If you are working with SQL DB2, you may need to create tables that have primary and foreign keys to enforce data integrity and establish relationships between different entities.

However, creating this index isn't required. Data from two related tables can be combined even if no primary key or foreign key constraints are defined between the tables, but a foreign key ...

Foreign key is used to establish a link between two tables . it always define in reference of primary key ( another table ) . it act as a primary key in its own table and foreign key for another table ...

The difference between a composite key, a foreign key and a primary key is a good illustration of the complex and byzantine nature of relational database standards that make database administration an ...

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