Subject RE: [ib-support] Re: time series and FB/IB
Author Louis Kleiman
Typically, I don't use a generated key if the combination is unique.


-----Original Message-----
From: Ray Drew [mailto:ray_drew@...]
Sent: Tuesday, December 10, 2002 10:04 AM
Subject: Re: [ib-support] Re: time series and FB/IB

Louis wrote:
I use a generated key in a many-to-many situation when there is a
possibility of duplication. If Bob has more that one shirt in his
closet, you might want an entry for each in the Wardrobe table. If you
key on Person and Clothes, this would generate a key violation.

Accepted - if person/clothes is not unique it can't be a PK.

What's the argument for a generated key if person/clothes is unique?


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