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 (graduating, female)    
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)     
DELIVERY ADDRESS (Home, Office) (*)     
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



Lanjutan... Database Design Section 8 Quiz



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