A supertype/subtype hierarchy is which of the following?
A. Each subtype has only one attribute
B. Each supertype has only one attribute
C. Each subtype has only one supertype
D. Each supertype has only one subtype
Answer:A
A supertype/subtype hierarchy is which of the following?
A. Each subtype has only one attribute B. Each supertype has only one attribute C. Each subtype has only one supertype D. Each supertype has only one subtype