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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Logical Transformations
In several solutions I’ve presented, I used logical expressions with an OR operator to deal with precedence based on multiple attributes. Such was the case in the recent solutions for paging, matching current and previous occurrences, and other problems. I used OR logic because this is how human minds are accustomed to thinking. The logical expressions using OR logic are fairly intuitive for the purpose of determining precedence and identifying rows that follow a certain anchor.
However, because of the way SQL Server’s optimizer works, OR logic is problematic in terms of performance, especially when some of the filtered columns are not indexed. For example, consider a filter such as col1 = 5 OR col2 = 10. If you have individual ...
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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.