Description: An entity identifier is a fundamental concept in the field of databases, referring to a unique value assigned to each entity within an information system. This identifier allows for distinguishing one entity from another, ensuring data integrity and accuracy. In the context of relational databases, the entity identifier is often a primary key, which can be an integer, a UUID (Universally Unique Identifier), or any other data type that guarantees its uniqueness. The importance of entity identifiers lies in their ability to facilitate the retrieval, updating, and deletion of records, as well as their role in creating relationships between different tables. In more complex systems, such as those using Public Key Infrastructure or NoSQL databases, entity identifiers can take on more sophisticated forms, adapting to the specific needs of each application. In summary, the entity identifier is essential for the organization and management of data, allowing information systems to operate efficiently and effectively.
