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- Question
Which of the following is not true about modifying table columns?
Options- A. You can drop a column at any time.
- B. You can add a column at any time as long as it is a NULL column.
- C. You can increase the number of characters in character columns or the number of digits in numeric columns
- D. You cannot increase or decrease the number of decimal places.
- Correct Answer
- You cannot increase or decrease the number of decimal places.
- 1. A updatable view has its own data.
Options- A. True
- B. False Discuss
- 2. Well-structured relations encourage anomalies of data.
Options- A. True
- B. False Discuss
- 3. Entity instances are associated by relationship classes.
Options- A. True
- B. False Discuss
- 4. Composite identifiers consist of two or more attributes.
Options- A. True
- B. False Discuss
- 5. Queries that do full table scans should be avoided.
Options- A. True
- B. False Discuss
- 6. The World Wide Web Consortium (W3C) is the chief standards body for HTTP and HTML.
Options- A. True
- B. False Discuss
- 7. MySQL is pronounced "my See-quel."
Options- A. True
- B. False Discuss
- 8. The data model produced from the reverse engineering process does not include intersection table data.
Options- A. True
- B. False Discuss
- 9. The DBMS ranked as being the "hardest to use" in the text is Microsoft's SQL Server.
Options- A. True
- B. False Discuss
- 10. Three types of triggers are: BEFORE, AFTER and EXCEPTION.
Options- A. True
- B. False Discuss
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