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.
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) in a table that uniquely identifies each record/entity in the table. It cannot contain null values and must be unique for each record.

What Is a Primary Key