ER Diagram Design for Vehicle Fuel App

Answered using Claude 3.5 Sonnet by AI Answer Generator

Question:

Design an ER Diagram (Logical Model) for “Vehicle fuel consumption & service reminder” application under following requirements

  1. Register any number of Sri Lankan vehicles under unique identifier
  2. System should be able to keep records about a. Cost per one litter on each refilling with number of litters count b. Gasoline Refilling point address c. Mileage d. Refilling type (patrol, diesel or any other like super diesel)
  3. Service station records about a. Vehicle service date b. Next recommend service date or mileage Details of the evidence requirements are specified below:
  4. Student should able to design Entity-Relationship Diagrams using normalization forms by analyzing the requirements for a given scenario as an individual project with the following aspects
  5. The diagrams that are designed by the student should ensure the correct cardinality of a table in relation to another table
  6. Students should use accurate database notation in the ER diagram.
  7. Student should be able to develop ER diagrams using an ER modeling software tool
    (eg: MySQL Workbench )
  8. Student should mention assumptions made during the development of the ER diagram in the documentation
Answer:

I'll help you design an ER Diagram for the Vehicle Fuel Consumption & Service Reminder application. First, let's identify the entities and their relationships, and then I'll provide the logical model.

Entities:

  1. Vehicle
  • vehicle_id (PK)
  • registration_number
  • make
  • model
  • year
  • fuel_type_id (FK)
  1. FuelType
  • fuel_type_id (PK)
  • type_name
  • description
  1. FuelRefill
  • refill_id (PK)
  • vehicle_id (FK)
  • refill_date
  • cost_per_liter
  • liters
  • mileage
  • station_id (FK)
  • total_cost
  1. RefillStation
  • station_id (PK)
  • station_name
  • address
  • contact_number
  • location_coordinates
  1. ServiceRecord
  • service_id (PK)
  • vehicle_id (FK)
  • service_date
  • next_service_date
  • next_service_mileage
  • service_station_id (FK)
  • description
  1. ServiceStation
  • service_station_id (PK)
  • station_name
  • address
  • contact_number

Relationships:

  1. Vehicle to FuelType: Many-to-One
  2. Vehicle to FuelRefill: One-to-Many
  3. Vehicle to ServiceRecord: One-to-Many
  4. FuelRefill to RefillStation: Many-to-One
  5. ServiceRecord to ServiceStation: Many-to-One

Assumptions:

  1. Each vehicle can only use one type of fuel
  2. Refill stations and service stations are separate entities
  3. A vehicle can be serviced at multiple service stations
  4. Mileage is recorded during each refill
  5. Cost calculations are stored for historical tracking
  6. Registration numbers are unique within Sri Lanka
  7. Location coordinates are stored for mapping purposes

The ER Diagram would look like this (in pseudo-notation):

[Vehicle] ----< [FuelRefill] >---- [RefillStation] | |---- [FuelType] | ----< [ServiceRecord] >---- [ServiceStation]

You can implement this diagram using MySQL Workbench with the following characteristics:

  • Primary keys: Displayed with PK symbol
  • Foreign keys: Displayed with FK symbol
  • Relationships: Shown with crow's foot notation
  • Mandatory fields: Solid lines
  • Optional fields: Dashed lines
  • Tables: Properly normalized to 3NF
  • Appropriate data types for each field

Would you like me to provide more specific details about any part of this design or explain the normalization process?