Database Design and administration

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4. A courier company secks to beiild a management system to track mail deliveries or packages of its customers. - The customer must be registered in the system. The customer characteristics that are stored in this system are as following: personal identification number, name, surname, date of birth, address (serves for returning the shipment if the process is unsuccessful), email and phone number. - To each customer a card is issued which is identified by a number and its type such as: Silver, Gold or Platinum. - The package that the customer wants to send is identified by a unique number, date and time of departure (the moment when the company receives it) as well as the characteristics of the package such as: weight and dimensions (length, width and height). - The package must be delivered to the recipient by hand from a postman. The postman is identified by his personal number, name, surname and date of birth, email and phone number. - For each shipment, the system should keep track of the postman in charge for delivery, the status of delivery (delivered successfully or not) and the data and time of delivery