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What is meant by controlled redundancy? What anomalies are produced due to redundancy? What is referential integrity? Describe the abstraction levels of database models: ie-

What is meant by controlled redundancy?

What anomalies are produced due to redundancy?

What is referential integrity?

Describe the abstraction levels of database models: ie- Internal vs external model; conceptual Vs Internal, etc.

What are the business rules?

What is a weak entity?

What are SQL joins and how do they work?

What is an existence dependent entity? Give an example

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