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What is a Primary Key in DB2 and Why is it Important?

In DB2, a primary key is a unique identifier for a row in a table. It uniquely identifies each record in the table and ensures data integrity by enforcing uniqueness and providing a way to link related data in different tables.

Primary keys are important in DB2 for several reasons:

1. Uniqueness: A primary key must be unique for each record in the table, preventing duplicate entries and ensuring data integrity.
2. Relationships: Primary keys establish relationships between tables, allowing for efficient data retrieval and maintaining consistency across the database.
3. Indexing: Primary keys are automatically indexed in DB2, which improves query performance and speeds up data access.

Overall, a primary key in DB2 is crucial for maintaining data integrity, ensuring consistency, and optimizing database performance.

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