The statement that best describes the purpose of Second Normal Form (2NF) is: "2NF ensures that every non-prime attribute is fully functionally dependent on the entire candidate key, thus removing partial functional dependencies."

Here's a step-by-step explanation:

1. In database normalization, the Second Normal Form (2NF) is a level of database schema design to prevent redundancy (duplication) of data.

2. To achieve 2NF, a table must first be in First Normal Form (1NF), which means that it has a primary key and no repeating groups of data.

3. Then, to meet the 2NF criteria, every non-prime attribute (an attribute that is not part of any candidate key) must be functionally dependent on the entire candidate key, not just part of it.

4. This means that if a table has a composite primary key (a primary key made up of multiple columns), then every other column in the table must be dependent on the entire composite key, not just one part of it.

5. This removes what's known as partial functional dependencies, where an attribute is functionally dependent on only a part of a composite candidate key.

6. So, the purpose of 2NF is to ensure full functional dependency and remove partial dependencies, which helps to maintain data integrity and reduce data redundancy.

Question

The statement that best describes the purpose of Second Normal Form (2NF) is: "2NF ensures that every non-prime attribute is fully functionally dependent on the entire candidate key, thus removing partial functional dependencies."

Here's a step-by-step explanation:

1. In database normalization, the Second Normal Form (2NF) is a level of database schema design to prevent redundancy (duplication) of data.

2. To achieve 2NF, a table must first be in First Normal Form (1NF), which means that it has a primary key and no repeating groups of data.

3. Then, to meet the 2NF criteria, every non-prime attribute (an attribute that is not part of any candidate key) must be functionally dependent on the entire candidate key, not just part of it.

4. This means that if a table has a composite primary key (a primary key made up of multiple columns), then every other column in the table must be dependent on the entire composite key, not just one part of it.

5. This removes what's known as partial functional dependencies, where an attribute is functionally dependent on only a part of a composite candidate key.

6. So, the purpose of 2NF is to ensure full functional dependency and remove partial dependencies, which helps to maintain data integrity and reduce data redundancy.

Knowee AI · Accepted Answer

The statement that best describes the purpose of Second Normal Form (2NF) is: "2NF ensures that every non-prime attribute is fully functionally dependent on the entire candidate key, thus removing partial functional dependencies."

Here's a step-by-step explanation:

1. In database normalization, the Second Normal Form (2NF) is a level of database schema design to prevent redundancy (duplication) of data.

2. To achieve 2NF, a table must first be in First Normal Form (1NF), which means that it has a primary key and no repeating groups of data.

3. Then, to meet the 2NF criteria, every non-prime attribute (an attribute that is not part of any candidate key) must be functionally dependent on the entire candidate key, not just part of it.

4. This means that if a table has a composite primary key (a primary key made up of multiple columns), then every other column in the table must be dependent on the entire composite key, not just one part of it.

5. This removes what's known as partial functional dependencies, where an attribute is functionally dependent on only a part of a composite candidate key.

6. So, the purpose of 2NF is to ensure full functional dependency and remove partial dependencies, which helps to maintain data integrity and reduce data redundancy.

Question

Solution

Similar Questions

Upgrade your grade with Knowee