Answer the following questions about the given statement: ∀t : Trainer • ∃c : course • (t,c) ∈ Teaches •What does this statement mean? •Is this statement a set or a predicate? •What does the statement evaluate to based on the current system state?
Answer the following questions about the given statement: ∀t : Trainer • ∃c : course • (t,c) ∈ Teaches •What does this statement mean? •Is this statement a set or a predicate? •What does the statement evaluate to based on the current system state?
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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Question
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Answer the following questions about the given statement:
∀t : Trainer • ∃c : course • (t,c) ∈ Teaches
•What does this statement mean?
•Is this statement a set or a predicate?
•What does the statement evaluate to based on the current system state?
![This is for assignmnet 4, the Owner-Course, Trainer-Course association we name "Teaches" here to keep it simpler.
Teaches association between Owner/Teacher and Course
Gym Owner : Owner
name = GymOwner
email gymowner@gym.com
password
= gymowner
Trainer 1: Trainer
name = Trainer1
email trainer1@gym.com
password = trainer 1
credit = 3
Trainer 2 Trainer
name = Trainer2
email trainer2@gym.com
password = trainer2
credit = 2
Wrestling Course
time = 2
type =
id = 1
private
Wrestling
false
Boxing Course
time = 2
type =
id = 2
private false
Boxing
WeightLifting Course
time = 2
type = Weightlifting
id = 3
private = false
Yogal: Course
time = 3
type
=
id = 4
private = true
Yoga
Yoga2 Course
time = 4
=
type
id = 5
private = false
Yoga
Customer 1: Customer
Customer1
name =
email = customer1@gym.com
password = customer1
classcredit
class credit 0
Customer 2 : Customer
name = Customer2
email
password = customer2
classcredit
class credit = 1
=
customer2@gym.com
Customer 3 : Customer
name = Customer3
email = customer3@gym.com
= customer3
password
classcredit
class credit = 4
Customer 4 : Customer
name = Customer4
email = customer4@gym.com
password = customer4
classcredit
class credit = 5
Customer 5 Customer
name = Customer5
email =
password = customer5
classcredit
class credit = 1
customer5@gym.com
Customer 6 : Customer
name = Customer6
email
password = customer6
classcredit
class credit = 10
=
customer6@gym.com
Customer 7 : Customer
Books association between Course and Customer
name = Customer7
email =
customer7@gym.com
password = customer7
classcredit
class credit = 2](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fcede8746-e52f-4eaf-bfc2-0cf286297e7e%2F289c6bc7-6d9a-4d21-b291-4e1199700646%2Fs14wssj_processed.png&w=3840&q=75)
Transcribed Image Text:This is for assignmnet 4, the Owner-Course, Trainer-Course association we name "Teaches" here to keep it simpler.
Teaches association between Owner/Teacher and Course
Gym Owner : Owner
name = GymOwner
email gymowner@gym.com
password
= gymowner
Trainer 1: Trainer
name = Trainer1
email trainer1@gym.com
password = trainer 1
credit = 3
Trainer 2 Trainer
name = Trainer2
email trainer2@gym.com
password = trainer2
credit = 2
Wrestling Course
time = 2
type =
id = 1
private
Wrestling
false
Boxing Course
time = 2
type =
id = 2
private false
Boxing
WeightLifting Course
time = 2
type = Weightlifting
id = 3
private = false
Yogal: Course
time = 3
type
=
id = 4
private = true
Yoga
Yoga2 Course
time = 4
=
type
id = 5
private = false
Yoga
Customer 1: Customer
Customer1
name =
email = customer1@gym.com
password = customer1
classcredit
class credit 0
Customer 2 : Customer
name = Customer2
email
password = customer2
classcredit
class credit = 1
=
customer2@gym.com
Customer 3 : Customer
name = Customer3
email = customer3@gym.com
= customer3
password
classcredit
class credit = 4
Customer 4 : Customer
name = Customer4
email = customer4@gym.com
password = customer4
classcredit
class credit = 5
Customer 5 Customer
name = Customer5
email =
password = customer5
classcredit
class credit = 1
customer5@gym.com
Customer 6 : Customer
name = Customer6
email
password = customer6
classcredit
class credit = 10
=
customer6@gym.com
Customer 7 : Customer
Books association between Course and Customer
name = Customer7
email =
customer7@gym.com
password = customer7
classcredit
class credit = 2
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