Author Question: The identifier of the entity becomes the ________ of the corresponding table. A) primary key B) ... (Read 82 times)

joesmith1212 · **on:** Jul 7, 2018

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.