er model

1. In an ER diagram, a rectangle represents:

• A) Attribute

• B) Entity

• C) Relationship

• D) Key

2. An oval shape in an ER diagram is used for:

• An attribute of an entity or a relationship.
• A connector between entities.
• A process in a workflow diagram.
• A primary key in a database.

3. A diamond shape in an ER diagram represents:

• An attribute of an entity
• A primary key in a table
• A relationship between entities
• A data type in a database

4. A double rectangle is used for:

• A) Strong entity
  

• B) Attribute

• C) Weak entity
  

• D) Multivalued attribute
  

5. Which shape represents a multivalued attribute?

• A) Dashed oval
  

• B) Double oval
  

• C) Rectangle
  

• D) Circle
  

6. Underlined ovals in ER diagrams represent:

• Key attributes or primary keys
• Weak entities
• Relationships between entities
• Foreign keys

7. Composite attributes are represented using:

• Ellipse connected to ellipse
  

• Triangles
• Dashed ellipse

• Double rectangle
  

A derived attribute is represented by

• Solid oval

• Dashed oval
  

• Double oval

• Diamond

The relationship between entities represented using

Total participation of an entity in a relationship is shown using:

• Double line in an ERD
• Single line in an ERD
• Dashed line in an ERD
• No line in an ERD