Showing posts with the label E-R Diagram

An E-R Diagram for Binary Relationship with Attributes

A  Entity-Relationship (E-R) Diagram for binary relationships with attributes. In  this provide explanation along with examples and diagrams. Entity-Relationship (E-R) Model :  The E-R model is a powerful tool for designing and visualizing database systems. It represents the logical structure of a database by defining entities, their attributes, and the relationships between them. In an E-R diagram, entities are depicted as rectangles, attributes as ellipses, and relationships as diamonds.  Components of E-R Diagram : Entity : An entity represents a real-world object or concept. It can be a person, place, thing, or event. Strong Entity : A strong entity has its own unique identifier (primary key) and does not depend on other entities. Weak Entity : A weak entity depends on another entity for its existence and has a partial key. Attribute : An attribute describes a property or characteristic of an entity. Relationship : A relationship defines an association between two or more entities