A multivalued attribute in an ERD diagram becomes its own relation in a logical diagram.

O True

O False

In entity-relationship models, a member of a subtype does NOT necessarily have to be a member of the supertype.

O True

O False

Unlike columns, the rows of a relation may not be interchanged and must be stored in one sequence.

O True

O False

QUESTION 8

A primary key is an attribute that uniquely identifies each row in a relation.

O True

O False

9.A database that is developed using the systems development life cycle can be outdated by the time it is implemented.

O True

O False

A supertype and is subtypes in an EERD diagram each become their owm relation in a logical diagram.

O True

False

In a relational database data integrity is more important than speed. True False QUESTION 2 In this ERD, the Department entity is part of both a unary and a binary relationship. False QUESTION 3 There are two entity types participating in a unary relationship. True False QUESTION 4 In an entify-reiationship model, the participation of an entity in a relationship may be optional or mandatory. True False