MCQ Detailed View

In an Entity-Relationship (E-R) diagram, a rectangle is used to represent an Entity. An entity is a real-world object or concept that has a distinct existence and is represented in a database. Entities can be physical objects like students, employees, and books, or abstract concepts like departments or courses.

Each entity typically has attributes, which describe its characteristics. For example, a "Student" entity may have attributes like Roll Number, Name, and Class. In E-R diagrams:

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  Rectangles represent Entities.

  
  


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  Ellipses represent Attributes.

  
  


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  Diamonds represent Relationships between entities.

  
  


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  Lines connect entities to attributes and relationships.