允许添加列并指定列属性。
The Columns view allows you to add columns and specify the properties of the columns.
清单2中的代码示例展示了如何向树中添加列。
The code example in listing 2 shows how columns can be added to a tree.
可以在现有的索引中添加列，让查询处理的一部分只访问索引。
You might add a column to an existing index to get index-only access for a portion of the query's processing.
我们通过实例化treecolumn类(第23和28行)来向树中添加列。
We add columns to the tree by instantiating the TreeColumn class (lines 23 and 28).
在弹出的对话框中，给新的表格名命(我的是“Books”)，然后添加列信息。
B. In the resulting dialog, give your table a name (mine is "Books"), and add the column information. I chose.
当向表添加列可能造成使用隐式列列表的应用程序失败时，这一特性非常有用。
This can be useful when adding a column to a table can cause existing applications using implicit column lists to fail.
您可以通过添加列和行、包括其他来源的数据、创建用于计算的公式等，从而操作工作表。
You can manipulate the worksheet by adding columns and rows, including data from other sources, creating formulas for computations, and so on.
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.
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.
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.
它使您可以有效地将一个状态机列添加到数据库中。
It lets you effectively add a state-machine column to your database.
我们在前一节中添加了三列，这正是保持功能连续性的第一步。
We already started looking for functional continuity in the previous section by adding three columns.
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.
通过将额外列添加到此表，您可以存储特定于国家的验证模式。
By adding a few extra columns to that table, you could store country-specific validation patterns.
当添加新行或列来显示新的内容时，很容易出现排版错误。
It was easy to make typographical errors when adding new rows or columns to display new content.
由于去掉了这个限制，即使数据库不是用utf - 8格式创建的，用户也可以更改一个表以添加xml列，或者创建一个包含xml列的新表。
Because this restriction is removed, even if the database is not created in UTF-8, a user can alter a table to add an XML column or create a new table with XML columns.
我们将需要添加新列，甚至是新表，来存储新的数据元素。
We will need to add new columns, and perhaps even new tables, to store the new data elements.
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.
还支持向现有表添加新列。
无论向wishes表添加什么列，都会按照相同的顺序显示在您的应用程序中。
Whatever columns are added to the wishes table will automatically be present in your application, in the same order.
在接下来的例子中，向Tomahawk数据表添加新列，会变得更加容易。
In the following example, you make it easier to add new columns to a Tomahawk data table.
在编辑器中选择表，并使用Properties视图添加新列，如图8b所示。
Select the table in the editor, and add the new column using the Properties view, as shown in Figure 8b.
运行rakedb：migrate，将email列添加到USERS表中。
Checkconstraints视图—允许添加表及其列的检查约束。
Check constraints view a "Allows adding check constraints for a table and its columns."
sysindices表格中添加了新的列ustbuildduration和ustlowts。
New columns ustbuildduration and ustlowts were added to the sysindices table.
将已配置和值绑定的组件添加到当前列中，通过将完成的列添加到DataTable的子项中结束列循环迭代。
Add your configured and value-bound component to the current column, and end your column loop iteration by adding the completed column to the children of the DataTable.
使用这种方法，如果把列添加到稍后含有不同信息的表中，则可以输出这些列。
This way, if you add columns to the table later that have different information, you can print them.
我们还为音频和视频列添加了标签，并在垂直布局集合中包含了它们。
We also added labels for the audio and video columns and included those in the vertical layout selection.
在其他迁移的结果之上构建的迁移(例如一个迁移要向其他迁移创建的表中添加一列)会保持一致。
Any migration building on the contents of others, such as a migration adding a column to a table created by another migration, remains consistent.
在其他迁移的结果之上构建的迁移(例如一个迁移要向其他迁移创建的表中添加一列)会保持一致。
Any migration building on the contents of others, such as a migration adding a column to a table created by another migration, remains consistent.
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