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

[scienceeasy]

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.

[fromAlphatoOmega22]

Answer to Question 1

D

Answer to Question 2

D

[scienceeasy]

Gracias!

[phuda]

Excellent