Why is relationship created between multiple tables.give answer.
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Answer: The answer is to split our data up across multiple different tables, and create relationships between them. The process of splitting up data in this way to remove duplication and improve data integrity is known as normalization.
Normalization is a deep topic, and there are complex sets of rules which dictate the extent to which a database is judged to be normalized. These rule-sets, known as 'normal forms', are beyond the scope of this book; for now there are two important things to remember:
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