Returns the name of a column from a specified corresponding table identification number and column identification number.
COL_NAME ( table_id , column_id )
Is the identification number of the table that contains the column. table_id is of type int.
Is the identification number of the column. column_id parameter is of type int.
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 COL_NAME may return NULL if the user does not have any permission on the object. For more information, see Metadata Visibility Configuration.
The table_id and column_id parameters together produce a column name string.
For more information about obtaining table and column identification numbers, see OBJECT_ID (Transact-SQL).
The following example returns the name of the first column in the Employee table of the AdventureWorks2012 database.
USE AdventureWorks2012; GO SET NOCOUNT OFF; GO SELECT COL_NAME(OBJECT_ID('HumanResources.Employee'), 1) AS 'Column Name'; GO
Here is the result set.