October 2003
Intermediate to advanced
1072 pages
24h 21m
English
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Types of Cursors
There are four types of cursors supported by Transact-SQL: FORWARD_ ONLY, DYNAMIC, STATIC, and KEYSET. The primary differences between these types is in the ability to detect changes to their underlying data while the cursor is being traversed and in the resources (locks, tempdb space, and so on) they use.
Depending on the type of cursor you create, changes made to its underlying data may or may not be shown while traversing the cursor. In addition to new column values, these changes can affect which rows are returned by the cursor (membership) as well as the ordering of those rows. Also, opening the cursor may cause the entirety of its result set (or their keys) to be placed in a temporary table, possibly causing resource contention ...
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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.