How do you convert 2NF to 3NF?

The normalization of 2NF relations to 3NF involves the removal of transitive dependencies. If a transitive dependency exists, we remove the transitively dependent attribute(s) from the relation by placing the attribute(s) in a new relation along with a copy of the determinant. Consider the examples given below.

Can 2NF and 3NF be same?

The examples of design that is not in 2NF and not in 3NF are not the same. Yes, the dependency in both cases is on a single field. However, in non 2NF example: while in non 3NF example (which is in 2NF):

How do I normalize a database to 3NF?

You must achieve the second normal form before you can achieve the third normal form (3NF).

1. 0NF: Not Normalized. The data in the table below is not normalized because it contains repeating attributes (contact1, contact2,…).
2. 1NF: No Repeating Groups.
3. 2NF: Eliminate Redundant Data.
4. 3NF: Eliminate Transitive Dependency.

What is 2NF in DBMS with example?

What is 2NF? The second step in Normalization is 2NF. A table is in 2NF, only if a relation is in 1NF and meet all the rules, and every non-key attribute is fully dependent on primary key. The Second Normal Form eliminates partial dependencies on primary keys.

When do you use 3NF in a DBMS?

3NF is used to reduce the data duplication. It is also used to achieve the data integrity. If there is no transitive dependency for non-prime attributes, then the relation must be in third normal form.

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

Difference between 2NF and 3NF : S.NO. 2NF(Second Normal Form) 3NF(Third Normal Form) 1. It is already in 1NF. It is already in 1NF as well as in 2NF also. 2. In 2NF non-prime attributes are allowed to be functionally dependent on non-prime attributes.

When to use 1NF or 2NF in normalization?

Normalization divides the larger table into the smaller table and links them using relationship. The normal form is used to reduce redundancy from the database table. A relation is in 1NF if it contains an atomic value. A relation will be in 2NF if it is in 1NF and all non-key attributes are fully functional dependent on the primary key.

When does a relation be in 1NF or 2NF?

Normal Form Description; 1NF: A relation is in 1NF if it contains an atomic value. 2NF: A relation will be in 2NF if it is in 1NF and all non-key attributes are fully functional dependent on the primary key. 3NF: A relation will be in 3NF if it is in 2NF and no transition dependency exists. 4NF