Computer Science Engineering (CSE) Exam > Computer Science Engineering (CSE) Videos > Question Bank for GATE Computer Science Engineering > Introduction To E-R Diagrams & Class Hierarchies
Introduction To E-R Diagrams & Class Hierarchies Video Lecture | Question Bank for GATE Computer Science Engineering - Computer Science Engineering (CSE)
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FAQs on Introduction To E-R Diagrams & Class Hierarchies Video Lecture - Question Bank for GATE Computer Science Engineering - Computer Science Engineering (CSE)
| 1. What is an E-R diagram and how is it used in computer science engineering? |  |
Ans. An E-R (Entity-Relationship) diagram is a visual representation of the entities, attributes, and relationships between them in a database. It is used in computer science engineering to model and design database systems. The diagram helps in understanding the structure of the database, identifying relationships between entities, and determining the cardinality and participation constraints.
| 2. Can you explain the concept of class hierarchies in computer science engineering? | |
Ans. Class hierarchies in computer science engineering refer to the organization of classes in a hierarchical structure, where each class inherits properties and behaviors from its parent class. This concept is used in object-oriented programming to create a relationship between classes and establish a hierarchy of related objects. It allows for code reuse, modularity, and polymorphism.
| 3. What are some common elements represented in an E-R diagram? | |
Ans. Some common elements represented in an E-R diagram are entities, attributes, relationships, and cardinality constraints. Entities represent real-world objects or concepts, attributes define the characteristics of entities, relationships depict the associations between entities, and cardinality constraints specify the number of occurrences of one entity that can be associated with another entity.
| 4. How do E-R diagrams help in database design and development? | |
Ans. E-R diagrams help in database design and development by providing a visual representation of the database structure. They assist in identifying entities, attributes, and relationships, which are crucial for defining the schema of the database. E-R diagrams also aid in determining the normalization levels, establishing referential integrity, and ensuring efficient data retrieval and manipulation.
| 5. What is the difference between a superclass and a subclass in class hierarchies? | |
Ans. In class hierarchies, a superclass is a higher-level class that serves as a general template or blueprint for its subclasses. It defines common attributes and behaviors that are inherited by its subclasses. On the other hand, subclasses are specific classes that inherit properties and behaviors from their superclass. They can have additional attributes and behaviors unique to themselves while still inheriting the characteristics of the superclass.
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Nov 18, 2024 Last updated |
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