When using the 
bcp command, you can specify multiple partitions and data
                files. Use commas to separate each partition name or data file. 
- With bcp out, multiple files are used only with
                        partitions in a one-to-one relationship.
- With bcp in, multiple files can be used with or without
                        partitions. If you use them without partitions, input data files are read in
                        order of their listing in the command line arguments.