A primary key used in a database is a ________.
A) group of rows that are formed to identify a unique table or file
B) column or group of columns that identifies a unique row in a table
C) character or byte that represents fields or columns
D) group of tables or files formed to identify a unique field or row

Question

Quizplus · Accepted Answer

A primary key is a column or group of columns that uniquely identifies each row in a table. It is used to ensure data integrity and to create links between tables in a database. Option A, C, and D do not accurately describe a primary key.

A Primary Key Used in a Database Is a ________