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Understanding Relationship Types in Database

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Understanding Relationship Types in Database

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Questions and Answers

What is a necessary condition for a weak entity in a database model?

It must participate in an identifying relationship type (correct)

It must be the primary key of the database

It must have a composite key

It must be standalone without any relationships

How is a weak entity identified in a database model?

By the identifying relationship type it is involved in (correct)

By having multiple unique keys

By its own primary key

By being standalone without any relationships

In the example given, how is a DEPENDENT entity identified?

By the dependent's first name and the associated EMPLOYEE (correct)

By the dependent's last name

By the dependent's social security number

By the dependent's date of birth

What is an identifying entity type in the context of weak entities?

An entity type that determines how a weak entity is uniquely identified Signup and view all the answers

What does the HoursPerWeek attribute of a relationship type like WORKS_ON describe in a database model?

The number of hours one employee works on a specific project per week Signup and view all the answers

How are individual participating entities related in a relationship set?

They are related using straight lines Signup and view all the answers

How is a relationship type represented in an ER diagram?

As a diamond-shaped box Signup and view all the answers

What is the significance of a diamond-shaped box in an ER diagram?

It displays a relationship type Signup and view all the answers

How are the participating entity types connected to the relationship type in an ER diagram?

Via straight lines Signup and view all the answers

What is the difference between an arrow and a straight line in an ER diagram?

An arrow shows directionality, while a straight line simply connects entities Signup and view all the answers