April 2006
Intermediate to advanced
640 pages
16h 46m
English
Content preview from Inside Microsoft® SQL Server™ 2005: 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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Deleting Data
In this section, I’ll cover different aspects of deleting data, including TRUNCATE vs. DELETE, removing rows with duplicate data, DELETE using joins, large DELETEs, and DELETE with OUTPUT.
TRUNCATE vs. DELETE
If you need to remove all rows from a table, use TRUNCATE TABLE and not DELETE without a WHERE clause. DELETE is always fully logged, and with large tables it can take a while to complete. TRUNCATE TABLE is always minimally logged, regardless of the recovery model of the database, and therefore, it is always significantly faster than a DELETE. Note though, that TRUNCATE TABLE will not fire any DELETE triggers on the table. To give you a sense of the difference, using TRUNCATE TABLE to clear a table with millions of rows can take ...
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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.