Restrictions and usage notes on DROP column.

DROP COLUMN的限制和使用说明。

Dropping a column, using the new DROP column clause.

使用新的DROP column子句删除列。

OLTP compression-drop column is supported, but internally the database sets the column UNUSED to avoid long-running decompression and recompression operations.

对于oltp压缩也是不支持列删除，但是我们可以把列设置为unused的，避免解压缩和重新压缩操作队它的影响。

You first drop the tables, if they exist, so that you can cleanly create new tables with the exact column definitions you need.

如果存在的话，首先放弃这些表，以便您可以用所需的正确的列定义创建新表。

In cases where the data type of a column can be altered, the list of compatible data types is automatically listed in the data type drop down for each column.

如果列的数据类型可以更改，则兼容数据类型的列表在每个列的数据类型下拉列表中自动列出。

Drop the column from the replication table.

从复制表删除列。

Drag and drop an HTML table from the palette onto the editable section in the middle of the JSP page. Select 3 rows and 1 column.

将HTML表格从选项板拖放到jsp页面中间的可编辑区域上，选择第3行和第1列。

In addition, notice that the header facet that you added to the column in an earlier step is shown with the Drop a component here text.

另外，注意您在前面步骤中向列添加的报头facet，会和Drop a component here文本一起显示。

This effectively means that an ALTER operation cannot be used to drop a column on a table that contains an XML column.

这实际上意味着，在包含xml列的表中，不能用ALTER操作删除列。

Drag and drop a Link component from the palette and drop it on the output text component in the Price column.

从选项板上拖拉一个Link组件，然后将其放到price栏中的输出文本组件中。

Drag a JSF dropdown control and drop in the new column (Figure 28).

拖动jsf dropdown控制，将其放到新列中(图28)。

Drag and drop the group MYDBCard from the input card to the output card group rule column.

将组MYDBCard从输入卡拖放到输出卡组规则列。

You might recall the graphs from last month's column showing how throughput can drop dramatically once multiple threads contend for a built-in monitor lock using synchronization.

您可以回想上月专栏中的图，该图显示了一旦多个线程使用同步竞争一个内置监视器，吞吐量将如何大幅度下降。

Pick the block type from the drop-down, set its position in the column, enable it for display, save it by pressing CTRL + s, and close it.

您可以从下拉菜单中选择块的类型，设置它在列中的位置，并启用显示它，然后使用CTRL + S进行保存并关闭这个页面。

Return to your test page and try to drop the button onto the column tag again.

转回至测试页面，并再次尝试将按钮拖到列标签上。

This could be the built-in composite application navigator that appears as a column to the left of the screen, or it could be a custom control that presents a list of buttons with drop-down options.

这可以是屏幕左边显示为列的内置复合应用程序导航器，也可以是呈现按钮列表及其下拉选项的定制控件。

Drag and drop the rest of the elements to their related table column.

将剩下的元素拖放到相关的表列上。

All you need to do is select the appropriate connection from the drop-down list in the Net Name column; in this case, uart_RX.

要做的就是从Net name列的下拉列表中选择合适的连接；在本例中，选择uart_RX。

The variable association dialog is launched by clicking the value column of the condition row, and selecting Use a variable to return the value in the drop-down box.

通过单击条件行的value列，并在下拉框中选择use a variable to return the value，可以打开变量关联对话框。

Open the Tomahawk library definition and go to the Drop Properties section for the column tag.

打开tomahawk库定义并转至column标签的Drop Properties部分。

In the Method column of the product row, select Pass data item value from the drop down box.

在这个产品行的method列中，从下拉框中选择Pass data item value。

Run rake db: migrate to drop the existing DOCUMENTS table, create the new XML-data-only table called XML_CONTENTS, and the new DOCUMENTS table (without the XML column).

运行rake db： migrate以删除现有的documents表、创建只存储XML数据的新表xml_contents和新的documents表(不包含xml列)。

Drag and drop the "Sortable column title" to the title cell of a column that you want to have sorting capabilities.

把“ Sortable Column Title ”拖放到希望实现排序功能的列的标题单元格中。

If you prefer to drag fields from the field list to the drop zones, you can... this is also the answer to how you add fields to the Filter or Column drop zones.

如果你喜欢从字段列表中拖拽字段到拖拽区域，你可以这么做……这也是怎样添加字段到筛选或列拖拽区域的答案。

This is important because a high pressure drop would mean that more energy is required to drive the vapour up the distillation column.

这一点很重要，因为如果压力下降太大，就意味着需要更多能量来推动蒸气上升。

Experimental results showed that the circumfluent hydrocyclone with a separate column has the highest collection efficiency and the lowest pressure drop.

实验结果表明，带分离柱的环流式旋流器压降最低，效率最高。

In the experiment of liquid viscosity measured by rotary column method, the uniform drop time and distance are calculated theoretically.

通过理论计算得到了“转柱法测液体粘度”实验中砝码下落达到匀速所需要的时间和运动距离。

The system measures pressure drop through the material column to determine the onset temperature for the sintering of bituminous rock.

根据达西定律设计了沥青岩输送特性实验系统，该系统利用压降法测量沥青岩的初始粘结温度。

After analyzing and discussing these results of drop test, a reasonable imitation style of spin up and spring back on the column style drop test bed is proposed.

通过对这些落震试验结果进行分析和讨论，得出了在立柱式落震试验台上进行落震试验时合理的起转和回弹载荷的模拟方式。

Dan Shiyu column thinks, of giant drop should not be average level, should want than average level low.

但史玉柱认为，巨人的跌幅不应该是平均水平，应该比平均水平要低。