我们有一个栏目<代码>char(16),该栏必须长于char(128)。 如果表包含100 000多个浏览器,如何改变2008年服务器R2的数据类型? 这可能是偶然的。
How expensive is this operation?
假设你的名字,你可以
ALTER TABLE YourTable ALTER COLUMN YourCharColumn CHAR(128)
or in case some difficulties
ALTER TABLE YourTable ADD NewChar char(128) NOT NULL CONSTRAINT df DEFAULT OldChar
GO
ALTER TABLE YourTable DROP CONSTRAINT df
GO
ALTER TABLE YourTable DROP COLUMN OldChar
GO
exec sp_rename( YourTable.NewChar , OldChar , COLUMN )
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