October 2013
Intermediate to advanced
172 pages
3h 51m
English
Content preview from Getting Started with Greenplum for Big Data AnalyticsBecome 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,
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In-database analytics options (Greenplum-specific)
This section covers advanced SQL techniques for in-database analytics within Greenplum.
The following techniques will be discussed in detail:
- Windows functions
- User-defined functions and aggregates
Window functions
Window functions are a new class of functions introduced in Greenplum. The WINDOW clause is used to define a window that can be used in the OVER() expression of a window function such as rank or avg. For information on OLAP extensions and window functions refer to the Greenplum Database Reference guide. Window functions allow application developers to more easily compose complex OLAP queries using standard SQL commands. For example:
- Moving averages or sums can be calculated over various intervals. ...
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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.