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INDEX_COL (Transact-SQL)

Returns the indexed column name. Returns NULL for XML indexes.

Topic link iconTransact-SQL Syntax Conventions

Syntax

INDEX_COL ('[ database_name . [ schema_name ] .| schema_name ]
    table_or_view_name',index_id,key_id)

Arguments

  • database_name
    Is the name of the database.

  • schema_name
    Is the name of the schema to which the index belongs.

  • table_or_view_name
    Is the name of the table or indexed view. table_or_view_name must be delimited by single quotation marks and can be fully qualified by database name and schema name.

  • index_id
    Is the ID of the index. index_ID is int.

  • key_id
    Is the index key column position. key_ID is int.

Return Types

nvarchar (128)

Exceptions

Returns NULL on error or if a caller does not have permission to view the object.

A user can only view the metadata of securables that the user owns or on which the user has been granted permission. This means that metadata-emitting, built-in functions such as INDEX_COL may return NULL if the user does not have any permission on the object. For more information, see Metadata Visibility Configuration and Troubleshooting Metadata Visibility.

Examples

A. Using INDEX_COL to return an index column name

The following example returns the column names of the two key columns in the index PK_SalesOrderDetail_SalesOrderID_LineNumber.

USE AdventureWorks2008R2;
GO
SELECT 
    INDEX_COL (N'AdventureWorks2008R2.Sales.SalesOrderDetail', 1,1) AS
        [Index Column 1], 
    INDEX_COL (N'AdventureWorks2008R2.Sales.SalesOrderDetail', 1,2) AS
        [Index Column 2]
;
GO

Here is the result set:

Index Column 1      Index Column 2
-----------------------------------------------
SalesOrderID        SalesOrderDetailID