dmdw lesson 01 - introduction

STAATLICHANERKANNTEFACHHOCHSCHULE

Author I: M.Sc. Johannes HofmeisterAuthor II: Dip.-Inf. (FH) Johannes HoppeDate: 11.02.2011

STUDIERENUND DURCHSTARTEN.

STAATLICHANERKANNTEFACHHOCHSCHULE

Data Mining – Data Warehouse

Author I: M.Sc. Johannes HofmeisterAuthor II: Dip.-Inf. (FH) Johannes HoppeDate: 11.02.2011

Hello World

01

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Hello World

About myself

› Technical addicted, freelancer (Web 2.0, PHP / .NET)› Entrepreneur (promotion-footbags.com)› Microsoft Student Partner (studentpartners.de)› University lecturer (fh-heidelberg.de …obviously ;-)

› Feel free to call me “Johannes”!

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Hello World

How about you?

?

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Roadmap, Requirements

02

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Roadmap

› Basic knowledge about databases › Applied Data Mining

› Adventure Works› Adventure Works DW 2008› SQL Server Analysis Services

› Algorithms and Methods

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Roadmap

My course

over 50% of the lecture will be practical stuff

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Resources

› Microsoft Visual Studio 2008, SQL Server 2008http://www.microsoft.com/express/sql/default.aspx

› MSSQL Server Community Projects & Sampleshttp://www.codeplex.com/SqlServerSamples

› Adventure Works Databases for SQL Server 2008, also 2005http://msftdbprodsamples.codeplex.com/

› Adventure Works Sample Data Warehouse Documentationhttp://technet.microsoft.com/en-us/library/ms124623(SQL.90).aspx

› SQL Authority Adventure Works Tutorialhttp://blog.sqlauthority.com/2008/08/10/sql-server-2008-download-and-install-samples-database-adventureworks-2005-detail-tutorial/

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Resources

Warning:The Microsoft SQL Server is a requirement!I will NOT care about your operating system.

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Resources

10.04.2023

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Requirements

After a lecture

› I will upload the PowerPoint slides to the blog

› Category: “DMDW lecture”http://blog.johanneshoppe.de/category/dmdw-lecture/

› Feel free to post your questions in the blog! *

(* I’m really lazy in answering mails!)

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Basic knowledge

03

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Basic knowledge

Data warehouse› Using available information

Data mining› Finding new information

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Definitions

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“A data warehouse is a single source for key, corporate information needed to enable business decisions .”

Dieter Homeister (his DM Script)

Definitions

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“A data warehouse is a copy of transaction data specifically structured for querying and reporting.”

Kimball and Ross

My Definition

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“A data warehouse is a business buzzword. Let's just assume a data warehouse is a copy of crucial company information.”

Definitions

Now ignore what I just saidand take the definitionof Dieter Homeister!

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Homework!

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Homework

1. Describe elements of a relational database!

2. What is referential integrity?

3. What is redundancy? Make an example!

4. What database column type would you usein order to save a time span (not a point in time)?

5. Describe it in a Database system of your choice(SQLServer, MySql, Postgres, …)

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Homework

6. What is the difference between char and varchar datatypes in a database table?

7. What is the difference between varchar and nvarchar?

8. What datatype would you use in order to save a monetary value? Why?

9. What do the parameters of the decimal datatype stand for?

10. What is the Year 2038 problem?

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Homework

11. What do you have to look out for when choosing a datatype to be used as an automatically incremented primary key?

12. Name 4 database systems!

13. What does a database system consist of?

14. What is an integrated development environment (IDE)?

15. Describe the differences between bigint, smallint, and int.

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THANK YOUFOR YOUR ATTENTION

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