Modelling. Create an ERD for each of the following statements that describe the current business rules for HTH.

Overview of business case:

Handy-Trady Hire (HTH) is a home repair company that employs a number of contractors who specialise in different areas. Contractors have a specialisation in any of the following areas:

Electrical
Cabinet making
Landscaping, plumbing
Driveway sealing
Roof cleaning
Interior & Exterior painting

HTH started as a small family business and for the past five years has been tracking and managing their business activities using an Excel spreadsheet. With view to their expanding business and under the new management, they decided to investigate the option of implementing a database system. Accordingly they hired you to design a relational database to better track and record their operational data.

Your task

Create an ERD for each of the following statements that describe the current business rules for HTH. For each new statement being the business rule, extend the ERD to include the additional business rule in the ERD (created in previous point for example; B will include A&B, C will include A, B & C, etc.)

Use Crows Foot notations and include all of the following in each part:

  • All entities with Primary key and any foreign key attributes;
  • The relationships between entities;
  • The cardinality and optionality of each relationship;
  • Any M:N relationships are be resolved to 1:M relationships

HTH discovered business rules/constraints for your ERD:

  1. A customer calls HTH to request a home repair job: Details about the customer and the requested job need to be recorded. (3 marks)
  2. Each tradesperson specialises in only one trade, and details of their trade and the date acquired need to be kept on record. (3 marks)
  3. HTH has a number of trucks (including equipment) and allocates a truck for each tradesperson when hired by HTH. Some tradespersons have their own truck and equipment and advise HTH about this, so in this case they are not assigned a truck. (3 marks).
  4. A requested job may require different specialisation depending on the job type – that is a job may require more than one tradesperson to complete. (4 marks)
  5. A customer makes a payment for each job by several methods: (by cheque, cash or bank transfer). HTH need to keep a record of payments made by each customer and the method of payment need to be kept. (2 marks)

NOTE:

  • Use https://www.draw.io to create your ERD
  • Include the PKs where appropriate
  • Manually drawing the ERD is NOT acceptable.

NOTE: The overview of business case is included here to provide context only. For the purpose of identifying entities, attributes and relationships between entities please read HTH business rules and instructions for creating your ERD below.

NOTE: For guidance on how to draw an ERD based on business rules, watch this YouTube video:

Rationale

This assessment aligns with the following subject outcomes:

  • be able to analyse and model business database requirements using Entity Relationship Diagrams (ERD)

Marking criteria

The marking criteria for this assignment is:

Task HD DI CR PS
Create an ERD that represents the entities, attributes, the relationships between entities, and the cardinality and optionality of each relationship that are described by the three business rules The ERD accurately identifies and correctly shows all entities, PKs, attributes, relationships, associative entities (if applicable), cardinalities and optionalities The ERD accurately identifies and correctly shows all entities, PKs, attributes, relationships, and associative entities (if applicable) but some of the cardinalities and optionalities are incorrect The ERD accurately identifies and correctly shows most entities, PKs, attributes, but some of the relationships, associative entities (if applicable), cardinalities and optionalities are incorrect The ERD identifies and shows some entities, PKs, attributes, but most of the relationships, cardinalities and optionalities are incorrect

Presentation

Use https://www.draw.io to create your ERD

Requirements

Either save your ERD diagram as a PDF or embed it in a Word document.

Don’t use any other file formats

Don’t submit your file in XML

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