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- Question
When mapping a many-to-many unary relationship into a relation which of the following is true?
Options- A. One relation is created.
- B. Two relations are created.
- C. Three relations are created.
- D. Four relations are created.
- Correct Answer
- Two relations are created.
- 1. If no multivalued attributes exist in a relation, then the relation is in what normal form?
Options- A. First normal form
- B. Second normal form
- C. Third normal form
- D. Fourth normal form Discuss
- 2. A relationship is which of the following?
Options- A. A person, place, or thing
- B. Property or characteristic of an entity
- C. Link between entities
- D. Weak entity Discuss
- 3. Which of the following conditions should exist if you want to convert a relationship to an associative entity?
Options- A. Some of the relationships for the participating entities are "many".
- B. The resulting associative entity has an independent meaning.
- C. The resulting associative entity has no attributes.
- D. All of the above Discuss
- 4. A rectangle represents which of the following in an ERD?
Options- A. Attribute
- B. Entity
- C. Optional One
- D. Relationship Discuss
- 5. A binary relationship is which of the following?
Options- A. A relationship between two attributes
- B. A relationship between two entities
- C. An attribute with two different relationships
- D. An entity with two different relationships Discuss
- 6. A foreign key is which of the following?
Options- A. Any attribute
- B. The same thing as a primary key
- C. An attribute that serves as the primary key of another relation
- D. An attribute that serves no purpose Discuss
- 7. A primary key is which of the following?
Options- A. Any attribute
- B. An attribute that uniquely identifies each row
- C. An attribute that uniquely identifies each column
- D. A derived attribute Discuss
- 8. Relations are:
Options- A. two-dimensional tables.
- B. three-dimensional tables.
- C. four-dimensional tables.
- D. five-dimensional tables. Discuss
- 9. A relation has which of the following properties?
Options- A. Each row is not unique.
- B. Attributes can have the same name within a given table.
- C. Each relation has a unique name.
- D. The order of the columns is significant. Discuss
- 10. When mapping a binary many-to-many relationship into a relation which of the following is true?
Options- A. One relation is created.
- B. Two relations are created.
- C. Three relations are created.
- D. Four relations are created. Discuss
Logical Database Design problems
Search Results
Correct Answer: First normal form
Correct Answer: Link between entities
Correct Answer: The resulting associative entity has an independent meaning.
Correct Answer: Entity
Correct Answer: A relationship between two entities
Correct Answer: An attribute that serves as the primary key of another relation
Correct Answer: An attribute that uniquely identifies each row
Correct Answer: two-dimensional tables.
Correct Answer: Each relation has a unique name.
Correct Answer: Three relations are created.
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