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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Updating Data
This section covers several aspects of updating data, including UPDATEs using joins, updating large values types, and SELECT and UPDATE statements that perform assignments to variables.
UPDATE Using Joins
Earlier in this chapter, I mentioned that T-SQL supports a nonstandard syntax for modifying data based on a join, and I showed DELETE examples. Here I’ll cover UPDATEs based on joins, focusing on cases where the nonstandard syntax has advantages over the supported standard syntax using subqueries. I’ll also show how you can use CTEs to update data based on joins.
I’ll start with one of the cases where an UPDATE based on a join has a performance advantages over an UPDATE using subqueries. Suppose you wanted to update the shipping information ...
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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.