|ID of the stand-alone rule bound to the column by using sys.sp_bindrule.<br /><br /> 0 = No stand-alone rule.<br /><br /> For column-level CHECK constraints, see [sys.check_constraints (Transact-SQL)](../../relational-databases/system-catalog-views/sys-check-constraints-transact-sql.md).|
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|is_sparse|bit|1 = Column is a sparse column. For more information, see [Use Sparse Columns](../../relational-databases/tables/use-sparse-columns.md).|
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|is_column_set|bit|1 = Column is a column set. For more information, see [Use Column Sets](../../relational-databases/tables/use-column-sets.md).|
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|generated_always_type|**tinyint**|**Applies to**: [!INCLUDE[sssql16-md](../../includes/sssql16-md.md)] and later, [!INCLUDE[ssSDS_md](../../includes/sssds-md.md)]. 7, 8, 9, 10 only applies to [!INCLUDE[ssSDS_md](../../includes/sssds-md.md)].<br /><br /> Identifies when the column value is generated (will always be 0 for columns in system tables):<br /><br /> 0 = NOT_APPLICABLE<br /> 1 = AS_ROW_START<br /> 2 = AS_ROW_END<br />7 = AS_TRANSACTION_ID_START<br />8 = AS_TRANSACTION_ID_END<br />9 = AS_SEQUENCE_NUMBER_START<br />10 = AS_SEQUENCE_NUMBER_END<br /><br /> For more information, see [Temporal Tables (Relational databases)](../../relational-databases/tables/temporal-tables.md).|
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|generated_always_type_desc|**nvarchar(60)**|**Applies to**: [!INCLUDE[sssql16-md](../../includes/sssql16-md.md)] and later, [!INCLUDE[ssSDS_md](../../includes/sssds-md.md)].<br /><br /> Textual description of `generated_always_type`'s value (always NOT_APPLICABLE for columns in system tables) <br /><br /> NOT_APPLICABLE<br /> AS_ROW_START<br /> AS_ROW_END<br /><br />**Applies to**: Starting with [!INCLUDE [sssql22-md](../../includes/sssql22-md.md)], [!INCLUDE[ssSDS_md](../../includes/sssds-md.md)]<br /><br />AS_TRANSACTION_ID_START<br />AS_TRANSACTION_ID_END<br />AS_SEQUENCE_NUMBER_START<br />AS_SEQUENCE_NUMBER_END|
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|ledger_view_column_type|**tinyint**|**Applies to**: Starting with [!INCLUDE [sssql22-md](../../includes/sssql22-md.md)], [!INCLUDE[ssSDS_md](../../includes/sssds-md.md)].<br /><br /> If not NULL, indicates the type of a column in a ledger view:<br /><br /> 1 = TRANSACTION_ID<br /> 2 = SEQUENCE_NUMBER<br /> 3 = OPERATION_TYPE<br /> 4 = OPERATION_TYPE_DESC<br/><br/>For more information on database ledger, see [Ledger](/azure/azure-sql/database/ledger-overview).|
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|ledger_view_column_type_desc|**nvarchar(60)**|**Applies to**: Starting with [!INCLUDE [sssql22-md](../../includes/sssql22-md.md)], [!INCLUDE[ssSDS_md](../../includes/sssds-md.md)].<br /><br /> If not NULL, contains a textual description of the type of a column in a ledger view:<br /><br /> TRANSACTION_ID<br /> SEQUENCE_NUMBER<br /> OPERATION_TYPE<br /> OPERATION_TYPE_DESC|
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## Permissions
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[!INCLUDE[ssCatViewPerm](../../includes/sscatviewperm-md.md)] For more information, see [Metadata Visibility Configuration](../../relational-databases/security/metadata-visibility-configuration.md).
Shows the union of all columns belonging to user-defined objects and system objects.
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| Column name | Data type | Description |
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| --- | --- | --- |
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|`object_id`|**int**| ID of the object to which this column belongs. |
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|`name`|**sysname**| Name of the column. Is unique within the object. |
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|`column_id`|**int**| ID of the column. Is unique within the object.<br /><br />Column IDs might not be sequential. |
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|`system_type_id`|**tinyint**| ID of the system-type of the column. |
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|`user_type_id`|**int**| ID of the type of the column as defined by the user.<br /><br />To return the name of the type, join to the [sys.types](sys-types-transact-sql.md) catalog view on this column. |
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|`max_length`|**smallint**| Maximum length (in bytes) of the column.<br /><br />`-1` = Column data type is **varchar(max)**, **nvarchar(max)**, **varbinary(max)**, or **xml**.<br /><br />For **text** columns, the `max_length` value is `16` or the value set by `sp_tableoption 'text in row'`. |
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|`precision`|**tinyint**| Precision of the column if numeric-based; otherwise, `0`. |
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|`scale`|**tinyint**| Scale of the column if numeric-based; otherwise, `0`. |
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|`collation_name`|**sysname**| Name of the collation of the column if character-based; otherwise, `NULL`. |
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|`is_nullable`|**bit**|`1` = Column is nullable. |
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|`is_ansi_padded`|**bit**|`1` = Column uses `ANSI_PADDING ON` behavior if character, binary, or variant.<br /><br />`0` = Column isn't character, binary, or variant. |
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|`is_rowguidcol`|**bit**|`1` = Column is a declared `ROWGUIDCOL`. |
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|`is_identity`|**bit**|`1` = Column has identity values |
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|`is_computed`|**bit**|`1` = Column is a computed column. |
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|`is_filestream`|**bit**|`1` = Column is declared to use FILESTREAM storage. |
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|`is_replicated`|**bit**|`1` = Column is replicated. |
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|`is_non_sql_subscribed`|**bit**|`1` = Column has a non-[!INCLUDE [ssNoVersion](../../includes/ssnoversion-md.md)] subscriber. |
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|`is_merge_published`|**bit**|`1` = Column is merge-published. |
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|`is_dts_replicated`|**bit**|`1` = Column is replicated by using [!INCLUDE [ssIS](../../includes/ssis-md.md)]. |
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|`is_xml_document`|**bit**|`1` = Content is a complete XML document.<br /><br />`0` = Content is a document fragment, or the column data type isn't XML. |
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|`xml_collection_id`|**int**| Non-zero if the column's data type is **xml** and the XML is typed. The value is the ID of the collection containing the column's validating XML schema namespace.<br /><br />`0` = no XML schema collection. |
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|`default_object_id`|**int**| ID of the default object, regardless of whether it's a stand-alone [sys.sp_bindefault](../system-stored-procedures/sp-bindefault-transact-sql.md), or an in-line, column-level `DEFAULT` constraint. The `parent_object_id` column of an inline column-level default object is a reference back to the table itself.<br /><br />`0` = No default. |
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|`rule_object_id`|**int**| ID of the stand-alone rule bound to the column by using `sys.sp_bindrule`.<br /><br />`0` = No stand-alone rule.<br /><br />For column-level `CHECK` constraints, see [sys.check_constraints](sys-check-constraints-transact-sql.md). |
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|`is_sparse`|**bit**|`1` = Column is a sparse column. For more information, see [Use sparse columns](../tables/use-sparse-columns.md). |
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|`is_column_set`|**bit**|`1` = Column is a column set. For more information, see [Use column sets](../tables/use-column-sets.md). |
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|`generated_always_type`|**tinyint**| Identifies when the column value is generated (always `0` for columns in system tables):<br /><br />`0` = `NOT_APPLICABLE`<br />`1` = `AS_ROW_START`<br />`2` = `AS_ROW_END`<br />`7` = `AS_TRANSACTION_ID_START`<br />`8` = `AS_TRANSACTION_ID_END`<br />`9` = `AS_SEQUENCE_NUMBER_START`<br />`10` = `AS_SEQUENCE_NUMBER_END`<br /><br />For more information, see [Temporal tables](../tables/temporal-tables.md).<br /><br />**Applies to**: [!INCLUDE [sssql16-md](../../includes/sssql16-md.md)] and later versions, and [!INCLUDE [ssSDS_md](../../includes/sssds-md.md)]. `7`, `8`, `9`, `10` only applies to [!INCLUDE [ssSDS_md](../../includes/sssds-md.md)]. |
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|`generated_always_type_desc`|**nvarchar(60)**|**Applies to**: [!INCLUDE [sssql16-md](../../includes/sssql16-md.md)] and later versions, and [!INCLUDE [ssSDS_md](../../includes/sssds-md.md)].<br /><br />Textual description of the `generated_always_type` value (always `NOT_APPLICABLE` for columns in system tables)<br /><br />`NOT_APPLICABLE`<br />`AS_ROW_START`<br />`AS_ROW_END`<br /><br />**Applies to**: [!INCLUDE [sssql22-md](../../includes/sssql22-md.md)] and later versions, and [!INCLUDE [ssSDS_md](../../includes/sssds-md.md)]<br /><br />`AS_TRANSACTION_ID_START`<br />`AS_TRANSACTION_ID_END`<br />`AS_SEQUENCE_NUMBER_START`<br />`AS_SEQUENCE_NUMBER_END`|
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|`ledger_view_column_type`|**tinyint**| If not `NULL`, indicates the type of a column in a ledger view:<br /><br />`1` = `TRANSACTION_ID`<br />`2` = `SEQUENCE_NUMBER`<br />`3` = `OPERATION_TYPE`<br />`4` = `OPERATION_TYPE_DESC`<br /><br />For more information on database ledger, see [Ledger](/azure/azure-sql/database/ledger-overview).<br /><br />**Applies to**: [!INCLUDE [sssql22-md](../../includes/sssql22-md.md)] and later versions, and [!INCLUDE [ssSDS_md](../../includes/sssds-md.md)]. |
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|`ledger_view_column_type_desc`|**nvarchar(60)**| If not `NULL`, contains a textual description of the type of a column in a ledger view:<br /><br />`TRANSACTION_ID`<br />`SEQUENCE_NUMBER`<br />`OPERATION_TYPE`<br />`OPERATION_TYPE_DESC`<br /><br />**Applies to**: [!INCLUDE [sssql22-md](../../includes/sssql22-md.md)] and later versions, and [!INCLUDE [ssSDS_md](../../includes/sssds-md.md)]. |
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|`is_dropped_ledger_column`|**bit**| Indicates a ledger table column that was dropped.<br /><br />**Applies to**: [!INCLUDE [sssql22-md](../../includes/sssql22-md.md)] and later versions, and [!INCLUDE [ssSDS_md](../../includes/sssds-md.md)]|
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|`vector_dimensions`|**int**| Indicates how many dimensions the vector has.<br /><br />**Applies to**: [!INCLUDE [sssql25-md](../../includes/sssql25-md.md)] and later versions, and [!INCLUDE [ssSDS_md](../../includes/sssds-md.md)]|
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|`vector_base_type`|**tinyint**| Indicates the data type used to store vector dimensions values.<br /><br />`0` = 32-bit (single-precision) float<br />`1` = 16-bit (half-precision) float <sup>1</sup><br /><br />**Applies to**: [!INCLUDE [sssql25-md](../../includes/sssql25-md.md)] and later versions, and [!INCLUDE [ssSDS_md](../../includes/sssds-md.md)]|
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|`vector_base_type_desc`|**nvarchar(10)**| Contains the textual description of the data type used to store vector dimensions values.<br /><br />**Applies to**: [!INCLUDE [sssql25-md](../../includes/sssql25-md.md)] and later versions, and [!INCLUDE [ssSDS_md](../../includes/sssds-md.md)]|
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<sup>1</sup> For more information, see [Half-precision floating-point format](https://wikipedia.org/wiki/Half-precision_floating-point_format).
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## Permissions
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[!INCLUDE [ssCatViewPerm](../../includes/sscatviewperm-md.md)] For more information, see [Metadata visibility configuration](../security/metadata-visibility-configuration.md).
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