January 2015
Beginner to intermediate
432 pages
12h 34m
English
book
Data Science and Big Data Analytics: Discovering, Analyzing, Visualizing and Presenting Data
by EMC Education Services
Content preview from Data Science and Big Data Analytics: Discovering, Analyzing, Visualizing and Presenting Data
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.
11
Advanced Analytics—Technology and Tools: In-Database Analytics
Key Concepts
MADlib
Regular expressions
SQL
User-defined functions
Window functions
In-database analytics is a broad term that describes the processing of data within its repository. In many of the earlier R examples, data was extracted from a data source and loaded into R. One advantage of in-database analytics is that the need for movement of the data into an analytic tool is eliminated. Also, by performing the analysis within the database, it is possible to obtain almost real-time results. Applications of in-database analytics include credit card transaction fraud detection, product recommendations, and web advertisement selection tailored for a particular user.
A popular open-source database is PostgreSQL. This name references an important in-database analytic language known as Structured Query Language (SQL). This chapter examines basic as well as advanced topics in SQL. The provided examples of SQL code were tested against Greenplum database 4.1.1.1, which is based on PostgreSQL 8.2.15. However, the presented concepts are applicable to other SQL environments.
11.1 SQL Essentials
A relational database, part of a Relational Database Management System (RDBMS), organizes data in tables with established relationships between the tables. Figure 11-1 shows the relationships between five tables used to store details about orders placed at an e-commerce retailer.
FIGURE 11-1 Relationship diagram
The table orders ...
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
Read now
Unlock full access
More than 5,000 organizations count on O’Reilly
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.