# Database Design Section 7 Quiz Answers

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Section 7 Quiz (Answer all questions in this section)

1.   Which of the following would best be represented by an arc?
STUDENT ( University, Technical College) (*)
STUDENT (senior, male)
STUDENT (Grade A student, Average Student)

2.   Arcs model an Exclusive OR constraint. True or False?
True (*)
False

3.   Which of the following would best be represented by an arc?
STUDENT (Grade A student, Average Student)
PARENT (Girl, Bob)
TEACHER (Female, Bob)

4.   Arcs are used to visually represent _________ between two or more relationships in an ERD.
Inheritance
Sameness
Exclusivity (*)
Differences

5.   Arcs are Mandatory in Data modeling. All ERD's must have at least one Arc. True or False?
True
False (*)

6.   All relationships participating in an arc must be mandatory. True or False?
True
False (*)

7.   To visually represent exclusivity between two or more relationships in an ERD you would most likely use an ________.
Arc (*)
UID
Relationship
Attribute

8.   Every business has restrictions on which attribute values and which relationships are allowed. These are known as:
Entities.
Constraints. (*)
Attributes
Relationships

9.   A relationship between an entity and itself is called a/an:
Heirarchical Relationship
General Relationship
Recursive Relationship (*)
Invalid Relationship

10.   A single relationship can be both Recursive and Hierarchical at the same time. True or False?
True
False (*)

11.   Cascading UIDs are a feature often found in what type of Relationship?
Recursive Relationship
Heirarchical Relationship (*)
General Relationship
Invalid Relationship

12.   A Hierarchical relationship is a series of relationships that reflect entities organized into successive levels. True or False?
True (*)
False

13.   A Recursive Relationship is represented on an ERD by a/an:
Pig's Ear (*)
Dog's Tail
Single Toe
Crow's Foot

14.   A recursive relationship must be Mandatory at both ends. True or False?
True
False (*)

15.   Business organizational charts are often modeled as a Hierarchical relationship. True or False?
True (*)
False