Section 8 Quiz
(Answer
all questions in this section)
1. Which
of the following scenarios should be modeled so that historical data is kept?
(Choose two) Mark for Review
(1) Points
(Choose
all correct answers)
BABY
and AGE
CUSTOMER
and ORDERS (*)
TEACHER
and AGE
CUSTOMER
and PAYMENTS (*)
2. When
modeling historical data the unique identifier is always made up of a barred
relationship from the original two entities. True or False? Mark for Review
(1) Points
True
False
(*)
3. Which
of the following scenarios should be modeled so that historical data is kept?
(Choose two) Mark for Review
(1) Points
(Choose
all correct answers)
LIBRARY
and BOOK (*)
STUDENT
and GRADE (*)
STUDENT
and AGE
LIBRARY
and NUMBER OF BOOKS
4. Which
of the following statements are true for ERD's to enhance their readability.
(Choose Two) Mark for Review
(1) Points
(Choose
all correct answers)
You
must ensure that you have every single entity--even if hundreds of them
exist--on one single, big diagram.
The
crows feet (many ends) can point whichever way is the easiest to draw.
Avoid
crossing one relationship line with another. (*)
It
is OK to break down a large ERD into subsets of the overall picture. By doing
so, you end up with more than one ERD that, taken together, documents the
entire system. (*)
5. No
formal rules exist for drawing ERD's. The most important thing is to make sure
that all entities, attributes, and relationships are documented on the diagram,
and the diagram is clear and readable. True or False? Mark for Review
(1) Points
True
(*)
False
6. You
must make sure all entities of a proposed system can fit onto one diagram. It
is not allowed to break up a data model into more than one diagram. True or
False? Mark for Review
(1) Points
True
False
(*)
7. Formal rules exist for drawing ERD's. You must always
follow them, even if it results in an ERD that is difficult to read. True or
False? Mark for Review
(1) Points
True
False
(*)
8. All
systems must include functionality to provide logging or journaling in
conceptual data models. True or False?
Mark for Review
(1) Points
True
False
(*)
9. Which
of the following is a logical constraint that could result from considering how
time impacts an example of data storage?
Mark for Review
(1) Points
End
Date must be before the Start Date.
EMPLOYEE
periods can overlap causing the database to crash.
Dates
must be stored with Time.
An
ASSIGNMENT may only refer to an EMPLOYEE with a valid employee record at the
Start Date of the ASSIGNMENT. (*)
10. What is the function of logging or
journaling in conceptual data models?
Mark for Review
(1) Points
Represents
entities as time in the data model.
Creates
a fixed time for all events in a data model.
Gives
a timestamp to all entities.
Allows
you to track the history of attribute values, relationships, and/or entire
entities (*)
11. How do you know when to use the
different types of time in your design?
Mark for Review
(1) Points
It
depends on the functional needs of the system . (*)
Always
model time; you can take it out later if it is not needed.
You
would first determine the existence of the concept of time and map it against
the Greenwich Mean Time.
The
rules are fixed and should be followed.
12. Which of the following would be a
logical constraint when modeling time for a country entity? Mark for Review
(1) Points
If
you are doing a system for France or Germany, you would need security
clearance.
Daily
traffic patterns must be monitored to determine which countries are
overcrowded.
Countries
may change their names and/or borders over a period of time. (*)
People
have births and deaths in their countries that must be tracked by the system.
13. In a payroll system, it is desirable to
have an entity called DAY with a holiday attribute when you want to track
special holiday dates. True or False?
Mark for Review
(1) Points
True
(*)
False
14. Modeling historical data is optional.
True or False? Mark for Review
(1) Points
True
(*)
False
15. When a relationship may or may not be
transferable, depending on time, this is know as a/an: Mark for Review
(1) Points
Transferable
Relationship
Non-transferable
Relationship.
Conditional
Non-transferable Relationship. (*)
Arc.
1. You
must make sure all entities of a proposed system can fit onto one diagram. It
is not allowed to break up a data model into more than one diagram. True or
False? Mark for Review
(1) Points
True
False
(*)
2. Which
of the following statements are true for ERD's to enhance their readability.
(Choose Two) Mark for Review
(1) Points
(Choose
all correct answers)
You
must ensure that you have every single entity--even if hundreds of them
exist--on one single, big diagram.
It
is OK to break down a large ERD into subsets of the overall picture. By doing
so, you end up with more than one ERD that, taken together, documents the
entire system. (*)
The
crows feet (many ends) can point whichever way is the easiest to draw.
Avoid
crossing one relationship line with another. (*)
3. In an
ERD, it is a good idea to group your entities according to the expected
volumes. By grouping high volume entities together, the diagrams could become
easier to read. True or False? Mark
for Review
(1) Points
True
(*)
False
4. There
is no point in trying to group your entities together on your diagram according
to volume, and making a diagram look nice is a waste of time. True or False? Mark for Review
(1) Points
True
False
(*)
5. Which
of the following scenarios should be modeled so that historical data is kept?
(Choose two) Mark for Review
(1) Points
(Choose
all correct answers)
CUSTOMER
and ORDERS (*)
CUSTOMER
and PAYMENTS (*)
TEACHER
and AGE
BABY
and AGE
6. Which
of the following scenarios should be modeled so that historical data is kept?
(Choose two) Mark for Review
(1) Points
(Choose
all correct answers)
LIBRARY
and NUMBER OF BOOKS
STUDENT
and GRADE (*)
LIBRARY
and BOOK (*)
STUDENT
and AGE
7. Modeling
historical data can produce a unique identifier that includes a date. True or
False? Mark for Review
(1) Points
True
(*)
False
8. In a
payroll system, it is desirable to have an entity called DAY with a holiday
attribute when you want to track special holiday dates. True or False? Mark for Review
(1) Points
True
(*)
False
9. Which
of the following would be a logical constraint when modeling time for a City
entity? Mark for Review
(1) Points
If
you are doing a system for any French City, you would need security clearance.
People
are born in the city and people die in the city.
Daily
traffic patterns must be monitored to determine how many law enforcement
officers are needed.
Cites
may change their names and/or country association if the borders of a country
change. (*)
10. When you add the concept of time to your
data model, your model becomes more complex. True or False? Mark for Review
(1) Points
True
(*)
False
11. If you have an entity with a DATE
attribute, in addition to other attributes that track date characteristics, you
should create a DAY entity. True or False?
Mark for Review
(1) Points
True
(*)
False
12. There are no circumstances where you
would create a DAY entity. True or False?
Mark for Review
(1) Points
True
False
(*)
13. You are doing a data model for a
computer sales company where the price of postage depends upon the day of the
week that goods are shipped. So shipping is more expensive if the customer
wants a delivery to take place on a Saturday or Sunday. What would be the best
way to model this? Mark for
Review
(1) Points
Email
current prices to all employees whenever a price changes.
Update
the prices in the system, print out the current prices when they change, and
pin them on the company noticeboard.
Allow
them to enter whatever delivery charge they want.
Use
a Delivery Day entity, which holds prices against week days, and ensure the we
also have an attribute for the Requested Delivery Day in the Order Entity. (*)
14. Why would you want to model a time
component when designing a system that lets people buy bars of gold? Mark for Review
(1) Points
The
Government of your country might want to be notified of this transaction.
You
would not want to model this; it is not important.
The
price of gold fluctuates and, to determine the current price, you need to know
the time of purchase. (*)
Sales
people must determine where the gold is coming from.
15. All systems must include functionality
to provide logging or journaling in conceptual data models. True or False? Mark for Review
(1) Points
True
False
(*)
1. Which
of the following scenarios should be modeled so that historical data is kept?
(Choose two) Mark for Review
(1) Points
(Choose
all correct answers)
LIBRARY
and BOOK (*)
STUDENT
and AGE
LIBRARY
and NUMBER OF BOOKS
STUDENT
and GRADE (*)
2. When
modeling historical data the unique identifier is always made up of a barred
relationship from the original two entities. True or False? Mark for Review
(1) Points
True
False
(*)
3. Which of
the following scenarios should be modeled so that historical data is kept?
(Choose two) Mark for Review
(1) Points
(Choose
all correct answers)
CUSTOMER
and PAYMENTS (*)
CUSTOMER
and ORDERS (*)
BABY
and AGE
TEACHER
and AGE
4. When a
relationship may or may not be transferable, depending on time, this is know as
a/an: Mark for Review
(1) Points
Transferable
Relationship
Non-transferable
Relationship.
Conditional
Non-transferable Relationship. (*)
Arc.
5. All
systems must have an entity called WEEK with a holiday attribute, so you know
when to give your employees a holiday. True or False? Mark for Review
(1) Points
True
False
(*)
6. In a
payroll system, it is desirable to have an entity called DAY with a holiday
attribute when you want to track special holiday dates. True or False? Mark for Review
(1) Points
True
(*)
False
7. When
you add the concept of time to your data model, your model becomes more
complex. True or False?
Mark for Review
(1) Points
True
(*)
False
8. If you
have an entity that a DATE attribute, and other attributes that track
characteristics of the date, you should create a DAY entity. True or False? Mark for Review
(1) Points
True
(*)
False
9. In an
ERD, it is a good idea to group your entities according to the expected
volumes. By grouping high volume entities together, the diagrams could become
easier to read. True or False? Mark
for Review
(1) Points
True
(*)
False
10. There
is no point in trying to group your entities together on your diagram according
to volume, and making a diagram look nice is a waste of time. True or False? Mark for Review
(1) Points
True
False
(*)
11. No
formal rules exist for drawing ERD's. The most important thing is to make sure
that all entities, attributes, and relationships are documented on the diagram,
and the diagram is clear and readable. True or False? Mark for Review
(1) Points
True
(*)
False
12. In an
ERD, High Volume Entities usually have very few relationships to other
entities. True or False? Mark for
Review
(1) Points
True
False
(*)
13. You are
doing a data model for a computer sales company where the price of postage
depends upon the day of the week that goods are shipped. So shipping is more
expensive if the customer wants a delivery to take place on a Saturday or
Sunday. What would be the best way to model this? Mark for Review
(1) Points
Email
current prices to all employees whenever a price changes.
Update
the prices in the system, print out the current prices when they change, and
pin them on the company noticeboard.
Use
a Delivery Day entity, which holds prices against week days, and ensure the we
also have an attribute for the Requested Delivery Day in the Order Entity. (*)
Allow
them to enter whatever delivery charge they want.
14. Which
of the following is a logical constraint that could result from considering how
time impacts an example of data storage?
Mark for Review
(1) Points
EMPLOYEE
periods can overlap causing the database to crash.
Dates
must be stored with Time.
End
Date must be before the Start Date.
An
ASSIGNMENT may only refer to an EMPLOYEE with a valid employee record at the
Start Date of the ASSIGNMENT. (*)
15. Why
would you want to model a time component when designing a system that lets
people buy bars of gold? Mark for
Review
(1) Points
You
would not want to model this; it is not important.
The
Government of your country might want to be notified of this transaction.
The
price of gold fluctuates and, to determine the current price, you need to know
the time of purchase. (*)
Sales
people must determine where the gold is coming from.
1. You
are doing a data model for a computer sales company where the price fluctuates
on a regular basis. If you want to allow the company to modify the price and
keep track of the changes, what is the best way to model this? Mark for Review
(1) Points
A.
Create a product entity and a related price entity with start and end dates,
and then let the users enter the new price whenever required.
B.
Create a new item and a new price every day.
C.
Use a price entity with a start and end date
D.
Allow them to delete the item and enter a new one.
E.
Both A and C (*)
2. Which
of the following is a logical constraint that could result from considering how
time impacts an example of data storage?
Mark for Review
(1) Points
An
ASSIGNMENT may only refer to an EMPLOYEE with a valid employee record at the
Start Date of the ASSIGNMENT. (*)
Dates
must be stored with Time.
End
Date must be before the Start Date.
EMPLOYEE
periods can overlap causing the database to crash.
3. You
are doing a data model for a computer sales company where the price of postage
depends upon the day of the week that goods are shipped. So shipping is more
expensive if the customer wants a delivery to take place on a Saturday or
Sunday. What would be the best way to model this? Mark for Review
(1) Points
Update
the prices in the system, print out the current prices when they change, and
pin them on the company noticeboard.
Use
a Delivery Day entity, which holds prices against week days, and ensure the we
also have an attribute for the Requested Delivery Day in the Order Entity. (*)
Email
current prices to all employees whenever a price changes.
Allow
them to enter whatever delivery charge they want.
4. Historical data must never be kept. True or False? Mark for Review
(1) Points
True
False
(*)
5. Modeling
historical data can produce a unique identifier that includes a date. True or
False? Mark for Review
(1) Points
True
(*)
False
6. Which
of the following scenarios should be modeled so that historical data is kept?
(Choose two) Mark for Review
(1) Points
(Choose
all correct answers)
BABY
and AGE
TEACHER
and AGE
CUSTOMER
and ORDERS (*)
CUSTOMER
and PAYMENTS (*)
7. In an
ERD, High Volume Entities usually have very few relationships to other
entities. True or False? Mark for
Review
(1) Points
True
False
(*)
8. No
formal rules exist for drawing ERD's. The most important thing is to make sure
that all entities, attributes, and relationships are documented on the diagram,
and the diagram is clear and readable. True or False? Mark for Review
(1) Points
True
(*)
False
9. Formal
rules exist for drawing ERD's. You must always follow them, even if it results
in an ERD that is difficult to read. True or False? Mark for Review
(1) Points
True
False
(*)
10. Which of the following statements are
true to enhance the readability of ERDs? (Choose Two) Mark for Review
(1) Points
(Choose
all correct answers)
Crossing
relationship lines help the readability of the diagram.
Crows
feet (the many-ends of relationships) should consistently point the same
direction where possible, either South & East or North & West (*)
Relationship
lines should not cross. (*)
It
does not matter which way the crows feet (many ends of a relationship) point.
11. Modeling historical data is optional.
True or False? Mark for Review
(1) Points
True
(*)
False
12. When a relationship may or may not be
transferable, depending on time, this is know as a/an: Mark for Review
(1) Points
Conditional
Non-transferable Relationship. (*)
Arc.
Transferable
Relationship
Non-transferable
Relationship.
13. When you add the concept of time to your
data model, your model becomes more complex. True or False? Mark for Review
(1) Points
True
(*)
False
14. All systems must have an entity called
WEEK with a holiday attribute so that you know when to give employees a
holiday. True or False? Mark for
Review
(1) Points
True
False
(*)
15. How do you know when to use the
different types of time in your design?
Mark for Review
(1) Points
You
would first determine the existence of the concept of time and map it against
the Greenwich Mean Time.
The rules
are fixed and should be followed.
Always
model time; you can take it out later if it is not needed.
It
depends on the functional needs of the system . (*)
1. Which
of the following scenarios should be modeled so that historical data is kept?
(Choose two) Mark for Review
(1) Points
(Choose
all correct answers)
STUDENT
and GRADE (*)
STUDENT
and AGE
LIBRARY
and BOOK (*)
LIBRARY
and NUMBER OF BOOKS
2. When
modeling historical data the unique identifier is always made up of a barred relationship
from the original two entities. True or False?
Mark for Review
(1) Points
True
False
(*)
3. Modeling
historical data can produce a unique identifier that includes a date. True or
False? Mark for Review
(1) Points
True
(*)
False
4. All
systems must include functionality to provide logging or journaling in
conceptual data models. True or False?
Mark for Review
(1) Points
True
False
(*)
5. You
are doing a data model for a computer sales company where the price fluctuates
on a regular basis. If you want to allow the company to modify the price and
keep track of the changes, what is the best way to model this? Mark for Review
(1) Points
A.
Create a product entity and a related price entity with start and end dates,
and then let the users enter the new price whenever required.
B.
Create a new item and a new price every day.
C.
Use a price entity with a start and end date
D.
Allow them to delete the item and enter a new one.
E.
Both A and C (*)
6. Which
of the following is a logical constraint that could result from considering how
time impacts an example of data storage?
Mark for Review
(1) Points
End
Date must be before the Start Date.
EMPLOYEE
periods can overlap causing the database to crash.
An
ASSIGNMENT may only refer to an EMPLOYEE with a valid employee record at the
Start Date of the ASSIGNMENT. (*)
Dates
must be stored with Time.
7. Formal
rules exist for drawing ERD's. You must always follow them, even if it results
in an ERD that is difficult to read. True or False? Mark for Review
(1) Points
True
False
(*)
8. In an
ERD, High Volume Entities usually have very few relationships to other
entities. True or False? Mark for
Review
(1) Points
True
False
(*)
9. In an
ERD, it is a good idea to group your entities according to the expected
volumes. By grouping high volume entities together, the diagrams could become
easier to read. True or False? Mark
for Review
(1) Points
True
(*)
False
10. No formal rules exist for drawing ERD's.
The most important thing is to make sure that all entities, attributes, and
relationships are documented on the diagram, and the diagram is clear and
readable. True or False?
Mark for Review
(1) Points
True
(*)
False
11. How do you know when to use the
different types of time in your design?
Mark for Review
(1) Points
You
would first determine the existence of the concept of time and map it against
the Greenwich Mean Time.
Always
model time; you can take it out later if it is not needed.
The
rules are fixed and should be followed.
It
depends on the functional needs of the system . (*)
12. All systems must have an entity called
WEEK with a holiday attribute so that you know when to give employees a
holiday. True or False? Mark for
Review
(1) Points
True
False
(*)
13. When a relationship may or may not be
transferable, depending on time, this is know as a/an: Mark for Review
(1) Points
Conditional
Non-transferable Relationship. (*)
Transferable
Relationship
Non-transferable
Relationship.
Arc.
14. Which of the following would be a
logical constraint when modeling time for a country entity? Mark for Review
(1) Points
Daily
traffic patterns must be monitored to determine which countries are
overcrowded.
Countries
may change their names and/or borders over a period of time. (*)
People
have births and deaths in their countries that must be tracked by the system.
If
you are doing a system for France or Germany, you would need security
clearance.
15. Which of the following would be a
logical constraint when modeling time for a City entity? Mark for Review
(1) Points
Cites
may change their names and/or country association if the borders of a country
change. (*)
Daily
traffic patterns must be monitored to determine how many law enforcement
officers are needed.
People
are born in the city and people die in the city.
If
you are doing a system for any French City, you would need security clearance.
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BalasHapusTrue
False (*)
Conditional non-transferability refers to a relationship that may or may not be transferable, depending on time. True or False?
True (*)
False
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When a system requires that old values for attributes are kept on record, this is know as Journaling or Logging. True or False?
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True (*)
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