# What is difference between BCNF and 3NF?

## What is difference between BCNF and 3NF?

This relation is in 3NF as it is already in 2NF and has no transitive dependency. Also there is no non prime attribute that is deriving a non prime attribute….Difference between 3NF and BCNF :

S.NO. 3NF BCNF
3. In 3NF the functional dependencies are already in 1NF and 2NF. In BCNF the functional dependencies are already in 1NF, 2NF and 3NF.

## Is a relation in 3NF also in BCNF?

Every relation in BCNF is also in 3NF, but the reverse is not necessarily true. 3NF allows attributes to be part of a candidate key that is not the primary key; BCNF does not. This means that relations in 3NF are often in BCNF, but not always.

What is the difference between 3NF and 4NF?

Any relation is said to be in the fourth normal form when it satisfies the following conditions : It must be in Boyce Codd Normal Form (BCNF). It should have no multi-valued dependency….Difference between BCNF and 4NF :

S.No. BCNF 4NF
1 A relation in BCNF must also be in 3NF. A relation in 4NF must also be in Boyce Codd Normal Form (BCNF).

### Why BCNF is stricter than 3NF in Rdbms?

BCNF is stricter than 3NF because each and every BCNF is relation to 3NF but every 3NF is not relation to BCNF. BCNF non-transitionally depends on individual candidate key but there is no such requirement in 3NF. 5. Hence BCNF is stricter than 3NF.

### What is 3NF example?

A relation that is in First and Second Normal Form and in which no non-primary-key attribute is transitively dependent on the primary key, then it is in Third Normal Form (3NF). Note – If A->B and B->C are two FDs then A->C is called transitive dependency.

Which one is stronger BCNF or 3NF?

BCNF is a stronger form of normalization than 3NF because it eliminates the second condition for 3NF, which allowed the right side of the FD to be a prime attribute. Thus, every left side of an FD in a table must be a superkey. Every table that is BCNF is also 3NF, 2NF, and 1NF, by the previous definitions.

#### Which is true for BCNF?

Correct answer is (C) Every relation in BCNF is also in 3NF.

#### What is the full form of BCNF?

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). BCNF was developed in 1974 by Raymond F.

What is 3NF 4NF BCNF?

3NF (Third Normal Form) BCNF (Boyce-Codd Normal Form) 4NF (Fourth Normal Form) 5NF (Fifth Normal Form) 6NF (Sixth Normal Form)

## Which is stronger BCNF or 3NF?

BCNF is a stronger form of normalization than 3NF because it eliminates the second condition for 3NF, which allowed the right side of the FD to be a prime attribute. Thus, every left side of an FD in a table must be a superkey.

## What is 3NF?

Third normal form (3NF) is a database schema design approach for relational databases which uses normalizing principles to reduce the duplication of data, avoid data anomalies, ensure referential integrity, and simplify data management. It was defined in 1971 by Edgar F.

What’s the difference between 3NF and BCNF in relation?

The basic difference between 3NF and BCNF is that 3NF eliminates the transitive dependency from a relation and a table to be in BCNF, the trivial functional dependency X->Y in a relation must hold, only if X is the super key. Let us discuss the differences between 3NF and BCNF with the help of comparison chart shown below.

### Which is stronger BCNF or 3NF for decomposition?

It can be used to achieve lossless decomposition. For any relation A->B, ‘A’ should be a super key of that specific relation. It is stronger than 3NF. The functional dependencies are present in 1NF, 2NF and 3NF. It has low redundancy in comparison to 3NF.

### Which is stronger Boyce-Codd normal form or 3NF?

Boyce-Codd Normal Form (BCNF) : It should already be in 3NF. For a functional dependency say P->Q, P should be a super key. BCNF is an extension of 3NF and it is has more strict rules than 3NF. Also, it is considered to be more stronger than 3NF.

What’s the difference between 3NF and 2NF?

3NF is used to reduce data duplication and to attain data integrity. This relation is in 3NF as it is already in 2NF and has no transitive dependency. Also there is no non prime attribute that is deriving a non prime attribute. 2. Boyce-Codd Normal Form (BCNF) :