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Infant. Stuffed Animal. Aubrey. s1. has-as-favorite. s2. Brooks. Robby. Min. Max. Min. Max. An infant can choose only one favorite stuffed animal.

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Infant

Stuffed Animal

Aubrey

s1

has-as-favorite

s2

Brooks

Robby

Min

Max

Min

Max

  • An infant can choose only one favorite stuffed animal.

  •  The same stuffed animal can be chosen as favorite by more than one infant. For example, both Aubrey and Brooks have chosen the same stuffed animal (s1) as their favorite.

  • No infant has chosen s2 as favorite stuffed animal.

  • Robby has not chosen a favorite stuffed animal yet.

Group _______

Group _______

Problem #1

Problem #2

Problem #2


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Infant

Stuffed Animal

Aubrey

s1

has-as-favorite

s2

Brooks

Robby

0

1

0

N

Min

Max

Min

Max

  • An infant can choose only one favorite stuffed animal.

  •  The same stuffed animal can be chosen as favorite by more than one infant. For example, both Aubrey and Brooks have chosen the same stuffed animal (s1) as their favorite.

  • No infant has chosen s2 as favorite stuffed animal.

  • Robby has not chosen a favorite stuffed animal yet.

Group _______

Problem #1 -- Solution

Problem #2

Problem #2


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Parent

Child

Min

Max

Min

Max

Group _______

Problem #2


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1. Being a parent implies that you have one or more children.

2. All children have 2 parents.

Parent

Child

Group _______

Problem #2


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Parent

Child

1

N

1

N

Min

Max

Min

Max

Problem #2 -- Solution


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  • Here are our payment policies: children.

  • Customers must pay no later than 60 days after shipment.

  • We allow installments.

  • All cash receipts come from sales; i.e. we need to record a sale/shipment for each cash receipt.

  • The same cash receipt can pay for multiple sales/shipments.

Sale/

Shipment

Cash

Receipt

Min

Max

Min

Max

Group _______

Group _______

Problem #5

Problem #3


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  • Here are our payment policies: children.

  • Customers must pay no later than 60 days after shipment.

  • We allow installments.

  • All cash receipts come from sales; i.e. we need to record a sale/shipment for each cash receipt.

  • The same cash receipt can pay for multiple sales/shipments.

Sale/

Shipment

Cash

Receipt

0

N

1

N

Min

Max

Min

Max

Group _______

Problem #5

Problem #3 -- Solution


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Customers either order from us using the Internet (our Website) or pick up goods from our store (there is no order). A sale occurs when (1) we ship the goods, or (2) a customers picks up goods from our store.

For orders placed through our website, it usually takes us 48 hours to ship the goods to the customers (and thus to fulfill the order).

We often use partial shipments – we ship what we have now and then ship the rest of the order later (when it becomes available).

There is no order when customers pick up goods from our store (a sale).

To save money, we try to execute (fulfill) multiple orders with one shipment.

Order

Sale/Shipment

Delivery

Min

Max

Min

Max

Group _______

Problem #4


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Customers either order from us using the Internet (our Website) or pick up goods from our store (there is no order). A sale occurs when (1) we ship the goods, or (2) a customers picks up goods from our store.

For orders placed through our website, it usually takes us 48 hours to ship the goods to the customers (and thus to fulfill the order).

We often use partial shipments – we ship what we have now and then ship the rest of the order later (when it becomes available).

There is no order when customers pick up goods from our store (a sale).

To save money, we try to execute (fulfill) multiple orders with one shipment.

Order

Sale/Shipment

0

N

0

N

Delivery

Min

Max

Min

Max

Problem #4 -- Solution


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Monica owes a store that sells stuffed animals. She records all her customers and items (stuffed animals) in a database. She currently has more than 350 customers; all of them are recorded in the database. She currently sells 486 different items; all of them are recorded in the database. Further, for her 25 most important customers (“Club 25”) she keeps a list of their 5 favorite items. She uses that information to send gifts (birthday, wedding, etc.). An item can be the favorite item for more than one “Club 25” member.

Club 25

Customer

Item

Min

Max

Min

Max

Group _______

Problem #5


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Monica has a store that sells stuffed animals. She records all her customers and items (stuffed animals) in a database. She currently has more than 350 customers; all of them are recorded in the database. She currently sells 486 different items; all of them are recorded in the database. Further, for her 25 most important customers (“Club 25”) she keeps a list of their 5 favorite items. She uses that information to send gifts (birthday, wedding, etc.). An item can be the favorite item for more than one “Club 25” member.

Club 25

Customer

Item

0

N

0

N

Min

Max

Min

Max

Group _______

Problem #5 – Solution


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  • UD organizes 10 “emerging issues” seminars each semester. Students are required to attend at least three of the seminars. Enrollment is limited to thirty students per seminar. For seminars that are full, students can put themselves on a waiting list.

  • The IFRS seminar is full; i.e., thirty students are enrolled.

  • We received our first enrollment thirty minutes after we opened the (IFRS) seminar for enrolment (and thus thirty minutes after we recorded the seminar in the database).

  • Actually, we have already five students on the waiting list for this seminar.

  • The “Continuous Auditing” seminar is less popular. We have only fifteen enrollments thus far. Obviously, nobody is currently on the waiting list for the “Continuous Auditing” seminar.

  • One of our students, Jimmy Hunton, is enrolled in all ten seminars! However, Julie Dunn, another student, is on the waiting list of two seminars (including the IFRS one), but is not enrolled in any seminar yet. Still better than Graham Gerard who has not enrolled for any of the seminars and is not on any waiting list. He is in big trouble!

MAX

MAX

MIN

MIN

enrolled_in

STUDENT

SEMINAR

on_the_waiting_list_of

MIN

MIN

MAX

MAX

Define the cardinalities

Group _______

Problem #8

Group _______

Problem #6


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  • UD organizes 10 “emerging issues” seminars each semester. Students are required to attend at least three of the seminars. Enrollment is limited to thirty students per seminar. For seminars that are full, students can put themselves on a waiting list.

  • The IFRS seminar is full; i.e., thirty students are enrolled.

  • We received our first enrollment thirty minutes after we opened the (IFRS) seminar for enrolment (and thus thirty minutes after we recorded the seminar in the database).

  • Actually, we have already five students on the waiting list for this seminar.

  • The “Continuous Auditing” seminar is less popular. We have only fifteen enrollments thus far. Obviously, nobody is currently on the waiting list for the “Continuous Auditing” seminar.

  • One of our students, Jimmy Hunton, is enrolled in all ten seminars! However, Julie Dunn, another student, is on the waiting list of two seminars (including the IFRS one), but is not enrolled in any seminar yet. Still better than Graham Gerard who has not enrolled for any of the seminars and is not on any waiting list. He is in big trouble!

N

N

MAX

MAX

0

0

MIN

MIN

enrolled_in

STUDENT

SEMINAR

on_the_waiting_list_of

0

0

MIN

MIN

N

N

MAX

MAX

Define the cardinalities

Group _______

Problem #8

Problem #6 -- Solution


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This year, the NBA hands out their first “MVP-P” award –only NBA players can vote for this award. All NBA players are asked to mail their vote by May 1st. Players don’t have to vote. The rules are simple: (1) you can’t vote for yourself, and (2) you can vote for one player only. The player with the most votes will be given the award. Obviously, only a select group of players will receive votes; i.e., many players will receive zero (0) votes. Note – we need to record all NBA players in our database even when they don’t vote.

(NBA)

Player

Min

Min

Max

Max

votes_for

received_vote_from

Group _______

Problem #7


Slide15 l.jpg

This year, the NBA hands out their first “MVP-P” award –only NBA players can vote for this award. All NBA players are asked to mail their vote by May 1st. Players don’t have to vote. The rules are simple: (1) you can’t vote for yourself, and (2) you can vote for one player only. The player with the most votes will be given the award. Obviously, only a select group of players will receive votes; i.e., many players will receive zero (0) votes. Note – we need to record all NBA players in our database even when they don’t vote.

(NBA)

Player

Min

0

0

Min

Max

1

N

Max

votes_for

received_vote_from

Problem #7 -- Solution


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