Order Database – ER Diagram Prepared by Shelbi Hood Sophomore- Fall 2016

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

Step 1: Define Entity Classes and Primary Keys There is not a limit to the number of orders a customer may place. Each customer can have one order, multiple orders, or be in your database without any orders. Each order is made by a single customer. Orders must have at least one product. Orders may have multiple products. The same product could be sold through many orders. Products can be listed in the database but not ordered by a customer. Entity Class Primary Key CUSTOMER CustomerID ORDER OrderID PRODUCT ProductID ORDERITEM OrderID ProductID Business Rules 1. Customer may have many orders. 2. Customers may have no orders. 3. Order can have one customer. 4. Order must have a customer. 5. Order must have at least one product. 6. Order can have many orders. 7. Product can have multiple orders. 8. Product may not appear on any order.

Step 2: Define Relationships Among Entity Classes CUSTOMER ORDER PRODUCT

Step 3: Define Attributes for each Table CUSTOMER CustomerID FirstName LastName EmailAddress Major Location Gender ORDER OrderID CustomerID OrderDate PRODUCT ProductID ProductName Price BatchSize Description ORDERITEM OrderID ProductID Quantity

Step 4: Create Database http://students.uwyo.edu/shood3/IMGT2400/CCCDataBase.accdb