December 2013
Intermediate to advanced
1872 pages
153h 31m
English
book
Microsoft® SQL Server 2012 Unleashed
by Ray Rankins, Paul T. Bertucci, Chris Gallelli, Alex T. Silverstein
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The CHECK Constraint
You can use the CHECK constraint to enforce domain integrity and to provide a means for restricting the values that can be entered in a column. A CHECK constraint is implemented as a Boolean expression, and it must not be FALSE if the insertion or update is to proceed. The Boolean expression can reference other columns in the same table, but it cannot reference other tables. Foreign keys and triggers can be used to reference columns in other tables, if needed. The expression can also include functions that do not return results. A CHECK constraint that is defined on a specific column can reference only the values in the column.
CHECK constraints are good for ensuring the format of data inserted in a column and for defining ...
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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.