Database Normalization (3NF)

What is the main purpose of using normal forms in databases?

• To increase data redundancy

• To make databases more efficient by eliminating data redundancy

• To make databases more complex

• To store duplicate information for backup purposes

Answer explanation

The main purpose of using normal forms in databases is to make databases more efficient by eliminating data redundancy.

What does Third Normal Form (3NF) help to avoid in a database?

• Unique guest information

• Duplicate address information

• Efficient data storage

• Organized data

Answer explanation

Third Normal Form (3NF) helps to avoid duplicate address information in a database by ensuring that each piece of data is stored in only one place, reducing redundancy and improving data integrity.

How does 3NF improve the efficiency of a database?

• By storing the same information multiple times

• By making it easier to search or update information

• By linking each guest to their corresponding address with a name

• By creating a separate table for each guest

Answer explanation

3NF improves the efficiency of a database by making it easier to search or update information, reducing redundancy and ensuring data integrity.

In the party guest list example, how would 3NF handle guests living at the same address?

• By repeating the address information for each guest

• By creating a separate table for guest names only

• By storing the address information once and linking guests to it

• By assigning a unique name to each address

Answer explanation

By storing the address information once and linking guests to it

What is one of the benefits of using 3NF to reduce data redundancy?

• It allows storing the same data multiple times.

• It separates repeating information into different tables.

• It combines all data into a single table.

• It increases the need for data normalization.

Answer explanation

Using 3NF separates repeating information into different tables, reducing data redundancy and improving data integrity.

How does 3NF contribute to easier data management?

• By having a single table for all types of data.

• By making it harder to search, update, and delete information.

• By having separate tables for different types of data, making the database more organized and efficient.

• By mixing different types of data in the same table.

Answer explanation

3NF contributes to easier data management by having separate tables for different types of data, making the database more organized and efficient.

What is improved as a result of separating data into different tables according to 3NF?

• Data complexity

• Data integrity

• Data redundancy

• Data confusion

Answer explanation

Separating data into different tables according to 3NF improves data integrity by reducing data redundancy and ensuring that each piece of data is stored in only one place, reducing the risk of inconsistencies.

Which normal form is primarily concerned with reducing redundancy and dependency by ensuring that each attribute is dependent on the primary key?

• First Normal Form (1NF)

• Second Normal Form (2NF)

• Third Normal Form (3NF)

• Boyce-Codd Normal Form (BCNF)

Answer explanation

Third Normal Form (3NF) is primarily concerned with reducing redundancy and dependency by ensuring each attribute is dependent on the primary key.