1. Prepared by Trevor Scherlin Fall 2012 DIRTBIKE ORDER DATABASE– ER DIAGRAM

2. Step 1: Define Entity Classes and Primary Keys Step 2: Define Relationships Among Entity Classes Step 3: Define Fields for each Relationship Step 4: Create Database Designing Databases with Entity Relationship Diagrams

3. Entity ClassPrimary Key CustomerCustomerID OrderOrderID ProductProductID DistributorDistID Step 1: Define Entity Classes and Primary Keys Business Rules Each order is made by a single customer Each customer can have multiple orders Each customer can have one order Customers can be in your database without any orders Products can be listed in your database but not purchased Orders cannot be blank Orders can have more than one (multiple) products A distributor can supply multiple products A distributor has to supply at least one product Each product has to have a distributor

4. E-R DIAGRAMS Use 5 symbols 1.Rectangle – entity class 2.Dotted line – relationship 3.| - single relationship 4.0 – zero/optional relationship 5.Crow’s foot (  ) – multiple relationship

5. PRODUCT CUSTOMER ORDER Step 2: Define Relationships Among Entity Classes DISTRIBUTOR DETAILED ORDERS

6. Step 3: Define Fields for each Relationship CustomerIDLastNameFirstNameAddressCityStateZipcodePhone Customer OrderIDCustomerIDOrderDate Order ProductIDProductNameMaunfacturerColorMSRPIgnitionWeightQOHDistID Product DistIDDistributor OrderIDProductIDQuantity Detailed Orders

7. Step 4: Create Database (At this point we will begin working with our DBMS system, which will be Microsoft Access)