November 2006
Intermediate to advanced
1232 pages
34h 10m
English
book
Microsoft® SQL Server™ 2005 Administrator's Companion
by Edward Whalen, Marcilina Garcia, Burzin Patel, Stacia Misner, Victor Isakov
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Enforcing Integrity with Constraints
Constraints are an ANSI-standard method used to enforce the integrity of the data in the database. They are rules that SQL Server Database Engine enforces for you. There are various types of constraints, each of which enforces a specific rule. All of the built-in constraints are enforced before a data change is made to the database so that if a constraint is violated, the modification statement is not executed. This way, there is no rollback of data necessary if the constraint is violated.
SQL Server 2005 provides the following types of constraints:
PRIMARY KEY constraints
UNIQUE constraints
FOREIGN KEY constraints
CHECK constraints
DEFAULT definitions
NULL/NOT NULL constraints
The following sections will describe ...
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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.