What is Primary Key in SQL | SQL for Beginners

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In this video, we will learn about the primary key in SQL which is a fundamental concept that ensures the uniqueness and integrity of data within a database table. It is a column or a set of columns that uniquely identify each row in the table. The primary key enforces a rule that no two rows can have the same key value. It plays a crucial role in establishing relationships between tables, enabling efficient data retrieval, and maintaining data consistency.

When designing a database, selecting an appropriate primary key is essential to optimize performance and avoid data duplication. Commonly, an auto-incrementing numeric value or a unique identifier, like a Social Security Number or email address, is used as a primary key. Understanding primary keys is essential for database administrators, developers, and anyone working with SQL databases to build robust and well-organized systems.

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