1. www.edureka.co/datawarehousing
Introduction To DataWarehousing
View Datawarehousing Course at www.edureka.co/datawarehousing

2. LIVE Online Class
Class Recording in LMS
24/7 Post Class Support
Module Wise Quiz
Project Work
Verifiable Certificate
Slide2
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www.edureka.co/datawarehousing
How it Works?

3. Slide3
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For Queries during the session and class recording:
Post on Twitter @edurekaIN: #askEdureka
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Objectives of this Session
What is Datawarehouse?
Datawarehouse Architecture
Why Datawarehouse is used?
What is ETL?
What all you will learn in Datawarehousing and ETL course?
Hands On

4. Slide4
www.edureka.co/datawarehousing
What is DataWarehouse?
A Data Warehouse is a central location where consolidated data from multiple locations are stored
The end user accesses it whenever he needs some information
Data Warehouse is not loaded every time when new data is generated
There are timelines determined by the business as to when a Data Warehouse needs to be loaded –daily, monthly, once in a quarter etc
Source 1
Source 2
Source n
User 1
User 2
User n
Data Warehouse
.
.
.
.
.
.

5. Slide5
www.edureka.co/datawarehousing
Why do we need Datawarehouse?
The primary reason for a Datawarehouse is, for a company to get that extra edge over its competitors
This extra edge can be gained by taking smarter decisions
Smarter decisions can be taken only if the executives responsible for taking such decisions have data at their disposal
For Example: Let’s consider some strategic questions that a manager or an executive has to answer to get an extra edge over his company’s competitors
QHow do we increase the market share of this company by 5 %?
QWhich product is not doing well in the market?
QWhich agent needs help with selling policies?
QWhat is the quality of the customer service provided and what improvements are needed?
These questions may not be needed to run a business but are needed for the survival and growth of the business.
Strategic Questions

6. Slide6
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Let’s consider one of the strategic question for which a manager or an executive is trying to find answer
What is the quality of the customer service provided and what improvements are needed?
How many customer feedbacks do we have in the last 6 months?
How many customers have given a feedback of Excellent, how many averages? How many bad?
What are the comments or improvement areas highlighted by customers who have rated us bad or average?
Result 1
Result 2
Result 3
Subset
Question 1
Subset
Question 2
Subset
Question 3
Database
Why is Datawarehouse so Important?

7. Slide7
www.edureka.co/datawarehousing
Strategic questions can be answered by studying the trends.
Data Warehouse
What is the quality of the customer service provided and what improvements are needed?
Operational System
Operational System doesn’t provide trends
Data Warehouse provides trends
Result provided is in ready to access format
Result 1
Result 2
Result 3
OLTP
Why is Datawarehouse so Important?

8. Slide8
www.edureka.co/datawarehousing
What is ETL?
Source 1
Source 2
ETL
Datawarehouse
What and from where to Extract?
How to Transform?
Where to Load?
Tools available

9. Slide9
www.edureka.co/datawarehousing
Datawarehouse Architecture
Source
File 1
Other Sources
Transactional Sources
OLTP
Data Warehouse
DM 1
Reporting
Data Presentation Layer
Reporting tools
ETL
User generates reports
DM 3
DM 2
Data Access Layer

10. Slide10
www.edureka.co/datawarehousing
Advantages of DataWarehouse
Standardizes data across an organization
Smarter decisions for companies –Move towards fact based decisions
REDUCE COSTS
»Drop products not doing well
»Negotiate for improvement with suppliers
INCREASE REVENUE
»Work on the high selling products
»Customer satisfaction –Know what is working and what is not

11. Slide11
www.edureka.co/datawarehousing
Creating and Populating the Tables
Problem Statement
»From data files provided, based on requirement,createand populate the tables
»Use PostgreSQL for creating tables and Talend Open studio for loading tables

12. Slide12
www.edureka.co/datawarehousing
Requirement in English statements
Identify entities and the relations between them
Attributes and facts
Develop a model
Create the tables using POSTGRESQL
Populate the tables using ETL
Test the Jobs
Creating and Populating the Tables (Flow Diagram)

13. Slide13
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Using PostgreSQL and Talend
LOOKUP
Sales
Rating
INPUT
Country_name
Sales_person
Sales
TARGET
Country_name
Sales_person
Sales
Rating

14. Slide14
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Using PostgreSQL and Talend
CREATE TABLE INPUT
(
COUNTRY_NAME VARCHAR(20),
SALES_PERSON VARCHAR(20),
SALES INT
)
INSERT INTO INPUT VALUES ('India','ABC',100)
INSERT INTO INPUT VALUES ('Australia','MDM',50)
INSERT INTO INPUT VALUES ('USA','ETL',350)
INSERT INTO INPUT VALUES ('India','GHI',200)
INSERT INTO INPUT VALUES ('UK','EMI',245)
INSERT INTO INPUT VALUES ('USA','ETL',125)
CREATE TABLE LOOKUP
(
SALES INT,
RATING VARCHAR(30)
)
INSERT INTO LOOKUP VALUES (100,'Poor')
INSERT INTO LOOKUP VALUES (50,'Poor')
INSERT INTO LOOKUP VALUES (350,'Very Good')
INSERT INTO LOOKUP VALUES (200,'Good')
INSERT INTO LOOKUP VALUES (245,'Very Good')
INSERT INTO LOOKUP VALUES (125,'Good')

15. Slide15
www.edureka.co/datawarehousing
Finally, You will end up creating this !!

16. Slide16
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Course Curriculum
Module 1
»Introduction to Data Warehousing
Module 2
»Dimensions and Facts
Module 3
»Normalization and Schemas
Module 4
»Modeling
Module 5
»Concept of ETL
Module 6
»Project on Talend

17. Questions
Slide17
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