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Free CompTIA ITF+ FC0-U61 Practice Question

Which of the following BEST describes the purpose of a uniqueness constraint in a database?

  • It requires all records in the database to relate to another record in a different table.

  • It ensures that all values in a specific column are different, preventing duplicate entries.

  • It connects two tables together using a common column found in both tables.

  • It uniquely identifies each row in a table and cannot be NULL.

This question's topic:
CompTIA ITF+ FC0-U61 / 
Database Fundamentals
Your Score:
Database Fundamentals
IT Concepts and Terminology
Infrastructure
Applications and Software
Software Development Concepts
Security