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- Question
Which of the following is a group of one or more attributes that uniquely identifies a row?
Options- A. Key
- B. Determinant
- C. Tuple
- D. Relation
- Correct Answer
- Key
- 1. Every time attribute A appears, it is matched with the same value of attribute B, but not the same value of attribute C. Therefore, it is true that:
Options- A. A ? B.
- B. A ? C.
- C. A ? (B,C).
- D. (B,C) ? A. Discuss
- 2. A tuple is a(n):
Options- A. column of a table.
- B. two dimensional table.
- C. row of a table.
- D. key of a table. Discuss
- 3. If attribute A determines both attributes B and C, then it is also true that:
Options- A. A ? B.
- B. B ? A.
- C. C ? A.
- D. (B,C) ? A. Discuss
- 4. A relation is in this form if it is in BCNF and has no multivalued dependencies:
Options- A. second normal form.
- B. third normal form.
- C. fourth normal form.
- D. domain/key normal form. Discuss
- 5. One solution to the multivalued dependency constraint problem is to:
Options- A. split the relation into two relations, each with a single theme.
- B. change the theme.
- C. create a new theme.
- D. add a composite key. Discuss
- 6. A key:
Options- A. must always be composed of two or more columns.
- B. can only be one column.
- C. identifies a row.
- D. identifies a column. Discuss
- 7. An attribute is a(n):
Options- A. column of a table.
- B. two dimensional table.
- C. row of a table.
- D. key of a table. Discuss
- 8. If attributes A and B determine attribute C, then it is also true that:
Options- A. A ? C.
- B. B ? C.
- C. (A,B) is a composite determinant.
- D. C is a determinant. Discuss
- 9. The primary key is selected from the:
Options- A. composite keys.
- B. determinants.
- C. candidate keys.
- D. foreign keys. Discuss
- 10. In the relational model, relationships between relations or tables are created by using:
Options- A. composite keys.
- B. determinants.
- C. candidate keys.
- D. foreign keys. Discuss
The Relational Model and Normalization problems
Search Results
Correct Answer: A ? B.
Correct Answer: row of a table.
Correct Answer: A ? B.
Correct Answer: fourth normal form.
Correct Answer: split the relation into two relations, each with a single theme.
Correct Answer: identifies a row.
Correct Answer: column of a table.
Correct Answer: (A,B) is a composite determinant.
Correct Answer: candidate keys.
Correct Answer: foreign keys.
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