October 2006
Intermediate to advanced
464 pages
16h 11m
English
Content preview from Inside Microsoft® SQL Server™ 2005, Fourth EditionBecome 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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Altering a Table
SQL Server 2005 allows existing tables to be modified in several ways. Using the ALTER TABLE command, you can make the following types of changes to an existing table:
Change the data type or NULL property of a single column
Add one or more new columns, with or without defining constraints for those columns
Add one or more constraints
Drop one or more constraints
Drop one or more columns
Enable or disable one or more constraints (applies only to CHECK and FOREIGN KEY constraints)
Enable or disable one or more triggers
Changing a Data Type
By using the ALTER COLUMN clause of ALTER TABLE, you can modify the data type or NULL property of an existing column. But be aware of the following restrictions:
The modified column can’t be a text, image, ...
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