The derived relational algebra operators are widely used in the relational database query languages.
关系代数的派生算子在关系数据库查询语言中得到了广泛应用。
This window is very similar to the window for a Relational Database Query feed generator. The window requires.
该窗口与Relational Database Queryfeed生成器窗口非常类似。
Referencing the mature and efficient relational database query techniques, and to take the strategy space for time.
借鉴关系数据库成熟高效的查询技术，并采取以空间换时间的策略。
An example is the language SQL (Structured query language), which forms the backbone of most relational database query system.
一个例子是结构化查询语言，它是大多数关系数据库查询系统的基干形式。
Traditional relational database query language SQL is designed for relational tables, and not suitable for XML or GML semistructured data;
传统的关系数据库查询语言SQL是针对平面的二维关系数据而设计的，并不适合XML/GML半结构化数据的查询；
Select Relational Database Query (SQL) under the enterprise section (as shown in following Figure 3), then click on the Next button to proceed
选择enterprise部分下面的Relational Database Query (SQL)（见图3），然后单击Next按钮继续
Based on this model, this paper constructs two different kinds of medium relational database query languages: medium relational calculus and medium relational algebra.
给出了中介关系数据模型，在此基础上构造了两类不同的中介关系数据库查询语言：中介关系演算和中介关系代数。
They're considerably slower than a join on a relational database, but, as a result, it is much harder to create a query that overwhelms the data store.
这要比关系数据库上的连接慢得多，因此很难创建一个让数据存储超负荷的查询。
Manipulations like this (backed by the proper relational theory) are at the heart of database query optimizers. The resulting tree is shown in Figure 2.
此类操作(由恰当的关系理论作为支持)是数据库查询优化器的核心所在。
As I showed, db4o offers quite a few more ways to query than your typical relational database can, giving you a range of options for dealing with various application scenarios.
正如我所说的那样，与通常的关系数据库相比，db4o可以提供更多的方法来进行查询，为您处理不同应用程序场景提供了更多选择。
With pureXML, you can efficiently store, control, query, and update XML data alongside relational data stored in the same table or database.
使用pureXML，您可以有效地存储、控制、查询、更新XML数据以及存储在同一个表格和数据库中的关系数据。
The expressive power of XQuery is comparable to the criterion of "relational completeness" defined for database query languages, though no such formal standard has been defined for an XML data model.
XQuery的表达能力可以与为数据库查询语言定义的“关系完整性”标准相比，虽然还没有为XML数据模型定义这样的正式标准。
For example, early attempts at storing XML data in varchar2 fields of a relational database resulted in poor query performance when an XQuery engine was simply layered on top.
比如，最初曾经尝试将XML数据保存在关系数据库的varchar2字段中，然后简单地增加一个XQuery引擎层，结果查询性能很差。
Mongo collections, much like relational database tables, need to be properly indexed to ensure reasonable query performance.
Mongo集合(非常像关系数据库表)需要正确进行索引以便确保合理的查询性能。
Like other relational database management systems such as Oracle and SQL Server, Informix has its internal optimizer, which is responsible for selecting the best query execution plan.
与Oracle和SQLServer等其他关系数据库管理系统一样，Informix也有内部优化器，负责选择最佳的查询执行计划。
Most important, many problems are much easier to solve with a native XML database and XQuery than with a relational database and Structured Query Language (SQL).
最重要的是，和关系数据库以及结构化查询语言(SQL)相比，使用原生xml数据库和XQuery将更容易解决众多问题。
Work with a relational database: Structured Query language.
处理关系数据库：结构化查询语言。
Structured Query language (SQL) : a standardized language used to define objects and manipulate data in a relational database.
结构化查询语言(Structured Query Language,SQL)：一种标准化语言，用于在关系数据库中定义对象及操纵数据。
Relational query multi table ACCESS database routines, a good reference, there is a need to download it.
说明：ACCESS数据库多表关联查询例程，很好的参考资料，有需要的就下载吧。
The query syntax is object oriented and there is no concept of tables, indices, or other typical relational-database concepts. For example, the following query returns all StockBean objects in a list.
查询语法是面向对象的，并且没有了表、索引或其他典型的对象关系型数据库的概念。
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。
In this paper, based on a schema translation from Object-Oriented Database (OODB) to Relational Database (RDB), it proposes an algorithm for translating OODB query to RDB query.
文章基于从面向对象数据库(OODB)到关系数据库(rdb)的模式转换，提出了一种从面向对象数据库查询到关系数据库查询的转换算法。
In this paper, we describe an algorithm, for query processing with semantic optimization in distributed relational database systems.
本文描述一个分布式关系数据库系统中具有语义优化的查询处理算法。
Finally, since the data is stored in a relational database, the paper describes the item tracking query and object-oriented path query into SQL statements as the template form.
最后，由于数据是存储在关系数据库中，本文还以模板的形式，介绍了把物品追踪查询和面向路径查询转化成SQL语句的方法。
SQL, which is a structured query language, has been an international standard language of relational database. This paper shows the corresponding relations between algebra of relations and SQL.
SQL是一种结构化的查询语言，已成为关系数据库的国际标准语言。
In this paper, an interface model of the natural language is proposed, which is suitable to the query of relational database on MIS.
本文提出一种适用于管理信息系统中关系数据库查询的自然语言接口模型。
In this paper, a relational database based on nested relation is proposed it supports text storage and text operator. The text query is supported by signature file indexing technology.
本文提出的一个嵌套关系模型支持文本存储和文本检索操作，其中特征文件索引为文本检索提供了技术支持。
The paper introduces an Extended Relational Model Database System ERDB and a GIS based on ERDB. We mainly discuss the problems of expression of topology in GIS and recursive query.
本文介绍了一个扩展关系模型数据库系统ERDB和在该系统之上开发的一个GIS系统。
The paper introduces an Extended Relational Model Database System ERDB and a GIS based on ERDB. We mainly discuss the problems of expression of topology in GIS and recursive query.
本文介绍了一个扩展关系模型数据库系统ERDB和在该系统之上开发的一个GIS系统。
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