1. Entities: These are the main objects or subjects in the system being modeled. They are usually represented by rectangles in the diagram. For example, in a university database, the entities might be Students, Courses, and Professors.

2. Attributes: These are the properties or characteristics of the entities. They are usually represented by ovals connected to their entity rectangle. For example, the Student entity might have attributes like Student ID, Name, and Major.

3. Relationships: These are the associations or interactions between entities. They are usually represented by diamonds connected by lines to the entities involved. For example, a relationship might be "Student takes Course" or "Professor teaches Course".

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1. Entities: These are the main objects or subjects in the system being modeled. They are usually represented by rectangles in the diagram. For example, in a university database, the entities might be Students, Courses, and Professors.

2. Attributes: These are the properties or characteristics of the entities. They are usually represented by ovals connected to their entity rectangle. For example, the Student entity might have attributes like Student ID, Name, and Major.

3. Relationships: These are the associations or interactions between entities. They are usually represented by diamonds connected by lines to the entities involved. For example, a relationship might be "Student takes Course" or "Professor teaches Course".

Knowee AI · Accepted Answer

1. Entities: These are the main objects or subjects in the system being modeled. They are usually represented by rectangles in the diagram. For example, in a university database, the entities might be Students, Courses, and Professors.

2. Attributes: These are the properties or characteristics of the entities. They are usually represented by ovals connected to their entity rectangle. For example, the Student entity might have attributes like Student ID, Name, and Major.

3. Relationships: These are the associations or interactions between entities. They are usually represented by diamonds connected by lines to the entities involved. For example, a relationship might be "Student takes Course" or "Professor teaches Course".

Describe three key components of an ERD.

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