What is a primary key?
A) A field (or group of fields) that uniquely identifies a given entity in a table
B) A primary key of one table that appears as an attribute in another table and acts to provide a logical relationship among the two tables
C) Characteristics or properties of an entity class
D) A field (or group of fields) that uniquely identifies a given attribute in a table

Question

Quizplus · Accepted Answer

A primary key is a field (or group of fields) that uniquely identifies a given entity in a table. It is used to ensure that each record in the table is uniquely identifiable and to create logical relationships between tables through the use of foreign keys.

What Is a Primary Key