March 2012
Intermediate to advanced
442 pages
9h 31m
English
Content preview from IBM DB2 9.7 Advanced Application Developer CookbookBecome 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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Working with OLAP functions
Consider a scenario where we have a sales table that holds sales data for different regions, and we want to rank all regions based on their total sales. We might also want to rank them based on their contribution to the total profit. This can certainly be achieved by writing complex SQL statements. Let's see what DB2 offers in such situations. DB2 provides a rich set of Online Analytical Processing (OLAP) functions that provide us with the ability to perform complex ordering and aggregation of result sets, in a very simple manner. OLAP functions do not perform any kind of filtering, and act on every row in the result set. They are always applied on a window. We can also use scalar functions and aggregate functions over ...
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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.