Inheritance question

Hi folks, I've got a question regarding inheritance.

What are the advantages of using inheritance in the database
structure as opposed to using foreign keys? Doesn't
interitance mean that there will be much more duplication
of data in the database?

If anyone has any examples of proper usage of inheritance,
please let met know. I've read the docs, and haven't
puzzled out the usefulness of inheritance.

Thanks,

--
Mark Steele
Vice president research and development
Inet Technologies Inc.
msteele@inet-interactif.com

010110010110111101110101001000000110000101110010011001010010000001100100011101010110110101100010