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 …

# Category: management system

## Completely non-trivial:

If an FD X → Y holds, where x intersect Y = Φ, it is said to be a completely non-trivial FD.

## Non-Trivial Functional Dependency

Non-trivial − If an FD X → Y holds, where Y is not a subset of X, then it is called a non-trivial FD.

## Trivial Functional Dependency

Trivial − If a functional dependency (FD) X → Y holds, where Y is a subset of X, then it is called a trivial FD.

## 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 …