primary_key (377B)
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 It has an [arity] 6 7 - [primary_key_simple], which consists of a single [attribute] 8 - like [unary_functional_dependencies] 9 10 Up: [functional_dependency] 11 12 Aliases: key dependency, key dependencies, KDs