What is a benefit of using primary and foreign keys in a relational database?

What is a benefit of using primary and foreign keys in a relational database?

• A. They can cause data redundancy.
• B. They help to improve data integrity and reduce redundancy.
• C. They slow down the database operations.
• D. They limit the database structure to one table.

Answer: (B)

Using primary and foreign keys in a relational database is crucial for maintaining the organization, integrity, and efficiency of the data. Primary keys serve as unique identifiers for each record in a table, ensuring that no two records are identical, which is essential for data integrity. They guarantee that each entry can be accessed, updated, or referenced precisely. Foreign keys establish a relationship between two tables by linking the primary key of one table to a field in another. This relationship enforces referential integrity, meaning that every foreign key value must match a primary key value in the referenced table, ensuring that all references are valid. This interconnectedness facilitates the seamless operation of queries across multiple tables while preventing orphaned records or incomplete data relationships. Moreover, the utilization of primary and foreign keys inevitably leads to a reduction in data redundancy. By establishing relationships between tables, data that would otherwise be duplicated across multiple tables can instead be stored in one location, thereby minimizing unnecessary data storage and potential data inconsistencies. This practice enhances the overall reliability and robustness of the database, making it an essential aspect of relational database design. Therefore, the benefit derived from using primary and foreign keys lies in their ability to bolster data integrity and reduce redundancy effectively.

Using primary and foreign keys in a relational database is crucial for maintaining the organization, integrity, and efficiency of the data. Primary keys serve as unique identifiers for each record in a table, ensuring that no two records are identical, which is essential for data integrity. They guarantee that each entry can be accessed, updated, or referenced precisely.

Foreign keys establish a relationship between two tables by linking the primary key of one table to a field in another. This relationship enforces referential integrity, meaning that every foreign key value must match a primary key value in the referenced table, ensuring that all references are valid. This interconnectedness facilitates the seamless operation of queries across multiple tables while preventing orphaned records or incomplete data relationships.

Moreover, the utilization of primary and foreign keys inevitably leads to a reduction in data redundancy. By establishing relationships between tables, data that would otherwise be duplicated across multiple tables can instead be stored in one location, thereby minimizing unnecessary data storage and potential data inconsistencies.

This practice enhances the overall reliability and robustness of the database, making it an essential aspect of relational database design. Therefore, the benefit derived from using primary and foreign keys lies in their ability to bolster data integrity and reduce redundancy effectively.