March 2001
Intermediate to advanced
640 pages
14h 9m
English
book
Sams Teach Yourself Transact-SQL in 21 Days, Second Edition
by Lowell Mauer, David Solomon, Bennett McEwan
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Altering Tables
As your application development progresses, you might realize that you should have used a different length or data type. Or maybe you shouldn't have allowed NULL in a particular column. The ALTER TABLE command can be used to make these changes. In previous versions of SQL Server, you had to drop most objects and re-create them to make any changes. As I have already said, "Things change!" It's time to figure out how to modify and add new objects or settings to a table, and how to change what is already there. The ALTER TABLE command is used to perform this work. The syntax of the command is
ALTER TABLE table { [ [ALTER COLUMN column_name { new_data_type [ (precision[, scale] ) ] [ NULL | NOT NULL ] | { ADD | DROP} ROWGUIDCOL } ...
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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.