1. MIS3500 * Asper School of Business * Travica
Exercise on Normalization - Solution
(a) Class diagram for Customer Order Management System
_OrderProduct__
Quantity
Discount
_Customer_
CustomerID
CLastName
CFirstName
Address
City
State
PostCode
CTel
___Order___
OrderNumber
OrderDate
EstRecDate
ActDecDate
__Product__
ProductID
PName
ListPrice
_Manufacturer_
ManufacturerID
MName
MTel
__Fabric___
FabricID
FabName
FabDescription
_Category__
CategoryID
CatName
CatDescription
1 places *
* is for * 1 *
* made of 1
* belongs to 1
made by
Alternatives:
Product : Fabric = M:M, association class needed
Product : Manufacturer = M:M
Business rule on multiplicity:
1. Each customer places a number of orders while each order is placed by only one customer.
2. An Order can have many products, and each product can be ordered many times.
3. A product is made of one main fabric (alt.: many), and a particular fabric can be used in many products.
4. A product belongs to one category, and each category can have many products
5. A product is made by one manufacturer (alt.: many), and a manufacturer can make many products.

2. (b) Schema for Customer Order Management System
_OrderProduct__
OrderNumber
ProductID
Quantity
Discount
_Customer_
CustomerID
CLastName
CFirstName
Address
City
State
PostCode
CTel
___Order___
OrderDate
EstRecDate
ActDecDate
__Product__
PName
CategoryID
FabricID
ListPrice
ManufactD
_Manufacturer_
ManufacturerID
MName
MTel
__Fabric___
FabName
FabDescription
_Category__
CatName
CatDescription * 1 * * *
Study carefully similarities and differences between (a) and (b).
Run normalization test:
1NF – are there repeating sections in any table?
2 NF – in tables with combined keys (OrderProduct), do non-key attributes depend on the entire key?
Is there a partial functional dependence on the key? If yes, it’s not in 2NF.
3 NF – do non-key attributes depend on the key only? Is there any dependence between non-key attributes (transitive dependence)?