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What is Relational Database and Primary Key in Database?

What is relational database? What does it contain? What is the purpose of primary key in a database?

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Relational database is a collection of tables which contain information about relationship among entities. You need such a database to store and model real world informaiton such as banking, inventory, mailing list, etc.

Each table ...

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What is relational database? What does it contain? What is the purpose of primary key in a database?

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