Question

what is relationship ?what is the importance of the primary key

Answer 1

Please don't irrelevant questions except for studies

Answer 2

Primary Key-Foreign Key Relationships. To fully understand physical database models, it is important to understand the concepts behind primary key-foreign key relationships. A primary key-foreign key relationship defines a one-to-many relationship between two tables in a relational database.

Choosing a primary key is one of the most important steps in good database design. A primary key is a table column that serves a special purpose. Each database table needs a primary key because it ensures row-level accessibility.

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