How is inheritance used in database?
Table of Contents
How is inheritance used in database?
You can represent inheritance in the database in one of two ways:
- Multiple tables that represent the parent class and each child class.
- A single table that comprises the parent and all child classes.
What is abstraction and inheritance?
Abstraction is an OOP concept that hides the implementation details and shows only the functionality to the user. In contrast, Inheritance is the methodology of creating a new class using the properties and methods of an existing class. Thus, this reflects the main difference between abstraction and inheritance.
How is inheritance implemented in SQL?
Using “sub-type” tables is a simple way to implement table inheritance in SQL Server. For example, a question came up recently about modeling the following entities in a “School” database: Students. Teachers.
What are the three levels of data abstraction in DBMS?
There are mainly 3 levels of data abstraction:
- Physical: This is the lowest level of data abstraction.
- Logical: This level comprises the information that is actually stored in the database in the form of tables.
- View: This is the highest level of abstraction.
What do you mean by data abstraction give an example?
Data abstraction refers to providing only essential information about the data to the outside world, hiding the background details or implementation. Consider a real life example of a man driving a car.
How are abstraction and inheritance linked with each other?
Abstraction ensures simplicity. Inheritance has to do with methods and functions inheriting the attributes of another class. Polymorphism allows program code to have different meaning or functions while encapsulation is the process of keeping classes private so they cannot be modified by external codes.
How does inheritance is different from generalization explain with example?
Generalization is the term that we use to denote abstraction of common properties into a base class in UML. When we implement Generalization in a programming language, it is called Inheritance. So, Generalization and Inheritance are same, the terminology just differs depending on the context where it is being used.
What is multiple inheritance in DBMS?
Multiple inheritance a feature of some object-oriented programming languages in which a class or an object inherits characteristics and properties from more than one parent class or object. This is contrary to the single inheritance property, which allows an object or class to inherit from one specific object or class.
https://www.youtube.com/watch?v=LOgfAWwair4