functional dependency การใช้

• Functional dependencies however should not be confused with tuple-generating dependencies.
• Recall that transitive functional dependencies of non-prime attributes on candidate keys.
• Type families are regarded as being generally easier to type-check than functional dependencies.
• This case represents an example where multiple functional dependencies are embedded in a single representation of data.
• For example, if that functional dependency occurs as a result of the transitive functional dependencies VIN ?
• For example, if that functional dependency occurs as a result of the transitive functional dependencies VIN ?
• It is in fact the base-point x _ 0 from which jets derive their functional dependency.
• Simon Peyton-Jones has objected to the introduction of functional dependencies in Haskell on grounds of complexity.
• We denote by F ^ { + } the set of all functional dependencies that are logically implied by F.
• The main advantages of functional dependencies over type families are in their added flexibility in handling a few unusual cases.
• His professional contributions spanned subjects as diverse as Functional dependency, object histories, spreadsheet histories, Datalog, and data restructuring.
• The determination of functional dependencies is an important part of designing databases in the relational model, and in database normalization and denormalization.
• In contrast to the functional dependency, the "'multivalued dependency "'requires that certain tuples be present in a relation.
• The notion of logical implication for functional dependencies admits a complete finite axiomatization, known as "'Armstrong's axioms " '.
• This functional dependency may suggest that the attribute EngineCapacity be placed in a relation with candidate key VIN . However, that may not always be appropriate.
• We denote by F ^ { * } _ { A } the set of all functional dependencies that are derivable from F by inference rules in A.
• In other words, its candidate keys do not guarantee that the functional dependency { Person, Shop Type } ?! { Shop } will be respected.
• In its simplest application the chase is used for testing whether the relation and " F " is a set of functional dependencies ( FD ).
• Unlike in the case of functional dependencies, there is no complete axiomatization for join dependencies, though axiomatization exist for more expressive dependency languages such as full typed dependencies.
• A superkey is a property of a relation variable which must hold for all possible values and can only be determined from the functional dependencies which apply to that relation variable.