The primary key's main function is to uniquely identify a(n)____ within a table.
A) attribute
B) entity instance or row
C) entity subtype
D) natural identifier

Question

Quizplus · Accepted Answer

The primary key is used to uniquely identify an entity instance or row within a table. It is essential for data integrity and helps in efficient data retrieval. Option A is incorrect because the primary key is not used to identify an attribute, but rather the entity instance or row. Option C is incorrect as the primary key refers to the main entity, not the subtype. Option D is incorrect because the primary key is not a natural identifier, but an artificially created identifier to ensure uniqueness.

The Primary Key's Main Function Is to Uniquely Identify A(n)____