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Entity Relationship Diagrams Video Lecture | Accountancy Class 11 - Commerce

123 videos|135 docs|51 tests

FAQs on Entity Relationship Diagrams Video Lecture - Accountancy Class 11 - Commerce

1. What is an Entity Relationship Diagram (ERD)?
Ans. An Entity Relationship Diagram (ERD) is a visual representation of the relationships between entities in a database. It helps to illustrate how different entities are connected and how they interact with each other.
2. Why is an Entity Relationship Diagram important in database design?
Ans. An Entity Relationship Diagram is important in database design as it provides a clear and concise overview of the database structure. It helps designers to understand the relationships between entities, identify key attributes, and ensure the integrity and accuracy of the data model.
3. What are the main components of an Entity Relationship Diagram?
Ans. The main components of an Entity Relationship Diagram are entities, attributes, relationships, and cardinality. Entities represent the objects or concepts in a database, attributes define the properties of entities, relationships show how entities are connected, and cardinality defines the number of instances involved in a relationship.
4. How is cardinality represented in an Entity Relationship Diagram?
Ans. Cardinality in an Entity Relationship Diagram is represented by using symbols and notations. The "crow's foot" notation is commonly used, where a single line indicates a one-to-one relationship, a crow's foot indicates a one-to-many relationship, and a circle indicates a many-to-many relationship.
5. What are the benefits of using an Entity Relationship Diagram in database development?
Ans. Using an Entity Relationship Diagram in database development offers several benefits. It helps to visualize and communicate the structure of the database, enables effective collaboration between stakeholders, assists in identifying and resolving design issues early on, and serves as documentation for future reference and maintenance.
123 videos|135 docs|51 tests

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