What allows a relation to contain multiple rows with a same primary key?
A.
RDBMS
B.
Polymorphism
C.
Polyinstantiation
D.
It is not possible
Explanation:
Polyinstantiation enables a table, which is also known as a relation, to contain multiple tuples with the same
primary keys, with each instance distinguished by a security level.
Incorrect Answers:
A: A relational database management system (RDBMS) is a database management system (DBMS) that is
based on the relational model. The database management system (DBMS) is a software suite that is used to
manage access to the database and provides data integrity and redundancy. It is usually controlled by a
database administrator.
B: Polymorphism is a concept in object-oriented programming in which objects are created from the same
parent class but have overload operators and performing different methods.
D: Polyinstantiation does allow a relation (table) to contain multiple tuples (rows) with the same primary key.Harris, Shon, All In One CISSP Exam Guide, 6th Edition, McGraw-Hill, New York, 2013, pp. 1136, 1170, 1186
http://en.wikipedia.org/wiki/Polyinstantiation
https://en.wikipedia.org/wiki/Relational_database_management_system
https://en.wikipedia.org/wiki/Polymorphism_(computer_science)