Returns the file identification (ID) number for the given logical file name in the current database.
This feature will be removed in a future version of Microsoft SQL Server. Avoid using this feature in new development work, and plan to modify applications that currently use this feature. Use FILE_IDEX instead.
FILE_ID ( file_name )
Is an expression of type sysname that represents the name of the file for which to return the file ID.
file_name corresponds to the logical file name displayed in the name column in the sys.master_files or sys.database_files catalog views.
In SQL Server, the file identification number assigned to full-text catalogs is greater than 32767. Because the return type of the FILE_ID function is smallint, this function cannot be used for full-text files. Use FILE_IDEX instead.
The following example returns the file ID for the AdventureWorks_Data file.
USE AdventureWorks2012; GO SELECT FILE_ID('AdventureWorks2012_Data')AS 'File ID'; GO
Here is the result set.
File ID ------- 1 (1 row(s) affected)