Business Case – Assessment item – Modelling Basics

Overview of business case: 

Handy-Trady Hire (HTH) is a home repair company that employs several contractors who specialize 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 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.

HTH discovered business rules/constraints for your ERD : 

A.      A customer calls HTH to request a home repair job: Details about the customer and the requested job need to be recorded.

B.      Each trades person specialists in only one trade, and details of their trade and the date acquired need to be kept on record.

C.      HTH has several trucks (including equipment) and allocates a truck for each trades person to do a job. Although some trades persons have their own truck and equipment and advise HTH about this, so not to be assigned a truck.

D.      A requested job may require different specialization depending on the job type – that is, a job may require more than one trades person to complete.

E.      At a later interview with the manager you learnt that HTH appoint one of the trades persons to supervise others and oversee the work done by the other trades persons.

F.      Also HTH wants to keep records of how the customer was referred to them – by what source (ie- TV add, Friend, Internet, etc.)

G.      Customers have the option to make partial payments for a service, as long as they pay no later than one week after the completion of any service — Details about each payment relating to a service, amount of payment and date need to be recorded.

Your task

Create an ERD for each of the above 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 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

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