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primary_key (310B)


      1 # Primary key
      2 
      3 A set of [attributes] which [functionally_determines] all other [attributes]. It can be expressed as [functional_dependencies], and it is a special case of them
      4 
      5 - [primary_key_simple], which consists of a single [attribute]
      6   - like [unary_functional_dependencies]
      7 
      8 Up: [functional_dependency]