Entity-Relationship Diagram Assignment Draw the associated E-R Diagram and signify which components need to be included to meet the defined needs. 1) The user is a director of research for a large

Entity-Relationship Diagram Assignment

Draw the associated E-R Diagram and signify which components need to be included to meet the defined needs.

1)     The user is a director of research for a large foundation. Approximately three hundred facilities are staffed by the foundation s twelve-hundred employees. Over seventeen hundred projects are currently underway, with some three-hundred and fifty waiting to be worked on in the future.

The system is responsible for information regarding the current state of affairs only. Requests for information are:

·      List all current employees in name sequence

·      List all employees who work at a particular facility

·      Determine which facility has the most employees; which has the fewest

·      Display the names of all employees currently working on a particular project

·      Display all projects an employee is currently working on

·      Locate inactive (no employee assigned) project

·      Determine the ratio of active to inactive projects

2)     The user is responsible for all shared hardware devices in the building. Approximately five-hundred and twenty-five devices are installed in three-hundred offices. Each device can be shared by any number of users.

The system is responsible for keeping track of:

·      The office in which each device is installed

·      The date the device was installed

·      The users authorized to employ the device

·      The ten devices that have the largest number of users; and the ten witch have the fewest

·      The total number of devices currently installed

·      The average number of devices per office; the office with the most devices; and the office with the fewest

·      Users who are authorized to use devices in more than one office

·      A list of all offices without a device of some sort

3)   The user is a manager of a growing air freight service. Seven-hundred routes are traveled by some of the firm s eight-hundred and fifty planes each day. Customer packages are assigned to a particular route. Each route is assigned to a particular plane each day.

The system is responsible for the following operations:

·      Display the plane for a given route

·      Display the route for a given plane

·      Determining how many packages are on each route, the average number of packages per route, the route with the most packages and the route with the fewest

·      Keeping track of the total number of unavailable (route assigned) and available (no route assigned) planes

·      Displaying all the packages given a customer name

·      Locating the customer for a particular package

·      Calculating the percentage of currently available planes

4) The user is a manager of a large taxi cab service. Seven hundred cabs are manned by about fourteen-hundred drivers on two shifts. The city of operation is divided into nine-hundred square areas, each consisting of a number of streets. All streets are straight and run either east/west or north/south. A street may be in more than one area. Street names are unique. Each driver is assigned to a particular cab and area when they arrive for work. The driver reports to the dispatcher by radio upon pick-up ( cab 47, in use ) and delivery of customers at their destination ( cab 47, available ). The driver also reports area changes ( cab 47, area 13 ).

The system is responsible for the following operations:

·      Locating the area, given the names of two intersecting streets

·      Locating an available cab in a given area

·      Determining how many cabs are in each area, the average number of cabs per area, the area with the most cabs and the area with the fewest cabs

·      Keep track of the total in use and available cabs

·      Locating a driver given his name

·      Calculating the percentage of currently available cabs.

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