Why database re-engineering and redesign is required

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Reference no: EM1336020

1. Explain why database re-engineering and redesign is necessary.

2. What is the difference between a correlated subquery and a regular subquery?

3. Explain what is done when a NOT NULL column is added to a table.

4. What is a dependency graph?

5. Explain what should be done when adding tables and relationships for normalization.

Reference no: EM1336020

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