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Re: They do respect set theory! (and violate 3NF)

by Ovid (Cardinal)
on Dec 11, 2005 at 19:36 UTC ( [id://515890]=note: print w/replies, xml ) Need Help??

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  1. or download this
    +------------------+
    | Supplier_Product |
    +------------------+
    ...
    | S1      | P1     |
    | S1      | P2     |
    +------------------+
    
  2. or download this
    +-----------------+
    | City  | Country |
    +-------+---------+
    ...
    | Paris | France  |
    | Paris | USA     |
    +-----------------+
    
  3. or download this
    +----------------------+
    | ID | City  | Country |
    +----+-------+---------+
    ...
    | 02 | Paris | France  |
    | 03 | Paris | USA     |
    +----------------------+
    

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