# What is 5NF explain with example?

What is 5NF explain with example? The 5NF (Fifth Normal Form) is also known as project-join normal form. A relation is in Fifth Normal Form (5NF), if it is in 4NF, and won’t have lossless

## What is 5NF explain with example?

The 5NF (Fifth Normal Form) is also known as project-join normal form. A relation is in Fifth Normal Form (5NF), if it is in 4NF, and won’t have lossless decomposition into smaller tables. You can also consider that a relation is in 5NF, if the candidate key implies every join dependency in it.

### What is 4NF & 5NF explain with example?

A relation in 4NF must also be in BCNF(Boyce Codd Normal Form). A relation in 5NF must also be in 4NF(Fourth Normal Form). 2. A relation in 4NF must not have any multi-valued dependency….Example –

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What do you mean by 5NF?

Fifth normal form (5NF), also known as project-join normal form (PJ/NF), is a level of database normalization designed to reduce redundancy in relational databases recording multi-valued facts by isolating semantically related multiple relationships.

What is Boyce Codd Normal Form with example?

Boyce–Codd normal form (or BCNF or 3.5NF) is a normal form used in database normalization. It is a slightly stronger version of the third normal form (3NF). If a relational schema is in BCNF then all redundancy based on functional dependency has been removed, although other types of redundancy may still exist.

## Why is 5NF also called PJNF?

Fifth normal form (5NF), is also known as project-join normal form (PJNF). It is a level of database normalization designed to reduce redundancy in relational databases. A relation is said to be in 5NF if and only if it satisfies 4NF and no join dependency exists.

### What is a BCNF violation?

Let Y → A is a BCNF violation and follows from F • Then the computation of Y+ used at least one FD X → B from F. • X must be a subset of Y. • Thus, if Y is not a superkey, X cannot be a superkey either, and X → B is also a BCNF violation.

Which dependency 5NF is based on?

Fifth normal form (5NF) A relation is in 5NF if it is in 4NF and not contains any join dependency and joining should be lossless. 5NF is satisfied when all the tables are broken into as many tables as possible in order to avoid redundancy. 5NF is also known as Project-join normal form (PJ/NF).

What is the full form of PJNF?

Fifth normal form (5NF), is also known as project-join normal form (PJNF). It is a level of database normalization designed to reduce redundancy in relational databases.