Relational Model

Assessment 2 Data Implementation – Case Study The following case study models a mobile phone company. The company has a number of phones that are sold by staff to various clients. Each phone comes with a plan and each plan has a number of features specific to that plan including:

• a call charge in cents per minute (this does not apply to all plans) • a plan duration in months • a break fee if the customer leaves the plan before the end of the plan duration • a monthly data allowance in gigabytes

Assumptions that are made for the assignment are:

• mobile phones are locked to a plan for the length of the plan duration Entity-Relationship Diagram

Relational Model

CUSTOMER CALLS MOBILE STAFF TOWER CONNECT PLAN CustomerID CallsID MobileID StaffID TowerID ConnectID PlanName Surname MobileID PhoneNumber Surname Location TowerID BreakFee Given CalledNumber BrandName Given Bandwidth CallsID DataAllowance DOB CallDate Joined DOB MaxConn MonthlyFee Sex CallTime Cancelled Sex SignalType PlanDuration PhoneHome CallDuration PlanName Joined CallCharge PhoneWork DataUsage PhoneColour Resigned PhoneFax CustomerID Address Address StaffID Suburb Suburb Postcode State Phone Postcode SupervisorID Commission RatePerHour

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