Exam 4: Entity Relationship Er Modeling

What is a ternary relationship? Provide some business rules examples that specify the need for a ternary or higher- order relationship.

Identifying the attributes of entities helps in the better understanding of among entities.

When the specific cardinalities are not included on the diagram in Crow's Foot notation, cardinality is implied by the use of _____.

A composite identifier is a primary key composed of more than one attribute.

A relationship exists when three entities are associated.

are characteristics of entities.

Explain multivalued attributes with the help of examples. How are multivalued attributes indicated in the Chen Entity Relationship model?

Participation is if one entity occurrence does not require a corresponding entity occurrence in a particular relationship.

Connectivities and cardinalities are established by concise statements known as business rules.

The Crow's Foot notation depicts the strong relationship with a(n) line between the entities.

Relationships between entities always operate in one direction.

Explain mandatory participation in an entity relationship.

Explain recursive relationships with the help of an example.

If an entity can exist apart from all of its related entities, then it is existence-independent, and it is referred to as a(n) entity.

The process of database design is a sequential process.

A person's Social Security number would be an example of a(n) attribute.

expresses the minimum and maximum number of entity occurrences associated with one occurrence of the related entity.

In implementation terms, an entity is existence-dependent if it has a mandatory primary key.

What is a weak relationship? Provide an example.

Unary relationships are common in manufacturing industries.