table relationship

["shaun" <shaun@mania.plus.com>]

Hi,

I am creating a web site which will have different types of users:
Administrators, clients and staff. Is it possible/good practice to have 3
tables related to one table i.e.


                             USER
                             user_id (PK)
                                  |
          ____________|____________
          |                       |                        |
          |                       |                        |
Administrator        Client                  Staff
admin_id(PK)       client_id(PK)       staff_id(PK)
user_id(FK)          user_id(FK)        user_id(FK)


Thanks in advance for any advice offered.



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