Here is a good article on the topic:
http://www.devx.com/ibm/Article/20702
The surrogate key isn't solving the underlying logical inconsistency problem. It is being used as a work-around to cover one up. I suspect the author of being a MySQL user.
Actually he is a software project consultant for IEEE.org and he holds a Ph.D. in Theoretical Physics.
Sincerely,
Joshua D. Drake
Mike Mascari
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