Database Modelling Assignment Help

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KC7013 Database Modelling Assignment

Mapping to Programme Goals and Objectives - This assignment covers the following learning outcomes for the module:

A. Knowledge & Understanding:

LO1. Key data modelling concepts, application of database theory, principles for supporting business and information systems.

Answer: Data modeling is a fundamental aspect of database design, involving the representation of data structures and relationships. Key concepts include entities, attributes, and relationships, which form the basis of a data model. Database theory provides the theoretical underpinnings for data modeling, encompassing concepts like normalization, which ensures data integrity and efficiency. By applying these principles, data models can be designed to effectively support business and information systems. These models serve as blueprints for database implementation, ensuring that data is stored, accessed, and managed in a structured and efficient manner, thereby enabling organizations to make informed decisions and drive business success.

B. Intellectual / Professional skills & abilities:

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LO1. Conceptual data modelling, relational database design and implementation in SQL & PL/SQL, and object-based databases.

Answer: Conceptual data modeling involves creating a high-level representation of an organization's data, typically using Entity-Relationship (ER) diagrams. This model serves as a blueprint for subsequent design phases. Relational database design involves translating the conceptual model into a relational database structure, using tables, columns, and primary/foreign keys to represent entities, attributes, and relationships. SQL and PL/SQL are programming languages used to interact with relational databases, allowing for data manipulation, query execution, and procedural programming. Object-based databases, on the other hand, store data in objects, which encapsulate both data and behavior. They are often used in applications that require complex data structures and relationships, such as geographic information systems or multimedia databases.

C. Personal Values Attributes (Global / Cultural awareness, Ethics, Curiosity) (PVA):

LO1.  Realise the responsibilities of database designers with respect to professional, legal, security and ethical issues.

Answer: Database designers bear significant responsibilities in ensuring the integrity, security, and ethical use of data. Professionally, they must adhere to industry standards and best practices, such as normalization and data governance. Legally, they are accountable for complying with data privacy regulations like GDPR and CCPA, safeguarding sensitive information. Security is paramount, requiring them to implement robust measures to protect data from unauthorized access, breaches, and misuse. Ethically, designers must consider the potential societal implications of their work, ensuring that data is used fairly and responsibly. By fulfilling these responsibilities, database designers contribute to the ethical and responsible use of data in organizations.

Background and Scenario - This assessment is based on the scenario 'Academic Information System (AiS)" of a fictitious university called University of Gharnata. The university wants to develop an information system to support its academic activities.

Assignment Tasks -

Part A - This part is based on the 'AiS' scenario.

 (1) Using a database design approach of your choice, produce a logical design for the database to support the information system, which is needed at the University of Gharnata.

Your answer must consist of ONE of the following:

i. An entity-relationship (ER) diagram and its mapping into a set of relations. The ER diagram should show all relevant entity types, relationship types, attributes, primary keys, and structural constraints. Note that not all keys are identified/mentioned in the scenario, so you are required to identify/devise appropriate primary keys for all the entity types. Your ER diagram must not show/include any foreign keys or any such attributes that represent foreign keys as these are logical and not conceptual concepts. As part of the mapping process, for each relation, you should identify appropriate primary keys as well as foreign keys (if applicable). Furthermore, you need to make sure your relations obtained from mapping your ER diagram are in the 3rd normal form.

ii. A set of normalised relations obtained through normalisation process instead of ER modelling. You should make clear how the normalisation process has been carried out, and the reasoning employed, in particular quoting/providing evidence (series of steps) to support the decisions made and how your relations have been derived. Each relation in your answer should be in the 3rd normal form.

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(2) Based on your logical design from Part A (1) and the information available in the scenario, produce an SQL script file using Oracle 11g/12c.

Your submission must include:

i. An SQL script file containing appropriate SQL DDL (e.g., CREATE TABLE, ALTER TABLE, etc.) statements for creating all the relations from Part A (1).

ii. The output from running the script file in a live Oracle 11g/12c session (e.g., using SPOOL, copy and paste, screenshots, etc.).

iii. You should use relational features from the SQL92 standard in Oracle 11g/12c for constructing your data structures / tables, including appropriate primary and foreign keys.

iv. You should aim for a high degree of reliability in the data with use of as many constraints as possible, e.g., check constraints on various columns (e.g., particular format of primary key values, positive physical values as described in week 4 lecture slides on integrity constraints).

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Part B - This part is based on your answer / solution to Part A, i.e., design and implementation of the database for the 'AiS' scenario.

(1) Populate the database with some data (e.g., data similar to the courses and modules you study, and other relevant information within Northumbria University).

(2) Answer the following queries (retrievals) using SQL and relational algebra.

a) Display names of students, details of the course they study, details of the module they have studied and their marks for all postgraduate students.

b) Display details of all people of 'AiS' (students and academic staff), e.g., their names, their home addresses and name of the department where they work or study.

Your submission must include:

i. Relational Algebra expressions

ii. An SQL script file containing appropriate SQL DML (e.g., INSERT) statements for populating the tables you have created in Part A (2).

iii. An SQL script file containing SQL retrieval (e.g., SELECT) statements for Part B (2).

iv. An output file for running each of above the script files in a live Oracle 11g/12c session (e.g., using SPOOL, etc.).

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Part C - (1) Consider the 'AiS' scenario in the Appendix. Produce a report for the Rector of the University of Gharnata elaborating on professional, legal, ethical and security issues that need to be considered and make recommendations that you think are appropriate for 'AiS'.

The report should be concise and comprehensive and in the region of 800-900 words. You should use Harvard style of citation and referencing by following the guidelines in Pears and Shields (2008).

(2) Compare and contrast different approaches to database design (e.g., entity relationship modelling, normalisation, etc.) and briefly justify the approach you have used for answering Part A (1).

The report should be concise and comprehensive and in the region of 600-700 words. You should consult a range of literature (e.g., database text books, journal and conference articles, and quality websites). Again you should use Harvard style of citation and referencing by following the guidelines in Pears and Shields (2008).

Note - You are expected to produce a word-processed answer to this assignment. Please use Arial font and a font size of 12. For SQL code and output, you can use courier new font, which preserves SQL format and layout. You are required to use the Harvard Style of referencing and citation. The "Cite them right" guide is recommended for referencing and citation (Pears and Shields, 2008) which should be followed throughout your answer especially Part C.

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