Er Model And Business Rules(Database ) Questions and Answers

Question 1. An action assertion must include which of the following?
  1.    Anchor object
  2.    Action
  3.    Corresponding object
  4.    All of the above
Explanation:-
Answer: Option D. -> All of the above
Question 2. An oval represents which of the following in an EER?
  1.    Attribute
  2.    Entity
  3.    Optional One
  4.    Relationship
Explanation:-
Answer: Option A. -> Attribute
Question 3. When an entity instance must be a member of only one subtype, it is which of the following?
  1.    Disjoint with total specialization
  2.    Disjoint with partial specialization
  3.    Overlap with total specialization
  4.    Overlap with partial specialization
Explanation:-
Answer: Option A. -> Disjoint with total specialization
Question 4. Inheritance is which of the following?
  1.    When a supertype entity inherits values of the subtype attribute
  2.    When a subtype entity inherits values of the supertype attribute
  3.    When a supertype entity inherits values of another supertype attribute
  4.    When a subtype entity inherits values of another subtype attribute
Explanation:-
Answer: Option B. -> When a subtype entity inherits values of the supertype attribute
Question 5. A supertype/subtype hierarchy is which of the following?
  1.    Each subtype has only one attribute.
  2.    Each supertype has only one attribute.
  3.    Each subtype has only one supertype.
  4.    Each supertype has only one subtype.
Explanation:-
Answer: Option C. -> Each subtype has only one supertype.
Question 6. A rectangle represents which of the following in an EER?
  1.    Attribute
  2.    Entity
  3.    Optional One
  4.    Relationship
Explanation:-
Answer: Option B. -> Entity
Question 7. Which of the following statements concerning business rules is true?
  1.    It should be complex.
  2.    It should not be convertible to computer code.
  3.    It may include restrictions.
  4.    All of the above.
Explanation:-
Answer: Option C. -> It may include restrictions.
Question 8. Which one of the following symbols is not used in an ERD?
  1.    Rectangle
  2.    Oval
  3.    Diamond
  4.    Circle
Explanation:-
Answer: Option D. -> Circle
Question 9. Specialization is which of the following processes?
  1.    Defining one or more subtypes of the supertype and forming supertype/subtype relationships.
  2.    Defining one or more supertypes of the subtype and forming supertype/subtype relationships.
  3.    Defining one or more subtypes of the supertype and not forming supertype/subtype relationships.
  4.    Defining one or more supertypes of the subtype and not forming supertype/subtype relationships.
Explanation:-
Answer: Option A. -> Defining one or more subtypes of the supertype and forming supertype/subtype relationships.
Question 10. A supertype/subtype hierarchy has which of the following features?
  1.    Subtypes at the lower lever in the hierarchy inherit attributes only from their immediate supertype.
  2.    Attributes are assigned at the highest logical level.
  3.    Subtypes at the higher lever in the hierarchy inherit attributes only from their immediate subtype.
  4.    Attributes are assigned at the lowest logical level.
Explanation:-
Answer: Option B. -> Attributes are assigned at the highest logical level.
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