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Thread: Design Help

  1. #1
    Join Date
    Nov 2004

    Unanswered: Design Help

    hi I'm creating a project and i just need some guidance on if my ERD is designed right so i can move on to creating tablesTips and welcomed!...thx...Here are the business rules.

    The Ocean Ford dealership wishes to manage data about their car sales. They are interested in keeping information about their customers. They wish to record data about all customers, whether they purchase a car or not – this data includes, name, address, phone and what marketing tool brought them into the dealership (recent newspaper ad about a particular vehicle, TV commercial, word of mouth or radio commercial).

    When customers leave without purchasing a vehicle, the dealership wishes to ensure a methodical follow up strategy is taken. The dealership wants to record the following:
    (1) the date and salesperson who places a telephone call to the customer thanking them for their visit and inviting them to return, as well as the customer’s response;
    (2) The date and the name of the sales manager who places a telephone call to the customer thanking them for their visit and inviting them to return, as well as the customer’s response to the telephone call and;
    (3) The date a letter from the owner or Ocean Ford is sent to the customer thanking them for their visit.

    When customers purchase a new vehicle the dealership wishes to record for tracking purposes whether the car purchased is on order or is in current inventory. When a customer purchases a previously owned vehicle they wish to record whether the customer purchases an extended warranty and the mileage at the time of sale.

    Ocean Ford also wishes to maintain data about their inventory new and previously owned. Data about cars, trucks, SUVs and minivans include: vehicle identification number, model, exterior color, interior color and year. The cars, Focus and Mustang, both have the additional attribute, package; while the Five Hundred model has the unique attribute, body style. Trucks have a few unique attributes (with the exception of the 2005 E series): cab, box, drive and doors. The SUVs, Escape, Explorer, and Excursion, have the unique attributes, drive and engine. The SUVs, Explorer Sport Track and Expedition, just has the attribute, drive. Although Ocean Ford is contemplating adding commercial trucks to their inventory, currently there are no other types of vehicles in Ocean Ford’s inventory. Obviously a vehicle can be only one kind of vehicle at a particular time.

    A customer may purchase one or more new or used vehicles from inventory and each vehicle is purchased by one or more customers (a new car in inventory may be traded in the next year, entered into inventory and then sold to another customer.) The organization is interested in the date of purchase, amount of sale and salesperson(s) completing the sale.

    Attached Thumbnails Attached Thumbnails ERD.jpg  

  2. #2
    Join Date
    Aug 2003
    Where the Surf Meets the Turf @Del Mar, CA
    Provided Answers: 1
    OK, I need to be educated.
    What are those circles with "d" in them supposed to be?
    You can lead some folks to knowledge, but you can not make them think.
    The average person thinks he's above average!
    For most folks, they don't know, what they don't know.
    Good judgement comes from experience. Experience comes from bad judgement.

  3. #3
    Join Date
    Sep 2004
    London, UK
    It seems to indicate a subtype, since "Looking Customer" and "Purchase Customer" are under "Customer", and similarly "New Vehicle" and "Used Vehicle" are under "Vehicle", further subtyped into "Car", "Truck" and "SUV". So basically the model shows CUSTOMER and VEHICLE with an undefined "purchase" relationship between them (what would we do without business analysts). Looks like the real rules are in the text description.

    I've never seen that notation before either. What tool is it generated from?
    Last edited by WilliamR; 12-10-04 at 06:50.

  4. #4
    Join Date
    Nov 2004
    the D means disjointed...meaning that a one object can only belong to one category...ex a customer is either a purchaser or a looker...suggestions? BTW i used visio to create that diagram

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