A primary key:
A)Is required for all types of files.
B)Should be unique.
C)Is used in conjunction with a secondary key and is less important than the secondary key.
D)Is the only field used to sort the records of a file.

Question

Quizplus · Accepted Answer

A primary key is a field or combination of fields that uniquely identify a record in a file. Therefore, it must be unique so that it can be used to distinguish one record from another. A primary key is not necessarily used in conjunction with a secondary key, and it is not necessarily less important than a secondary key. Additionally, while a primary key can be used to sort a file, it is not the only field used for sorting.

A Primary Key