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<td align="center" valign="middle" class="til"><h3> MS SQL基础教程:SQL数据库表的修改 </h3>
发布时间：2007-12-25 来源：网络/责编：编程入门 作者：佚名<br />
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</table><p> 当表创建好后，可能根据需要要对表的列、约束等属性进行添加、删除或修改，这就需要修改表结构。 </p>
<p> 7.4.1 用Enterprise Manager 修改</p>
<p> 在Enterprise Manager 中选择要进行改动的表，单击右键，从快捷菜单中选择“DesignTable”选项，则会出现如图7-4 所示的修改表结构对话框。可以在图7-4 所示的对话框中修改列的数据类型、名称等属性或添加、删除列，也可以指定表的主关键字约束。单击工具栏中的图标<img onclick="get_larger(this)" alt="" src="/upimg/071226/11b611P44F26341.gif" />，出现如图7-5 所示的编辑表和约束的属性的对话框。可以在其中编辑各种约束和一些表的属性。</p>
<img onclick="get_larger(this)" alt="" src="/upimg/071226/11b611P4R032412.gif" /><img onclick="get_larger(this)" alt="" src="/upimg/allimg/070501/2028060.gif" />
<p> 7.4.2 用ALTER TABLE 命令修改</p>
<p> ALTER TABLE 命令可以添加或删除表的列、约束，也可以禁用或启用已存在的约束</p>
<p> 或触发器。其语法如下：</p>
<p> ALTER TABLE table</p>
<p> { [ALTER COLUMN column_name</p>
<p> { new_data_type [ (precision[, scale] ) ]</p>
<p> [ COLLATE < collation_name > ]</p>
<p> [ NULL | NOT NULL ]</p>
<p> | {ADD | DROP} ROWGUIDCOL } ]</p>
<p> | ADD</p>
<p> { [ <column_definition> ]</p>
<p> | column_name AS computed_column_expression</p>
<p> }[,...n]</p>
<p> | [WITH CHECK | WITH NOCHECK] ADD</p>
<p> { <table_constraint> }[,...n]</p>
<p> | DROP</p>
<p> { [CONSTRAINT] constraint_name</p>
<p> | COLUMN column</p>
<p> }[,...n]</p>
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<p>上一篇：<a href='/data/SQLServer/jc/200712/6339.htm'>MS SQL基础教程:自定义数据类型</a> 下一篇：<a href='/data/SQLServer/jc/200712/6341.htm'>MS SQL基础教程:查看表</a> </p></td>
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