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- Question
A unique, DBMS-supplied identifier used as the primary key of a relation is called a(n):
Options- A. primary key.
- B. foreign key.
- C. composite key.
- D. surrogate key.
- Correct Answer
- surrogate key.
- 1. Which constraint requires that the binary relationship indicate all combinations that must appear in the ternary relationship?
Options- A. MUST COVER
- B. MUST NOT
- C. Both of the above.
- D. None of the above is correct. Discuss
- 2. Each answer below shows example data from a table. Which answer is an example of the missing values problem?
Options- A. Three columns have the values 534-2435, 534-7867, and 546-2356 in the same row.
- B. Three rows have the values Brown Small Chair, Small Chair Brown, and Small Brown Chair in the same column.
- C. Three rows have the values Brown, NULL, and Blue in the same column.
- D. One row has the value "He is interested in a Silver Porsche from the years 1978-1988" in a column. Discuss
- 3. When assessing the table structure of an acquired set of tables with data, counting the number of table rows is (part of) the:
Options- A. first step.
- B. second step.
- C. third step.
- D. fourth step. Discuss
- 4. If a table has been normalized so that all determinants are candidate keys, then that table is in:
Options- A. 1NF.
- B. 2NF.
- C. 3NF.
- D. BCNF. Discuss
- 5. Most of the time, modification anomalies are serious enough that tables should be normalized into:
Options- A. 1NF.
- B. 2NF.
- C. 3NF.
- D. BCNF. Discuss
- 6. For every relationship, how many possible sets of minimum cardinalities are there?
Options- A. Two
- B. Three
- C. Four
- D. Six Discuss
- 7. Which of the following data constraints would be used to specify that the value of cells in a column must be one of a specific set of possible values?
Options- A. A domain constraint
- B. A range constraint
- C. An intrarelation constraint
- D. An interrelation constraint Discuss
- 8. A foreign key is:
Options- A. a column containing the primary key of another table.
- B. used to define data types.
- C. used to define null status.
- D. all of the above are above correct. Discuss
- 9. For every relationship, how many possible types of actions are there when enforcing minimum cardinalities?
Options- A. Two
- B. Three
- C. Four
- D. Six Discuss
- 10. Which of the following column properties specifies whether or not cells in a column must contain a data value?
Options- A. Null status
- B. Data type
- C. Default value
- D. Data constraints Discuss
Data Models into Database Designs problems
Search Results
Correct Answer: MUST COVER
Correct Answer: Three rows have the values Brown, NULL, and Blue in the same column.
Correct Answer: first step.
Correct Answer: BCNF.
Correct Answer: BCNF.
Correct Answer: Four
Correct Answer: A domain constraint
Correct Answer: a column containing the primary key of another table.
Correct Answer: Six
Correct Answer: Null status
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