You cannot define triggers for external tables.
不能为外部表定义触发器。
You cannot use multiple external tables in the main query.
不能在主查询中使用多个外部表。
Manipulating built-in opaque data types in external tables.
处理外部表中的内置opaque数据类型。
For the best results with external tables, follow these practices.
使用外部表时要获得最佳结果，请遵循以下最佳实践。
Be aware of the following restrictions on the use of external tables.
注意外部表的以下使用限制。
Case 5: Having stored procedure using dynamic SQL and external tables.
用例5：采用使用动态sql和外部表的存储过程。
The data files associated with the external tables will not undergo any changes.
与这些外部表关联的数据文件不会受到任何更改。
Primary: all supported operations on external tables are allowed on the primary server.
主服务器：在主服务器上允许外部表上的所有受支持操作。
Similarly, other UDTs, like opaque or complex, can also be used with the external tables.
类似地，其他UDTs（比如opaque和complex）也可用于外部表。
Creation of external tables also includes a USING clause in addition to the column specification.
除列指定之外，外部表的创建还包含一个using子句。
The introduction of external tables within the IDS server fulfils the requirement and provides better performance.
IDS服务器中引入的外部表满足了这个需求，并且改善了性能。
The paper analyzes the pneumatic pump for SN-ratio test by use of the direct-product of internal and external tables , and has determined the optimal parameters.
采用内、外表直积法，对风动水泵进行了SN比试验分析，确定了其最佳参数组合。
Reduction of return data based on better definition of metadata (using External tables).
根据更好的元数据定义减少返回数据(使用外部表)。
External tables provide a normal table interface to data files that reside in the underlying operating system.
外部表对驻留在底层操作系统中的数据文件提供一个普通的表界面。
External tables can be created with the columns of all the data types supported by the regular base table in IDS.
外部表可以使用IDS中的常规基表支持的所有数据类型的列创建。
External tables provide an easy and intuitive way to perform the unload and load operations through the SQL interface or stored procedures.
外部表特性提供了一种简单直观的方法来通过SQL界面或存储过程执行加载和卸载操作。
External tables provide an easy and intuitive way to perform the unload and load operations through the SQL interface or stored procedures.
外部表特性提供了一种简单直观的方法来通过SQL界面或存储过程执行加载和卸载操作。
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