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Database Re-Engineering and Redesign

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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.

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Database re-engineering and redesign issues are embedded in the solution.

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

Most database design work involves redesigning existing databases. Re engineering is necessary both to fix mistakes made during the initial database design and also to adapt the database to changes in system requirements. Such changes are common because information systems and organizations do not just influence each other they create each other. Thus, new information systems cause changes in systems requirements.

2. ...

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