What does a Parent Class refer to in database design?

• A. A table that contains only unique records
• B. A table that extends multiple child classes
• C. A table from which a child class derives
• D. A table that serves as a data repository

Answer: (C)

In database design, a Parent Class refers to a table from which a child class derives. This concept stems from object-oriented programming and data modeling, where classes inherit properties and methods from parent classes. In the context of a relational database, the parent class represents a base entity, capturing common attributes that can be shared across various related entities, represented as child classes.

Child classes inherit the characteristics of the parent class while also having the ability to introduce additional attributes or behaviors unique to them. This hierarchical structure aids in organizing data efficiently, enabling code reuse and reducing redundancy. It also facilitates the implementation of polymorphism, allowing for flexible interactions with different data types in a consistent manner.

The other options do not accurately capture the definition of a Parent Class in relational database design. While unique records and data repositories serve important functions in databases, they do not encompass the concept of hierarchical class relationships. Multiple child classes indicate a dependency structure but don't define what a parent class fundamentally is.