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An Entity Relationship Diagram (ERD) is a visual representation of the entities within a system and the relationships between them. It is a crucial tool in database design, helping to structure and understand the database's logical framework.
Components of an ERD
Entities
Entities are objects or concepts that can have data stored about them. They are represented as rectangles in an ERD. Entities can be:
Strong Entities: These have a primary key and do not depend on other entities. For example, a student entity.
Weak Entities: These depend on a strong entity and have a foreign key. For example, an enrollment entity1.
Relationships
Relationships define how two entities are related. They are represented as lines connecting entities, often with labels to describe the relationship (e.g., "enrolls", "registers"). Types of relationships include:
What is an Entity Relationship Diagram (ERD)? - Lucidchart
Learn what an ER diagram is, how to use it to design or troubleshoot databases, and what symbols and features it contains. Explore the history, origins and applications of ER diagrams …
Introduction of ER Model - GeeksforGeeks
- Entity, Entity Type, Entity Set – An Entity may be an object with a physical …
- Attribute(s): Attributes are the properties which define the entity type. For …
- Relationship Type and Relationship Set: A relationship type represents the …
- Degree of a relationship set: The number of different entity sets participating …
- Cardinality: The number of times an entity of an entity set participates in a …
What is Entity Relationship Diagram (ERD)? - Visual …
Learn what is ERD, why ERD, ERD notations, how to draw ERD, and see ERD examples. ERD is a structural diagram for database design, debugging, creation, and requirements gathering.
Entity–relationship model - Wikipedia
In a relational database a relationship between entities is implemented by storing the primary key of one entity as a pointer or "foreign key" in the table of another entity. There is a tradition for …
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How to Draw Entity Relationship Diagrams (ERDs)
Jun 3, 2024 · Learn the steps and benefits of designing an ER diagram, a graphical representation of entities and their relationships in a database system. See an example of an ER diagram for a bank with entities, attributes, …
What is an entity relationship diagram? - IBM
Jun 24, 2024 · Learn what an entity relationship diagram (ERD) is, how it is used for database design and data modeling, and what symbols and types of entities, attributes and relationships …
Entity Relationship Diagram (ERD) - What is an ER …
Learn how to create and use ERDs to visualize the relationships between entities in a database. Explore the history, types, symbols, cardinality, and models of ERDs with examples and tips.
Entity Relationship (ER) Diagram Model with DBMS …
Dec 31, 2024 · ER Model stands for Entity Relationship Model is a high-level conceptual data model diagram. ER model helps to systematically analyze data requirements to produce a well-designed database. The ER Model represents …
entity relationship diagram (ERD) - TechTarget
An entity relationship diagram (ERD), also known as an entity relationship model, is a graphical representation that depicts relationships among people, objects, places, concepts or events in …
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