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 Posted by Anith Sen on 03/14/06 00:54 
Erland, 
 
Can you post your definition of a "natural key"? 
 
>> And this is just one example where the real world does not have that fine  
>> key the relational model wants. 
 
However, real world examples of entities, by virtue of there mere existance,  
have keys regardless of what relational model mandates. 
 
>> Again, think customers. 
 
What about them? 
 
--  
Anith
 
  
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