Understanding Normalization in Computer Science

What is the definition of normalization?

• Normalization refers to the act of increasing data redundancy.

• Normalization is the process of deleting all data from a database.

• Normalization is a method of encrypting sensitive data in a database.

• Normalization is the process of organizing data in a database to reduce redundancy and improve data integrity.

What is the primary function of normalization in databases?

• The primary function of normalization is to reduce data redundancy and improve data integrity.

• To enhance the speed of data retrieval without changing the structure.

• To increase data redundancy and decrease data integrity.

• To simplify the database design by merging all tables into one.

List two advantages of normalization.

• Increases data duplication.

• 1. Reduces data redundancy. 2. Improves data integrity.

• Simplifies database design.

• Decreases data integrity.

What are the different types of normalization?

• Normalization by elimination

• 1NF+, 2NF+, 3NF+

• Data normalization techniques

• 1NF, 2NF, 3NF, BCNF, 4NF, 5NF

Describe the first normal form (1NF).

• First Normal Form (1NF) allows for non-atomic values in columns.

• In 1NF, repeating groups are encouraged for better data organization.

• First Normal Form (1NF) ensures that all columns contain atomic values, each entry is of the same data type, and there are no repeating groups.

• 1NF requires that all entries in a column can be of different data types.

What is the purpose of the second normal form (2NF)?

• To eliminate all types of dependencies, including transitive dependencies.

• To ensure data redundancy and improve performance.

• To eliminate partial dependencies and ensure full functional dependency on the primary key.

• To group related data into separate tables without any dependencies.

Explain the third normal form (3NF).

• A table is in third normal form if it has a composite primary key.

• A table is in third normal form (3NF) if it is in second normal form and all the attributes are functionally dependent only on the primary key.

• A table is in first normal form if it has no repeating groups.

• A table is in third normal form if it contains no foreign keys.

What is denormalization and how does it relate to normalization?

• Denormalization eliminates the need for indexes in a database.

• Denormalization is the process of combining tables to improve read performance, while normalization organizes data to minimize redundancy.

• Normalization combines tables to enhance read performance.

• Denormalization is the process of splitting tables to reduce data size.

How does normalization improve data integrity?

• Normalization increases data duplication and inconsistency.

• Normalization complicates data relationships and access.

• Normalization has no effect on data integrity.

• Normalization improves data integrity by reducing redundancy and ensuring consistent data relationships.

What is the role of functional dependencies in normalization?

• Functional dependencies only apply to non-relational databases.

• Functional dependencies are used to increase redundancy in databases.

• Functional dependencies help identify and eliminate redundancy in database normalization.

• Functional dependencies are irrelevant to the normalization process.