Question 3Tshepo has put a lot of thought into the data that he wants to store in the carbon accounting database. He has also spoken to the CEOs of a number of companies in the group to get their inputs. Between them, they have come up with a set of business rules to be used as the basis for the data model design.Draw an entity relationship diagram (ERD) in Unified Modelling Language (UML) notation according to these business rules. Marks will be awarded as follows: Project ACME Green – Business Rules1. A single database will be created that will track the carbon footprints? of all the companieswithin the ACME Technologies group.2.All tables in the database must have surrogate primary keys.3.Each company has a name and consists of one or more departments.4.Each company has one employee that is the CEO of the company. That employee may onlybe the CEO of one company, and not all employees are CEOS.5.Each department must have exactly one employee who is the Green Champion – theperson responsible for any initiatives related to the carbon footprint of the department.That employee may only be the Green Champion for a single department, and not allemployees are Green Champions.6.The following data must be recorded for each employee: name and surname.7.Some departments have products that they are responsible for. Each product must beallocated to exactly one department, and must have a description.8. The main purpose of the database is to record carbon transactions. Each carbontransaction is accounted for by exactly one department. Optionally, the single productthat the carbon transaction relates to can also be recorded.9. The following data must be recorded for each carbon transaction: date and value.

There are 6 Entity : 1.Company 2. CEO 3. Department 4. Employee 5. Product 6. Carbon Transaction…

Answered: Question 3 Tshepo has put a lot of…

Database Systems: Design, Implementation, & Management

11th Edition

ISBN:9781285196145

Author:Steven, Steven Morris, Carlos Coronel, Carlos, Coronel, Carlos; Morris, Carlos Coronel and Steven Morris, Carlos Coronel; Steven Morris, Steven Morris; Carlos Coronel

Publisher:Steven, Steven Morris, Carlos Coronel, Carlos, Coronel, Carlos; Morris, Carlos Coronel and Steven Morris, Carlos Coronel; Steven Morris, Steven Morris; Carlos Coronel

Chapter4: Entity Relationship (er) Modeling

Section: Chapter Questions

Problem 21RQ

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Question 3

Tshepo has put a lot of thought into the data that he wants to store in the carbon accounting database. He has also spoken to the CEOs of a number of companies in the group to get their inputs. Between them, they have come up with a set of business rules to be used as the basis for the data model design.

Draw an entity relationship diagram (ERD) in Unified Modelling Language (UML) notation according to these business rules. Marks will be awarded as follows:

Project ACME Green – Business Rules
1. A single database will be created that will track the carbon footprints? of all the companies
within the ACME Technologies group.
2.
All tables in the database must have surrogate primary keys.
3.
Each company has a name and consists of one or more departments.
4.
Each company has one employee that is the CEO of the company. That employee may only
be the CEO of one company, and not all employees are CEOS.
5.
Each department must have exactly one employee who is the Green Champion – the
person responsible for any initiatives related to the carbon footprint of the department.
That employee may only be the Green Champion for a single department, and not all
employees are Green Champions.
6.
The following data must be recorded for each employee: name and surname.
7.
Some departments have products that they are responsible for. Each product must be
allocated to exactly one department, and must have a description.
8. The main purpose of the database is to record carbon transactions. Each carbon
transaction is accounted for by exactly one department. Optionally, the single product
that the carbon transaction relates to can also be recorded.
9. The following data must be recorded for each carbon transaction: date and value.

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Follow-up Question

sorry but are you really an "expert"? do you really have a master's or a doctorate? because it's very weird to answer off the mark each time honestly, it's level L2

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Follow-up Question

Solution incorrect. CEO is not an entity and you missed GreenChampion

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Follow-up Question

Hello,

If GreenChampion is not an entity, why someone told me this ?

Thank you

Company
Company - v
location
Contact
1
has
1
CEO
nain
C-ID
Name
Phone
Email
1.
1
Courists
has
Department
1* Dept-ID
Dept_name
location
1 *
has
1
Employee
E-ID
1 Naume
Phone No.
Email
Surname
accounted
for
1
work on
Carbon
Transcation
Trans-ID
date
Value
Product
Prod-ID
Quantity
Decoration
171 Green
champio
has
sion
Emp-1
●Dept_crame
hame

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Follow-up Question

Hello,

Can you tell me if for this exercise, there are 6 or 7 entities? and if, tell me why? Because someone told me that GreenChampion is an entity but I'm not sure about that.

I wanted to know also, why we don't connect carbon transaction with product with the verb "recorded" since the sentence said that : 'Optionally, the single product that the carbon transaction relates to can also be recorded'.

Thank you.

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Follow-up Question

Sorry but I don't understand your explication. in the solution, you say that CEO is an entity and now you say the opposite? I do not understand??

Je ne vois rien à propos du GreenChampion.

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Follow-up Question

I don't understand why CEO is an entity? For me, we link company to employee by the relation "composed" and composed has a CEO name which is an attribute of the relation.

And why there is nothing about GreenChampion?

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Follow-up Question

Hello, why on the diagram there are no associations or cardinalities?

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