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
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Materialized Path
So far I presented solutions where paths were computed when the code was executed. In the materialized path solution, the paths are stored so that they need not be computed repeatedly. You basically store an enumerated path and a level for each node of the tree in two additional columns. The solution works optimally with trees and forests.
This approach has two main advantages over the iterative/recursive approach. Queries are simpler and set based (without relying on recursive CTEs). Also, queries typically perform much faster because they can rely on indexing of the path.
However, now that you have two additional attributes in the table, you need to keep them in sync with the tree as it undergoes changes. The cost of modifications ...
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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.