使用xml形式表示SQL数据(具体而言就是行和表，以及视图和查询结果)的规范，反之亦然。
Specifications for the representation of SQL data (specifically, rows and tables of rows, as well as views and query results) in XML form, and vice versa.
SQL数据（具体而言就是行和表，以及视图和查询结果）以XML形式表示（或者相反）的规范。
Specifications for the representation of SQL data (specifically rows and tables of rows, as well as views and query results) in XML form, and vice versa.
这里使用了嵌套的循环连接方法来连接来自每个仓库的远程查询结果和xml合成视图结果。
The nested loop join method is used to join the remote query result from each warehouse and the XML composite view result.
下面使用以上讨论的相同的示例数据，阐释在使用和不使用查询的统计视图的情况下基数估计的差别。
Using the same sample data just discussed above, the following illustrates the difference in cardinality estimates with and without the use of statistical view for the query.
XML任务：创建并维护具有XML数据的表和视图；创建并调优xML索引；查询并查看XML文档；存储并管理XML模式文档。
XML tasks: create and maintain tables and views with XML data; create and tune XML indexes; query and view XML documents; store and manage XML schema documents.
有时，程序员和开发人员就性能而言仅仅需要获取不同的查询视图，因此他们可以修改该查询，以获得更高的效率。
Sometimes, programmers and developers just want to get a different view of their queries in terms of performance so that they can modify the query for higher efficiency.
XML任务：创建并维护具有XML数据的表和视图；创建并调优xML索引；查询并查看XML文档；存储并管理XML模式文档。
XML tasks: creating and maintaining tables and views with XML data; creating and tuning XML indexes; querying and viewing XML documents; storing and managing XML schema documents.
统计视图和REOPT都使优化器可以计算出更精确的基数估计，而后选择一个最佳查询执行计划。
Both statistical views and REOPT allow the optimizer to compute a more accurate cardinality estimate and consequently choose an optimal query execution plan.
清单5演示如何查询这个视图，从而了解关系和XML数据的压缩分别节省的空间的百分比。
Listing 5 shows how querying this view produces information about the percentage of space saved due to the compression of relational data and XML, respectively.
指定包的内容将包含刚才创建的查询、FPML数据模型和CREDITV视图。
Specify that the contents of the package will include the query you created, the FPML data model, and the CREDITV view.
同时还支持各种高级功能，如跨多个XML查询的联合，使用xml类型的视图和模式验证。
Advanced features, such as joins across several XML queries, views with XML types, and schema validation are supported.
现在考虑清单10 中的SQL语句，它通过查询视图选择办公室R344 中所有职员的ID和名字。
Now consider the SQL statement in Listing 10 that queries the view to select the ID and the first name of all employees that occupy office R344.
另外，根据XML数据量、视图的定义和为报告生成的后续查询，可能会出现运行时性能问题。
Furthermore, runtime performance concerns can arise, depending on the volume of XML data, the definition of the view, and the subsequent queries that are generated for the report.
可以将数据库表、视图和存储过程作为查询主题添加到Cognos包中。
Database tables, views, and stored procedures can be added to a Cognos package as query subjects.
视图是一个具有额外属性的DerivedTable，比如查询表达式和检查类型。
A view is a DerivedTable with extra properties, such as query expression and check type.
可以通过对DB 2编目视图syscat .TABLES和SYSCAT . TABLESPACES执行查询来确认这一点。
This can be verified by executing a query against the DB2 catalog views SYSCAT.TABLES and SYSCAT.TABLESPACES.
视图展开之后，items和item_supplied视图将在查询中合并，如图12所示。
After the view expansion, the items and item_supplied views will be merged in the query as shown in Figure 12.
现在DB2可以使用SQL/XML和XQuery语言通过为视图创建的别名来查询数据。
Now DB2 can query this data using SQL/XML and XQuery languages by using the nicknames created for the view.
VisualExplain工具提供了一个sql语句的图形化视图，这样您可以分析您的查询和优化它们的性能。
The Visual Explain tool provides a graphic view of your SQL statements so that you can analyze your queries and tune them for better performance.
针对某些API操作(如查询与业务流程和任务相关的对象)的数据库查询优化(使用物化视图或存储查询)(请参见参考资料部分)。
Database query optimization for some of the APIs' operations like querying business process and task related objects (usage of materialized views or stored queries) (see the Resources section).
查询和概要功能可以提供更加简单的数据视图。
Lookup and summary functions can provide simpler views on your data.
然后，这些信息被包括进来，用于帮助优化器在为那些符合条件的查询(这些查询不需要直接引用视图)的选择性估计和基数估计计算成本时做决定。
This information can then be included as part of the optimizer decision during costing for selectivity and cardinality estimates for qualified queries which do not need to reference the view directly.
这就允许数据联合服务器接收对集成视图的查询和计算要执行的最优子操作数量和类型。
This allows the data federation server to receive queries against the integrated view and to calculate the optimum number and types of sub operations to perform.
对于这些搜索表单，由一个数据库视图列出查询发起者、查询提交的日期和时间以及查询所包括的关键词。
A database view of these search forms is provided that lists the author of the query, the date and time the query was submitted and the keywords used in the query.
为查看者透视图创建了透视图、导航树、集合视图、详细信息视图和视图查询的定义文件。
The definition files for the perspective, the Navigation Tree, the Collection View, the Detail View, and the View Query were created for the Viewer perspective.
通过扩展和收缩复杂SQL的一部分，来深入获取更详细的查询部分，例如引用视图和子查询。
Drill into parts of the query in more detail, such as referenced views and sub-queries, by expanding and collapsing sections of a complex SQL.
查看者透视图的导航树和视图查询定义分别显示在清单4和5中。
The Navigation Tree and View Query definitions for the Viewer perspective are shown in Listings 4 and 5, respectively.
SQL管理例程和视图使得DBA和应用程序开发人员更易于查询和修改其DB 2系统的状态。
SQL administrative routines and views make it easier for both DBAs and application developers to query and modify the state of their DB2 systems.
除了在不需要编程的情况下生成和发出搜索查询外，xfy还可以在不需要编程的情况下定义视图。
In addition to generating and issuing search queries without programming, xfy also enables views to be defined without programming.
使用YQL查询，可以合并来自多个Web服务的数据，呈现新的和有用的第三方数据视图。
Using YQL queries, it is possible to combine data from multiple web services to present new and useful views of third-party data.
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