Entity Relationship Diagram (ERD)
a drawing or diagram of the database schema
An Entity Relationship Diagram (ERD) is a visual representation of the relationships between different entities (or objects) in a database. It is a way of illustrating the relationships between different pieces of data and provides a clear understanding of how they are connected.
The main components of an ERD are entities, attributes, and relationships. Entities are the objects of interest in your database, such as customers, products, or sales. Attributes are the specific details or characteristics of an entity, such as customer name, product price, or sale date. Relationships refer to the connections between different entities, such as the fact that a customer can make multiple purchases, or that a product can have multiple suppliers.
ERDs are an important tool in database design as they help to ensure that the data in a database is structured properly, with each piece of information linked to the correct entity and related information. This helps to prevent common issues such as data redundancy or inconsistency, and allows for efficient storage and retrieval of information. Ultimately, ERDs are a key aspect of developing a robust and effective database system.
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