March 2009
Intermediate to advanced
832 pages
23h 49m
English
book
Inside Microsoft® SQL Server® 2008: T-SQL Querying
by Lubor Kollar Itzik Ben-Gan Dejan Sarka, and Steve Kass
Content preview from Inside Microsoft® SQL Server® 2008: T-SQL QueryingBecome 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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Histograms
Histograms are powerful analytical tools that express the distribution of items. For example, suppose you need to figure out from the order information in the Sales.OrderValues view how many small, medium, and large orders you have, based on the order values. In other words, you need a histogram with three steps. The extreme values (the minimum and maximum values) are what defines values as small, medium, or large. Suppose for the sake of simplicity that the minimum order value is 10 and the maximum is 40. Take the difference between the two extremes (40 – 10 = 30) and divide it by the number of steps (3) to get the step size. In this case, it’s 30 divided by 3, which is 10. So the boundaries of step 1 (small) would be 10 and 20; for ...
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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.