ER diagrams 1

Entity type in ER diagram is represented as

• Double diamonds

• Rectangle

• Diamond

• oval

For a weak entity type to be meaningful, it must be associated with another entity type called

• Identifying type

• Owner set

• Neighbour set

• Strong entity set

Weak entity set is represented as

• Underline

• Double line

• Double diamond

• Double rectangle

If you were collecting and storing information about your music collection, an album would be considered a(n)

• Relation type

• Entity type

• Instance

• Attribute

A recursive relationship is a relationship between an entity and

• Itself

• A subtype entity

• An archetype entity

• An instance

In which of the following is single entity instance of one type related to many entity instances of another type?

• One to one relationship

• One to many relationship

• Many to many relationship

Properties that describe the characteristics of entities are called

• Entities

• Attributes

• Identifiers

• Relationships

In which of the following is a single entity instance of one type of related to a related to a single entity instance of another type?

• One to one relationship

• One to many relationship

• Many to one relationship

• Many to many relationship

All instances of an entity type have the same attributes

• True

• False

A ternary relationships is so called because it contains two entity types and one association between them.

• True

• False