Download Labs - Week 11

Week 11 – Data Warehouse
INFOSYS 222
Agenda
Agenda
• Data Warehouse
• Star Schema
• Practice on previous exam question
Data Warehouse and Star Schema
• What is data warehouse?
• How is it different from database?
• How to implement a data warehouse?
• What is a star schema?
2010 INFOSYS 222 SC Exam
• The supermarket chain
wishes to use this
information to answer
queries about the
purchases and would like
the data sourced from this
operational database to
be fed into a data
warehouse
• Design a star schema for
the data warehouse. The
finest grain for time is one
week
2015 INFOSYS 222 S2 Exam
The company Northwind is interested to build an OLAP system to analyse the sales
figures they have obtained over the last 3 years of daily operational data in the
database as described by the data model in Figure 3. In particular, they are interested
to know how the weekly sales are affected by factors like country of customer,
employee, and shipper.
Draw a star schema of the data warehouse based on the information given.
OrderDetail
OrderID (FK)
ProductID (FK)
UnitPrice
Quantity
Discount
Order
Category
SupplierID
CategoryName
Description
CompanyName
ContactName
ContactTitle
Address
City
Region
PostalCode
Country
Phone
Fax
HomePage
Product
OrderID
ProductID
OrderDate
RequiredDate
ShippedDate
Freight
ShipName
ShipAddress
ShipCity
ShipRegion
ShipPostalCode
ShipCountry
ShipperID (FK)
CustomerID (FK)
EmployeeID (FK)
ProductName
QuantityPerUnit
UnitPrice
UnitsInStock
UnitsOnOrder
ReorderLevel
Discontinued
CategoryID (FK)
SupplierID (FK)
Customer
CustomerID
CompanyName
ContactNAme
ContactTitle
Address
City
Region
PostalCode
Country
Phone
Fax
Shipper
ShipperID
CompanyName
Phone
Supplier
CategoryID
Region
RegionID
Employee
RegionDescription
EmployeeID
LastName
FirstName
Title
TitleOfCourtesy
BirthDate
HireDate
Address
City
Region
PostalCode
Country
HomePhone
Extension
Note
PhotoPath
Territory
TerritoryID
TerritoryDescription
RegionID (FK)
EmployeeTerritory
EmployeeID (FK)
TerritoryID (FK)