In the File system, one representative will represent his/her own department very conservatively, since one individual will know the structure of the system. There is no way you can generate an automated-scheme or a process a data about an employee who is a customer can be linked up with common procedure accessed by all the point-of-sales units.
|Forefront of DBMS
|RDBMS : the relational model was first developed by E.F. Codd (of IBM)
A common Table will contain necessary links known as Primacy and Foreign key , that will allow the users the retrieve the data from the linked or allied tables.
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