Section 4 Quiz Database Design Oracle

Section 4 Quiz

            (Answer all questions in this section)

1.         A business rule such as "All accounts must be paid in full within 10 days of billing" is best enforced by:       Mark for Review

(1) Points

                                                           

            Creating a message to be printed on every bill that reminds the customer to pay within ten days.

            Making the relationship between CUSTOMER and PAYMENT fully mandatory and 1:1 on both sides.

            Creating additional programming code to identify and report accounts past due. (*)

            Making the payment attribute mandatory.

2.         A business rule such as "We only ship goods after customers have completely paid any outstanding balances on their account" is best enforced by:          Mark for Review

(1) Points

            Creating additional programming code to verify no goods are shipped until the account has been settled in full. (*)

            Making the payment attribute null.

            We need to trust our customers, and we know they will pay some day.

            Making the payment attribute optional.

3. How should you handle constraints that cannot be modeled on an ER diagram? Mark for Review

(1) Points

            Always let the network architect handle them

            Explain them to the users so they can enforce them

            All constraints must be modeled and shown on the ER diagram

            List them on a separate document to be handled programmatically (*)

4.         Which of the following is an example of a structural business rule?  Mark for Review

(1) Points

            All employees must belong to at least one department. (*)

            All products will have a selling price no less than 30 % greater than wholesale.

            All overdue payments will have an added 10 % late fee.

            Buildings to be purchased by the business must be current with earthquake building code.

5.         Can all constraints be modeled on an ER diagram?   Mark for Review

(1) Points

            No, and those that cannot be modeled should be listed on a separate document to be handled programmatically (*)

            No, in which case you should let the database administrator handle them

            Yes, all constraints must be modeled and shown on the ER diagram

            No, but you just explain them to the users so they can enforce them

6.         Why is it important to identify and document business rules?           Mark for Review

(1) Points

            It allows you to create a complete data model and then check it for accuracy. (*)

            It allows you to improve the client's business.

            It ensures that the data model will automate all manual processes.

            None of the above

7.         How would you model a business rule that states that girls and boys may not attend classes together?            Mark for Review

(1) Points

            Supertype STUDENT has two subtypes BOY and GIRL which are related to GENDER, which is related to CLASS (*)

            Use a supertype

            Make the attribute Gender optional

            Make the attribute Gender mandatory

8.         A subtype can have a relationship not shared by the supertype. True or False?         Mark for Review

(1) Points

            True (*)

            False

9.         A subtype is drawn on an ERD as an entity inside the "softbox" of the supertype. True or False?  Mark for Review

(1) Points

            True (*)

            False

10.       A subtype is shown on an ERD as an entity with a one to many relationship to the supertype. True or False?  Mark for Review

(1) Points

            True

            False (*)

11.       Which of the following is true about subtypes?         Mark for Review

(1) Points

            One instance of a supertype may belong to two subtypes.

            Subtypes should not be exhaustive.

            Subtypes must be mutually exclusive. (*)

            Subtypes must not be mutually exclusive.

12.       All instances of a subtype must be an instance of the supertype. True or False?       Mark for Review

(1) Points

            True (*)

            False

13.       A supertype can only have two subtypes and no more. True or False?          Mark for Review

(1) Points

            True

            False (*)

14.       You can only create relationships to a Supertype, not to a Subtype. True or False?  Mark for Review

(1) Points

            True

            False (*)

15.       A Supertype can have only one subtype. True or False?        Mark for Review

(1) Points

            True

            False (*)

1.         How would you model a business rule that states that on a student's birthday, he does not have to attend his classes?       Mark for Review

(1) Points

            Use a supertype

            Make the attribute Birthdate mandatory

            You cannot model this. You need to document it (*)

            Use a subtype

2.         Why is it important to identify and document business rules?           Mark for Review

(1) Points

            It allows you to create a complete data model and then check it for accuracy. (*)

            It allows you to improve the client's business.

            It ensures that the data model will automate all manual processes.

            None of the above

3.A new system would have a mixture of both Procedural and Structural Business Rules as part of the documentation of that new system. True or False?    Mark for Review

(1) Points

            True (*)

            False

4.         A business rule such as "All accounts must be paid in full within 10 days of billing" is best enforced by:       Mark for Review

(1) Points

            Creating additional programming code to identify and report accounts past due. (*)

            Making the relationship between CUSTOMER and PAYMENT fully mandatory and 1:1 on both sides.

            Making the payment attribute mandatory.

            Creating a message to be printed on every bill that reminds the customer to pay within ten days.

5.         How should you handle constraints that cannot be modeled on an ER diagram?     Mark for Review

(1) Points

            Always let the network architect handle them

            List them on a separate document to be handled programmatically (*)

            All constraints must be modeled and shown on the ER diagram

            Explain them to the users so they can enforce them

6.         Why is it important to identify and document structural rules?         Mark for Review

(1) Points

            Ensures we know what data to store and how that data works together. (*)

            Ensures nothing. There are no benefits to be gained from documenting your Structural Business Rules. We need to concentrate on the Procedural Business Rules only.

            Ensures we know what processes are in place and how to program them.

            All of the Above.

7.         How would you model a business rule that states that girls and boys may not attend classes together?            Mark for Review

(1) Points

            Supertype STUDENT has two subtypes BOY and GIRL which are related to GENDER, which is related to CLASS (*)

            Make the attribute Gender mandatory

            Make the attribute Gender optional

            Use a supertype

8.         A supertype can only have two subtypes and no more. True or False?          Mark for Review

(1) Points

            True

            False (*)

9.         All instances of the supertype must be an instance of one of the subtypes. True or False?   Mark for Review

(1) Points

            True (*)

            False

10.       A subtype is shown on an ERD as an entity with a one to many relationship to the supertype. True or False?  Mark for Review

(1) Points

            True

            False (*)

11.       Which of the following is true about subtypes?         Mark for Review

(1) Points

            Subtypes should not be exhaustive.

            Subtypes must not be mutually exclusive.

            Subtypes must be mutually exclusive. (*)

            One instance of a supertype may belong to two subtypes.

12.       You can only create relationships to a Supertype, not to a Subtype. True or False?  Mark for Review

(1) Points

            True

            False (*)

13.       A subtype can have a relationship not shared by the supertype. True or False?         Mark for Review

(1) Points

            True (*)

            False

14.       A Supertype can have only one subtype. True or False?        Mark for Review

(1) Points

            True

            False (*)

15.       All instances of a subtype must be an instance of the supertype. True or False?       Mark for Review

(1) Points

            True (*)

            False

1.         How would you model a business rule that states that girls and boys may not attend classes together?            Mark for Review

(1) Points

            Use a supertype

            Supertype STUDENT has two subtypes BOY and GIRL which are related to GENDER, which is related to CLASS (*)

            Make the attribute Gender optional

            Make the attribute Gender mandatory

2.         A business rule such as "We only ship goods after customers have completely paid any outstanding balances on their account" is best enforced by:          Mark for Review

(1) Points

            Making the payment attribute null.

            Creating additional programming code to verify no goods are shipped until the account has been settled in full. (*)

            We need to trust our customers, and we know they will pay some day.

            Making the payment attribute optional.

3.         A business rule such as "All accounts must be paid in full within 10 days of billing" is best enforced by:       Mark for Review

(1) Points

            Making the relationship between CUSTOMER and PAYMENT fully mandatory and 1:1 on both sides.

            Making the payment attribute mandatory.

            Creating a message to be printed on every bill that reminds the customer to pay within ten days.

            Creating additional programming code to identify and report accounts past due. (*)

4.         Can all constraints be modeled on an ER diagram?   Mark for Review

(1) Points

            No, and those that cannot be modeled should be listed on a separate document to be handled programmatically (*)

            No, in which case you should let the database administrator handle them

            Yes, all constraints must be modeled and shown on the ER diagram

            No, but you just explain them to the users so they can enforce them

5.         How would you model a business rule that states that on a student's birthday, he does not have to attend his classes?       Mark for Review

(1) Points

            Use a supertype

            You cannot model this. You need to document it (*)

            Make the attribute Birthdate mandatory

            Use a subtype

6.         A new system would have a mixture of both Procedural and Structural Business Rules as part of the documentation of that new system. True or False?    Mark for Review

(1) Points

            True (*)

            False

7.         Why is it important to identify and document business rules?           Mark for Review

(1) Points

            It allows you to create a complete data model and then check it for accuracy. (*)

            It allows you to improve the client's business.

            It ensures that the data model will automate all manual processes.

            None of the above

8.         All instances of a subtype may be an instance of the supertype but does not have to. True or False?            Mark for Review

(1) Points

            True

            False (*)

9.         A subtype can have a relationship not shared by the supertype. True or False?         Mark for Review

(1) Points

            True (*)

            False

10.       A subtype is shown on an ERD as an entity with a one to many relationship to the supertype. True or False?  Mark for Review

(1) Points

            True

            False (*)

11.       You can only create relationships to a Supertype, not to a Subtype. True or False?  Mark for Review

(1) Points

            True

            False (*)

12.       All ER diagrams must have one of each of the following: (Choose two)      Mark for Review

(1) Points

                                    (Choose all correct answers)  

            At least one supertype and subtype

            One or more Entities (*)

            Relationships between entities (*)

            Arcs

13.       Which of the following is true about subtypes?         Mark for Review

(1) Points

            Subtypes should not be exhaustive.

            Subtypes must be mutually exclusive. (*)

            Subtypes must not be mutually exclusive.

            One instance of a supertype may belong to two subtypes.

14.       A Supertype can have only one subtype. True or False?        Mark for Review

(1) Points

            True

            False (*)

15.       All instances of the supertype must be an instance of one of the subtypes. True or False?   Mark for Review

(1) Points

            True (*)

            False