Column Element for Index (DTA)

Článek
06/13/2017

Specifies the columns on which the index is created for a user-specified configuration.

Syntax

  
<Create>  
  <Index>  
    <Name>...</Name>  
    <Column [Type | SortOrder]>  
     ...code removed here...  
     </Column>

Element Attributes

Column Attribute Description

Type Optional. Specifies the index column type. Use a string data type to specify this attribute with one of the following allowed values:

KeyColumn:
Specifies that the column is referenced by an index key. Use the following syntax to set this attribute:
<Column Type="KeyColumn">
For more information about key columns, see Clustered and Nonclustered Indexes Described.

IncludedColumn: Specifies that the column is an included column (instead of a key column). Use the following syntax to set this attribute:
<Column Type="IncludedColumn">
For more information about included columns, see Create Indexes with Included Columns.

SortOrder Optional. Specifies the sorting order of the column. Use a string data type to specify either an "Ascending" or "Descending" sorting order as follows:

<Column SortOrder="Ascending">

Column Attribute	Description
`Type`	Optional. Specifies the index column type. Use a string data type to specify this attribute with one of the following allowed values: `KeyColumn`: Specifies that the column is referenced by an index key. Use the following syntax to set this attribute: `<Column Type="KeyColumn">` For more information about key columns, see Clustered and Nonclustered Indexes Described. `IncludedColumn`: Specifies that the column is an included column (instead of a key column). Use the following syntax to set this attribute: `<Column Type="IncludedColumn">` For more information about included columns, see Create Indexes with Included Columns.
`SortOrder`	Optional. Specifies the sorting order of the column. Use a string data type to specify either an "Ascending" or "Descending" sorting order as follows: `<Column SortOrder="Ascending">`

Element Characteristics

Characteristic	Description
Data type and length	None.
Default value	None.
Occurrence	Can specify up to 1024 columns for the `Index` element.

Element Relationships

Relationship	Elements
Parent element	Index Element (DTA)
Child elements	Name Element for Column (DTA)

Example

For a usage example of this element, see the XML Input File Sample with User-specified Configuration (DTA).

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