DATA SCIENCE
MIS0855 | Spring 2016
Storing and Retrieving Data
SungYong Um
sungyong.um@temple.edu
The Database
A collection of files, organized as tables
Tables are made up records (rows)
Rows are made up of fields (columns)
Fields are made up of characters
Database Types
Flat file database
Relational database
Flat file database
EmpNo Ename DeptNo DeptName
101
Abigail
10
Marketing
102
Bob
20
Purchasing
103
Carolyn
10
Marketing
104
Doug
20
Purchasing
105
Evelyn
10
Marketing
Relational database
DeptNo DeptName
10
Marketing
20
Purchasing
EmpNo Ename DeptNo
101
Abigail
10
102
Bob
20
103
Carolyn
10
104
Doug
20
105
Evelyn
10
Back to Big Data
Velocity
Variety
Volume
“Big Data” is a set of technologies
It is not data analytics
…Or information, or knowledge
It’s a way of processing large amounts of
data, not extracting insight from it
Why does Facebook (or
Twitter, or Instagram) care
how you feel?
Do you think this is a
problem?
Reminder: Looking for words…
Yelp reviews for Poi Dog Snack Shop
“Positive”
Word Library
Great
Fantastic
Best
Wonderful
Outstanding
Amazing
How we’ll do sentiment analysis
Retrieve Tweets
using a spreadsheet
add-in in Google
Drive
Copy the tweets
from Google
Drive to a special
Excel workbook
Excel classifies
the Tweets as
positive or
negative
“Big Data” 101: It’s just a set of
technologies…
This isn’t the only
option, but it is
among the most
popular…
What is their purpose?
What
Scenario:
• There an extremely large
database with constantly
changing data.
• My regular database and
computer can’t keep up with
this amount of data.
• Things get slow, or break
down completely.
do…
What
do…
Stores big databases in smaller
pieces across a network of
connected computers
Breaks up the task and gives
each connected computer a
small piece to work on
What those jobs are can be anything!
An example…
Stores real-time cable box
activity for 5,000,000
customers, by region
Analyzes which programs
people are mostly likely to
pause and then skip
commercials