Multivalued dependency

In general, a multivalued dependency occurs when a relation R has attributes A, B, and C such thatA determines a set of values for B, A determines a set of values for C, and B and C are independent of Read More …

Partial dependency

A functional dependency that holds in a relation is partial when removing one of the determining attributes gives a functional dependency that holds in the relation.Eg if {A,B} → {C} but also {A} → {C} then {C} is partially functionally Read More …

Functional Dependency

Normalization is based on the concept of functional dependency. A functional dependency is a type of relationship between attributes.Attribute of set of attributes on the left side are called determinant and on the right are called dependentsLike R (a, b, Read More …

Inference Rules

Rules of Inference for functional dependencies, called inference axioms or Armstrong axioms, after their developer, can be used to find all the FDs logically implied by a set of FDs. These rules are sound , meaningthat they are an immediate Read More …

Normalization

Normalization transforms arbitrary relation schemes into ones without these problems. A relation with one or more of the above mentioned anomalies is split into two or more relations of a higher normal form.Normal Forms Normalization is basically; a process of Read More …