Discussion
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- Question
The EXISTS keyword will be true if any row in the subquery meets the condition.
Options- A. True
- B. False
- Correct Answer
- True
- 1. Dependency graphs are diagrams that consist of nodes and arcs that show the dependencies of a database.
Options- A. True
- B. False Discuss
- 2. A regular subquery is processed from the bottom up.
Options- A. True
- B. False Discuss
- 3. Although creating test databases is a critical and necessary job, there are few career opportunities in this area.
Options- A. True
- B. False Discuss
- 4. Typically, there should be at least two different copies of the database schema used in the redesign process.
Options- A. True
- B. False Discuss
- 5. Reverse engineering is the process of reading a database schema and producing a data model from that schema.
Options- A. True
- B. False Discuss
- 6. Correlated subqueries are similar to a regular subquery.
Options- A. True
- B. False Discuss
- 7. Because of the need for extensive knowledge of SQL, many database developers choose to automate the redesign process.
Options- A. True
- B. False Discuss
- 8. If a database is built correctly the first time, it will not have to be redesigned.
Options- A. True
- B. False Discuss
- 9. Database redesign is especially difficult if the database has no data.
Options- A. True
- B. False Discuss
- 10. The data model produced from the reverse engineering process is a true logical model.
Options- A. True
- B. False Discuss
Database Redesign problems
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