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primary key

A primary key is a unique identifier in a database that distinguishes each record in a table. Think of it like a social security number for individuals; no two people have the same number, which helps avoid confusion. Similarly, in a database, the primary key ensures that each entry is distinct and can be accurately referenced or retrieved. It can be a single piece of information, like an ID number, or a combination of multiple pieces. By having a primary key, the database can maintain order and integrity, making it easier to manage and access data effectively.

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    A primary key is a unique identifier for a record in a database. Think of it as a personal identification number (PIN) for each entry in a table—it ensures that every piece of information can be distinguished from one another. For example, in a student database, each student might have a unique student ID. This ID acts as the primary key, allowing us to quickly find, update, or relate that student’s information without confusion with others. In essence, it ensures data integrity and helps organize information efficiently.