index_name is the name of the index file. For FoxPro and dBASE IV or V, this is a tag, which is required to identify the indexes in an index file. Each index for a table must have a unique name.
base_table_name is the name of the database file whose index is to be created. The .DBF extension is not required; the driver automatically adds it if it is not present. By default, dBASE IV or V index files are named
base_table_name.MDX and FoxPro indexes are named
base_table_name.CDX.
field_name is a name of a column in the dBASE table. You can substitute a valid dBASE-style index expression for the list of field names.