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.
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.
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.
当使用外键时(ei列被存储在它们自己的表中)，可以在外键表中找到孤立的记录并将其转化为删除存根。
When external keys are in use (ei columns stored in their own table), we are able to find the orphaned record in the external key table and turn it into a deletion stub.
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.
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.
您可以删除或修改散列条目和添加新的条目等等。
You can delete or modify hash entries, add a new entry, and so on.
注意，删除绑定包中的一个或多个语句引用的一个列将使数据库上的包无效。
Note that dropping a column that is referenced by one or more statements in bound packages invalidates the packages on the database.
另一种方式是使用带注释的模式分解将所有新文档分解到现有的副表，只修改列类型而不删除副表。
An alternate approach could be to use an annotated schema shred to decompose all new documents to existing side tables, and only change the column type without dropping the side tables.
从旧表中删除敏感列，并保留那些列中的数据，以便用于审计或者确保可以执行撤销。
Deleting the sensitive columns from the old table and preserving the data from those columns for audit purposes or to ensure the ability to do an undo.
在这个场景中，修改了表模式，完全删除了副表和一些分解的列。
In this scenario, you modified the table schema and completely dropped the side tables and some of the shredded columns.
例如，您可能需要浏览数据库，修改或删除表，执行扩展修改，在现有的表中添加列。
For example, you can browse your database for tables that need to be modified or dropped, perform extended alters, and add columns to an existing table.
客户想删除除时间维(表是在这一列上进行数据分区的)以外的其他维上的大量数据。
A customer wants to delete large amounts of data on other dimensions than time (which is the column that the table is data partitioned on).
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