Explain the concept of a primary key in a relat... - SS3 ICT Database Question

A primary key in a relational database is a unique identifier for each record or row in a table. Its importance lies in data integrity and record identification. By enforcing uniqueness, it ensures that no duplicate records exist in the table, preventing data inconsistencies. Additionally, it serves as a reference point for establishing relationships between tables through foreign keys. This helps maintain data consistency and enables efficient data retrieval, as the primary key is often used in querying and indexing.