Question

Which of the following features belongs to E-R diagrams?

• A. An entity set is shown as a rectangle
• B. The attributes, shown as ovals are connected to the entities or relationships by lines
• C. A diamond represents the relationship among a number of entities which are connected to the diamond by lines
• D. All of the above

Answer 1

Answer: (D)

All of the above

E-R diagrams:-

An entity relationship diagram (ERD) shows the relationships of entity sets stored in a database. An entity in this context is a component of data. ER diagrams illustrate the logical structure of databases.

Entities, which are represented by rectangle. An entity is an object or concept about which we want to store information.

Attributes, which are represented by ovals. A key attribute is the unique, distinguishing characteristic of the entity.

Actions, which are represented by diamond shapes, show how two entities share information in the database.