添加或删除列(10.00中新增)。
但是，压缩表不允许添加或删除列。
A compressed table, however, does not allow adding or dropping of columns.
使用新的DROPcolumn子句删除列。
从复制表删除列。
从表中删除列(remove_column)。
当前提供程序不支持在记录对象上添加或删除列。
Current provider does not support adding and deleting columns on the record object.
使您可以选择列以更改其位置、删除列或查看其属性。
Enables you to select a column to change its position, delete it, or view its properties.
还记得么：在Preprocess选项卡，可以从数据集中删除列。
Remember: On the Preprocess TAB, you can remove columns from the data set.
删除列之后要求进行表重组，然后才允许进行进一步的表访问。
Dropping a column requires table reorganization before further table access is allowed.
这实际上意味着，在包含xml列的表中，不能用ALTER操作删除列。
This effectively means that an ALTER operation cannot be used to drop a column on a table that contains an XML column.
这可以采用添加列、更改列的数据类型、添加约束或者甚至删除列的方式来实现。
This can take the form of adding a column, changing the data type for a column, adding a constraint, or even deleting a column.
大多数的模式操作，比如添加和删除列，都可以使用Rails的内置方法完成。
Most schema manipulations, such as adding and removing columns, can be done using Rails's built-in methods.
以后可以在documents表中添加或删除列，而不会受到xml_contents表中xml数据的影响，也不会影响这些XML数据。
Future addition or removal of columns on the DOCUMENTS table can take place, neither being effected by XML data or effecting XML data in the XML_CONTENTS table.
您可以设置主要关键字，创建并编辑查询，添加并删除关系，以及设置一个同步列。
You can set primary keys, create and modify queries, add and remove relationships, and set a concurrency column.
删除目标表不需要的所有结果集列。
Delete all result set columns except those required by the target table.
编辑文本，让它包含想要的列标题，删除单元格原来的内容。
Edit the text so that it contains the desired column header, and delete to original content of the cell.
使用xml列的更新或删除操作。
同样，第一列对应着空的目标单词，所以它就是删除0,1，…，i个字母的成本。
Similarly the first column corresponds to an empty target word, so it is the cost of deleting 0, 1,..., I letters.
在sdiff形式中，源的老版本和旧版本都各在一边显示出来，同时显示的还有两边之间的一列，它能指示是否添加、删除或者更改了行。
In sdiff style, the old and new versions of the source are displayed side-by-side, with a column between them indicating whether the lines were added, deleted, or changed.
在todo_foreign中，这将需要两个列；删除日期可能为null，表示该事项仍然在活动中。
In todo_foreign, that would require two columns; the deletion date might be null to indicate that the item is still active.
在“密码(Password)”列中你会看到一段很长的加密字串；删除该字串，输入我们的新密码。
Under the "password" field, you will see a long list of encrypted letters. Delete these letters, and type in a new password.
当视图在DominoDesigner 中打开后，删除Date和Topic 之外的全部列，并在最左侧添加一个用于分类的列，如图9 所示。
When the view opens in Domino Designer, delete all columns except Date and Topic, and add a categorized column at the far left, as shown in figure 9.
编辑XMLRelationalmapping操作符，删除目标表不需要的所有列定义。
Edit the XML Relational Mapping operator, deleting all column definitions except those required by the target table.
从Resultcolumns表中删除begin和end列。
Delete the columns named begin and end from the Result columns table.
当进行少量更改时，例如添加或删除数据库列，该功能可以有效地减少数据库管理员对模式的修改操作。
This effectively reduces the need for database administrators to modify schemas when simple changes, such as the addition or removal of database columns, are performed.
通过点击影响分析列中的名字，您可以查看前面分析的结果，或者您可以重新分析、重新命名或者删除掉项目。
You can view the results of a previous analysis by clicking the name in the Impact analysis column, or you can reanalyze, rename, or delete the project.
您可以直接添加一个列，或者从已存在的列中删除掉字段以腾出空间。
You can add a column directly or delete the fields from existing columns to make room.
有些操作（例如删除表或列）也会破坏数据。
Some operations, such as dropping tables or columns, also destroy data.
注对于添加了空间列的源表，根本不需要这个触发器；一旦删除了一行，它就消失了。
NOTE in the case of a single, integrated table, this trigger is not needed at all; once a row is deleted, that's it.
可以添加和删除索引；通过删除、改名或添加列来修改表；甚至在必要的时候借助于SQL。
You can add and drop indexes; alter tables by dropping, renaming, or adding columns; and even drop down into SQL as necessary.
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