What is the main difference between 3NF and BCNF?
Difference between 3NF and BCNF :
|1.||In 3NF there should be no transitive dependency that is no non prime attribute should be transitively dependent on the candidate key.|
|2.||It is less stronger than BCNF.|
|3.||In 3NF the functional dependencies are already in 1NF and 2NF.|
|4.||The redundancy is high in 3NF.|
Which statement about the relationship between 3NF and BCNF is correct?
A relation R is in 3NF if every non-prime attribute of R is fully functionally dependent on every key of R but this does not guarantee transitive dependency. Every relation is BCNF must be in 3NF. Any relation can be in both BCNF & 3NF if it satisfies the condition of BCNF. Hence, the correct answer is “option 3”.
What is and BCNF explain its differences with suitable example?
BCNF is the advance version of 3NF. It is stricter than 3NF. A table is in BCNF if every functional dependency X → Y, X is the super key of the table. For BCNF, the table should be in 3NF, and for every FD, LHS is super key….EMP_DEPT_MAPPING table:
Why BCNF is better than 3NF explain with an example?
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.
How is BCNF better than 3NF?
Why is BCNF better than 3NF?
What are the benefits of BCNF and 3NF?
Though 3NF insist on removing non-key dependencies, it accepts a transitive FD where a key attribute determined by non-key attribute. BCNF eliminates this FD too to become a stricter normal form.
What do you mean by 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 the difference between BCNF and 3NF?
Key Differences Between 3NF and BCNF 3NF states that no non-prime attribute must be transitively dependent on the candidate key of the relation. On the other hands, BCNF states that if a trivial functional dependency X -> Y exist for a relation; then X must be a super key. 3NF can be obtained without sacrificing the dependency of relation.
What is 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) :
What is the difference between BCNF and Super key?
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 is meant by 3NF in DBMS?
1. Third Normal Form (3NF) : A relation is said to be in Third Normal Form (3NF), if it is in 2NF and when no non key attribute is transitively dependent on the primary key i.e., there is no transitive dependency. Also it should satisfy one of the below given conditions.