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Part One
Business Exotic Merchandiser
1.Entities
AreasOrders
CategoriesProducts
CustomersSales Territories
EmployeesShippers
Order DetailsSuppliers
.Relationships
Areas ¨ Sales Territory
Categories ¨ Products
Customers ¨ Orders
Customers ¨ Areas
Employees ¨ Orders
Employees ¨ Sales Territory
Order Details ¨ Orders
Order Details ¨ Products
Orders ¨ Customers
Orders ¨ Employees
Products ¨ Suppliers
Products ¨ Categories
Sales Territory ¨ Employees
Sales Territory ¨ Areas
Shippers ¨ Orders
Suppliers ¨ Products
. & 4. Attributes
AreasCategoriesCustomersEmployeesOrder
DetailsOrdersProductsSales
TerritoryShippersSuppliers
AreaIDCatIDCustIDEmpIDOrdIDOrdIDProdIDEmpIDShipIDSupID
DescNameAreaIDLNameProdIDCustIDItemAreaIDNameName
DescCoNameFNamePriceEmpIDSupIDPhoneTitle
ContactTitleQuanShipIDCatIDAddr
TitleDOBDiscDateQuanPerUnitCity
AddrHireDateRequiredPriceState
CityAddrShippedInStockZip
StateCityMethodOnOrderCountry
ZipStateFreightReorderPhone
CountryZipShipAddrDiscontFax
PhoneHomePhoneShipCity
FaxExtShipState
SupervisorShipZip
ShipCoun
NOTE Identifier attributes are highlighted bold and yellow. The bold items without highlights would be foreign keys.
5. E-R Design
Part Two
The first example of a many to many relationship is that each order that is placed by the customers will contain several lines (or at least one line) that list what item was ordered, how many of that item were ordered, and so on. Each item for sale may appear on more than one order. So there is a many-to-many relationship between the order and products entities. The second example of a many to many relationship is in a library, customers can borrow many books and each book can be borrowed by many customers, so this seems to be a simple many-to-many relationship between customers and books.
Two examples of ternary relationships (single relationship between three tables) are
1. Shipment, Supplier, Part
. Customer, Order, Salesman
One ternary relation that exists is the relationships between the supplier, products and the order details table. A supplier provides the product that then becomes part of the order. Another ternary relationship that exists is the customer, employees and sales territory tables. A customer purchases from an employee who services a sales area. The third ternary relationship that exists is the relationship between the ship, customers and order tables. The customers set up a shipping preferred shipping method from the available shipping methods and the order dictates the method.
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