The identifier of the entity becomes the ________ of the ...

[joesmith1212]

The identifier of the entity becomes the ________ of the corresponding table.
 
  A) primary key
  B) foreign key
  C) supertype
  D) subtype
  E) either A or B

Question 2

Which of the following is not true about primary keys?
 
  A) Primary keys cannot be null.
  B) Primary keys must be unique.
  C) Primary keys must be a single attribute.
  D) Primary keys are used to represent relationships.
  E) Primary keys can be defined using an SQL CONSTRAINT phrase.

[hanadaa]

Answer to Question 1

A

Answer to Question 2

C

[joesmith1212]

Excellent

[xiazhe]

TYSM