From the choices below,identify the attribute below that would make the best primary key.
A) height (in inches)
B) date of first purchase
C) zip code
D) customer telephone number

Question

Quizplus · Accepted Answer

Customer telephone number would make the best primary key as it is unique to each customer and can be easily used to identify and retrieve customer information. Height (in inches) and zip code may have duplicates and can cause data redundancy. Date of first purchase may not be unique to each customer, as multiple customers could have made their first purchase on the same date.

From the Choices Below,identify the Attribute Below That Would Make