These maps simply join the correct place in the database to the field of the object that you require.
这些映射只是将数据库中的正确位置与您请求的对象的字段连接起来。
But before we do, this, we will demonstrate the ability of being able to disconnect from the database to perform an offline join operation.
但是在这样做之前，我们先来演示一下断开与数据库的连接然后执行离线连接操作的能力。
This means you can get all the benefits of typical SQL join queries without the burden of predefining their relationships in the database layer.
这意味着您能够获得典型的SQL联合查询的所有好处，但又不需要在数据库层预定义它们的关系。
The number of rows retrieved from the outer table after the database server applies any table filters is small, and the inner table has an index that can be used to perform the join.
在数据库服务器使用所有表筛选器之后，从外部表检索出的行数将很少，而内部表具有一个可用于执行连接的索引。
The SQL JOIN statement has long been in the toolkit of database programmers, allowing you to combine the data contained in two or more relational database tables based upon a common attribute.
数据库编程人员对SQLJOIN语句的使用由来已久，通过该语句可以基于相同的属性将两个或更多关系数据库表中的数据组合到一起。
DB2 can then choose to perform the join or subquery at the database partition where the data is stored, instead of having to move data between database partitions.
于是DB 2就可以在存储数据的数据库分区上执行连接或子查询，而不必在数据库分区之间移动数据。
Another strategy to improve the collocation of the join is to replicate smaller dimensional tables on each database partition.
改善合并并置的另一个策略是复制每个数据库分区上的较小的表。
It will also make use of this same primary key to perform JOIN operations when accessing the database.
在访问数据库时，它还会利用同一主键执行join操作。
Change the Join Table separator to an underline (" _ ") and change the name of the database schema.
将JoinTable分隔符更改为一个下划线(“_”)并更改数据库模式(schema)的名称。
Columns in the join clauses in fact table of star schema database.
星型数据库的事实表中join子句中的列。
Querying a local database can be a slow process, especially if you have many rows of data or you need to start running complex queries that join multiple tables.
查询本地数据库是一个比较慢的过程，特别是，如果您有多行数据或者您需要在多个表之间运行复杂的查询语句。
One big advantage of a native XML database is that it can run queries that combine (or join, in SQL parlance) information contained in multiple XML documents.
原生XML数据库一个很大的优点是，可以运行能够将包含在多个 XML 文档中的信息组合在一起的查询（或者按SQL 的说法称为联结）。
As join operation to relational database, structural join order selection is at the heart of query optimization in an XML database.
和关系数据库中的连接运算一样，结构连接顺序的选择是XML数据库查询优化的核心。
The output of our disconnected JoinRowSet object correctly parallels the data we obtained when we performed our server side database JOIN query (compare to Table 3).
非连接对象JoinRowSet的输出与我们在服务器端执行join查询得到的数据完全一致(与表3比较)。
A database of people who wish to lose weight and join an online support group.
数据库的人想减肥，并加入了在线支持组。
Distance join is widely used in spatial database. Selectivity estimation for distance join is the basis of optimizing the query of the distance.
距离连接在空间数据库中有着广泛的应用，而距离连接的选择度估计是优化距离查询的基础。
This paper researches into binary join optimizing strategies of backend database machine systems.
本文研究了后端数据库机系统的二元联接优化策略。
Vast memory resource is consumed when great capacity data is retrieved while many layers of entities in a database are re - lated like a tree and join operation is carried out.
数据库中多个实体呈树形关联时，对海量数据作多层实体连接运算时要消耗系统大量的内存资源。
For distribute database query, join operation is the kind of the most common use with time-consuming and higher price and also it is the key confluence factor of the query efficiency.
在分布式数据库查询处理中，连接操作是最常用的、费时的且代价较高的一种操作，也是影响查询效率的关键因素。
Spatial join is one of the most complex and time-consuming operations in spatial database systems.
空间连接运算是空间数据库中的一种基本操作，但它也是最复杂、最耗时的操作之一。
This paper used algorithm of minimum spanning tree to realized multi-join queries of distributed database and provided analyzing method.
本文用最小生成树算法实现了分布式数据库中的多元连接查询，并进行了算法的分析与设计。
Query optimization for large join queries is one of the key factors to improving the performance of database systems.
多连接查询优化是提高数据库性能的关键问题之一。
Provides examples of how to join data in a manner similar to database joins by using LINQ.
提供有关如何使用 LINQ通过与数据库联接类似的方式联接数据的示例。
The query processing in the distributed database systems is comprehensively summarized. This paper shows that using HASHING method for thereduction of semi-join communication cost is beneficial.
本文较全面地总结了分布式数据库系统的查询处理，并提出用HASHING方法减少半连接通讯的开销是有利的。
The multi-join query optimization is the critical problem of parallel query optimization in parallel database system.
多连接查询优化是并行数据库系统的核心问题。
The multi-join query optimization is the critical problem of parallel query optimization in parallel database system.
多连接查询优化是并行数据库系统的核心问题。
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