7003ICT Database Management

7003ICT Database Management

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7003ICT Database Management

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7003ICT Database Management

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Course Code: 7003ICT
University: Griffith University

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Country: Australia

Question:

Correct identification of all the entities. Entity names should follow the standard conventions, i.e., they should be singular nouns and written in CAPITAL letters, or at least the first letter is CAPITAL.
Correct identification of all the attributes for each of the entities 8 marks Correct identification of all the relationships with appropriate cardinality and modality. If the cardinality and/or modality are not clear from the assignment specification, the assumptions made should be clearly stated.
Introduction of composite/bridge entity to represent many-to-many relationships. The relationship between language and country and that between driver and language should be identified as many-to-many.
Correct representation of strong and weak relationships (using solid and dashed line)
Correct identification of all the primary keys and foreign keys. The primary keys should be underlined and foreign keys should be italic.

Answer:

Assumptions
While developing the databases schema for the organization following assumptions are made in order to make the proposed database consistent one. Following are list of the assumptions;

Each of the productID, storeID, employeeID, inventoryID, deprtmentID will be unique for every new entry as they will be used as the primary as well as foreign keys among the tables.
A customer can be related to multiple number of stores as they can buy products from different stores situated at different locations.
Inventories will have a minimum reorder level for different products it stores.  This is important in order to maintain the availability of the products in the stores.
The pickup date of the products by the customers should not be ago than the arrival date of the product at the store.
Each employee can work under a certain department of a specific store.
For a specific store there will be only one store manager and similarly there will be only one supervisor for the specific department at a store.
The payslips for the employees in different stores will be generated fortnightly. Hence time between two payslips of an employee.
The store manager should be an employee of the store.
The order for the product cannot be placed which is not available in the inventory or under the reorder level.
As any customer can order more than one product or multiple number of same products thus the order table may contain multiple similar productsIDs related to a specific order and specific cutomerID.

Normalisation
 In order to normalize the tables determined for the database of the BigM stores the following instructions needs to considered  
 In order to make a table to 1 NF
 For 2NF
 The tables of the data base must be in the first normal form
All of the non-key attributes in the tables must be fully functionally dependent on primary key of the table.
And for 3NF
It is important that every non-prime attribute in the tables are non-transitively dependent on the key of the table.
For the store table
The table consisted of the of the following
1NF

storeid

storername

phonenumber

fax

Email

city

street_address

state

Postcode

2NF
3NF
For the Customer table

customernumber

firstname

lastname

customeraddress

phonenumber

Postaladdress

2NF
For the order table
1NF

OrderID

Customernumber

Productid

Storeid

OrderDate

Pickupdate

2NF
 For the Product table
1NF

productnumber

producttype

productdescription

productbrand

productsize

productprice

Productcategory

2NF
For the employee table

employeeid

firstname

lastname

Storeid

EmployeeAddress

Inventory table

inventoryid

productnumber

last_update

Storeid

Relational Database Schema
Store table

storeid

Integer

Primary key

 

storername

Varchar (15)

 

 

phonenumber

Integer

 

 

fax

Integer

 

 

Email

Varchar (50)

 

 

city

Varchar (20)

 

 

street_address

Varchar (25)

 

 

state

Varchar (15)

 

 

Postcode

Varchar (10)

 

 

Inventory table

inventoryid

Integer

Primary key

 

productnumber

Varchar (15)

 

 

last_update

Date

 

 

Storeid

Integer

 

 

 
Employee Table
 

employeeid

Integer

Primary key

 

firstname

Varchar (15)

 

 

lastname

Varchar (15)

 

 

EmployeeAddress

Varchar (100)

 

 

StoreID

Integer

Foreign key

Reference table Store table

Product table

productnumber

Integer

Primary key

 

producttype

Varchar (15)

 

 

productdescription

Varchar (70)

 

 

productbrand

Varchar (25)

 

 

productsize

Integer

 

 

productprice

Integer

 

 

productcategory

Varchar (15)

 

 

 

 

 

 

Order table

OrderID

Integer

Primary key

 

Customernumber

Integer

Foreign key

Customer table

Productid

Integer

 

 

Storeid

Integer

 

 

OrderDate

Date

 

 

Pickupdate

Date

 

 

 

 

 

 

 

 

 

 

Customer table

customernumber

Integer

 

 

firstname

Varchar (25)

 

 

lastname

Varchar (25)

 

 

State

Varchar (15)

 

 

City

Varchar (10)

 

 

street_address

Varchar (50)

 

 

Postcode

Varchar (25)

 

 

 

 

 

 

Department table

DepartmentID

Integer

 

 

Departmentname

Text

 

 

Storeid

Integer

 

 

ManagerID

Integer

Foreign key

Reference EmployeeID (employee table )

References
Coronel, C. and Morris, S., 2016. Database systems: design, implementation, & management. Cengage Learning.
Davie, B., Koponen, T., Pettit, J., Pfaff, B., Casado, M., Gude, N., Padmanabhan, A., Petty, T., Duda, K. and Chanda, A., 2017. A database approach to sdn control plane design. ACM SIGCOMM Computer Communication Review, 47(1), pp.15-26.
Elmasri, R. and Navathe, S., 2016. Fundamentals of database systems. London: Pearson.
Harrington, J.L., 2016. Relational database design and implementation. Morgan Kaufmann.
Jukic, N., Vrbsky, S. and Nestorov, S., 2016. Database systems: Introduction to databases and data warehouses. Prospect Press.
Köhler, H. and Link, S., 2018. SQL schema design: foundations, normal forms, and normalization. Information Systems, 76, pp.88-113.

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