What is a Primary Key in a Database and Why is it Important?

A primary key in a database is a unique identifier for each record in a table. It ensures that each record is distinct and can be easily identified. The primary key plays a crucial role in maintaining data integrity and enforcing data constraints.

Importance of a Primary Key in a Database:

• Uniqueness: Ensures that each record is uniquely identified, preventing duplicates and ensuring data accuracy.
• Data Integrity: Maintains data integrity by enforcing constraints and preventing inconsistencies in the database.
• Indexing: Helps in indexing and organizing data efficiently for faster retrieval and query performance.

Overall, the primary key is a fundamental concept in database design that ensures data reliability, consistency, and efficiency.