Author Question: An artificial column added to a relation to serve as the primary key is a ________. A) composite ... (Read 67 times)

scienceeasy · **on:** Jul 7, 2018

An artificial column added to a relation to serve as the primary key is a ________.

A) composite key
B) candidate key
C) foreign key
D) surrogate key

Question 2

Which of the following is not a good reason for designing a data model?

A) It's easier to change things in the data model than it is in the actual DBMS.
B) The data model provides a simplified view of the database that can be shown to people who don't need to see all the details.
C) Creating a data model will help you understand the application area better.
D) The data model can be discarded after the database is operational.