In a relational database, a primary key is used to:
Correct answer: A. Identify each record uniquely in a table
- A. Identify each record uniquely in a table
- B. Encrypt every file on the organization's network
- C. Display charts on a manager's dashboard
- D. Sort employees according to job title only
Explanation
A primary key uniquely identifies each record in a database table and prevents confusion between similar records. Encryption and dashboard display are separate information system functions.
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About Business Communication and Information Systems
Business communication covers the sender, message, medium, receiver and feedback, together with formal and informal channels, written and oral reports, nonverbal signals and barriers such as language, noise and poor listening. Information systems explain how data becomes useful information through transaction processing, management reporting and decision-support systems.
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