查询词典 database engine

The traditional query tree optimization methods,parallel database optimization methods based on left linear trees and right linear trees,bushy trees,and operation of the forest,have their own pros and cons,they have been more in-depth and maturity of the study.The query optimization method based on multiple weighted tree has studied its model of parallel query plan,its complexity model of parallel query plan and query optimization algorithms.The semantic query method transforms an inquiry into one or several semantic equivalence inquiries then has to find and implement a strategy to achieve a better query.Agent-based parallel database query optimization using Multi-Agent technology to automatically search the integrity constraint conditions which are related to the determined query,there for,the efficiency between several relations' joins has been greatly improved.The parallel optimization algorithm,based on genetic algorithm which is suitable for multi-joins of cluster environment,has deeply studied the relations storage options,multi-joins query optimization and query processing and other key technologies based on cluster parallel database.

传统的查询树优化方法，即基于左线性树、右线性树、浓密树、操作森林的并行数据库查询优化方法，各有优劣，对其的研究比较深入、成熟；基于多重加权树的查询优化方法，研究了其并行查询计划模型、并行查询计划的复杂性模型和查询优化算法；语义查询优化方法将一个查询变换成一个或数个语义等价的查询，进而寻找并执行这些等价查询中具有较好实现策略的一个；基于Agent的并行数据库查询优化采用Multi-Agent技术自动查找与给定查询有关的完整性约束条件，使得多个关系间连接操作的效率得到很大的提高；基于遗传算法的并行优化算法，深入研究了基于机群并行数据库中关系存储的选择、多连接查询优化和查询处理等关键技术。

With these values defined, WordPress will use the designated database characterset and database collation (ie sort order of the letters, numbers, and symbols of a character set) when connecting a database tables.

与这些价值观的界定，在WordPress将使用指定的数据库字符集和数据库的整理（即排序顺序的字母，数字和符号的字符集）时，连接数据库表。

The database of this system is based on Microsoft Visual Database Tools built in Visual Basic 6.0.And the interface of this system is made of costumed windows and system windows. combines At the same time, we use band control and DAO for accessing database and SQL for the implement of finding operation. and use SQL inquire about definitely Realize the book, the stock, to finish granting relevant to operate it teaching materials of teaching materials of teaching material on the basis of this.

本系统的数据库是通过可视化数据管理器建立起来的，而系统的界面采用了自定义窗体和系统窗体相结合的方式制作；同时，系统采用绑定控件访问数据库和数据访问对象访问数据库两种访问方式，并使用SQL查询语言对系统查询功能进行编码并在此基础上实现教材的预订、教材的库存、教材的发放等相关操作。

The Database,Union Catalog Database of Chinese,Western letters, Japanese and Russia, its plat is on base Web journal database applications server, The Documentation and Information Center of CAS...

中国科学院文献情报中心牵头研建的"全国中西日俄文期刊联合目录数据库"正是这样的 Web平台期刊数据库应用系统，本文简要阐述了该数据库的概况、网络服务系统的功能特点、服务对象和方式及其进一步扩展的服务功能

UserID and Password are stored in an database, in the case of this sample, the database is a SQL Server 2005 Mobile database.

用户名和密码存储在数据库，在这个样本情况下，该数据库是SQL Server 2005移动数据库。

Given the difference in database management systems, it is clear to see why the Versant database uses an object database for its projects.

鉴于不同的数据库管理系统，很清楚地看到为什么Versant数据库使用一个对象数据库的项目。

Database time types and the relationship between database time and bitemporal database has been discussed. Combining the space and time, the notion of spatio-temporal model was educed.

结合空间和时间，引出了时空数据模型的概念，重点回顾了前人的研究成果，讨论了各种时空概念模型的各自特点。

Recently, skyline computing has been becoming a hot topic due to its potential applications in many scenarios, including traditional database, distributed database, data stream and even the categorial database and so on.

近来，skyline计算在集中式数据库、分布式数据库、数据流及分类属性数据集上的良好应用前景，使其成为当前数据库界研究的最热点之一，受到了学术界和工业界的广泛关注。

Database management uses the characteristics of embedded application program to design the media property database after the compromise of time and space; and uses CCeDBOpt to encapsule the operations for database in order to present conveniently to the upper level module for using.

数据库管理模块结合嵌入式应用程序的特点，在时间和空间上折中后选用CEDB进行多媒体属性数据库的设计；并用CCeDBOpt类对数据库的操作进行封装，以方便呈现给上层模块使用。

Detailed explaining the design method of the simulation scenario database and applying it to build a example database.4. Presenting the significance, structure, function and implementation of Traffic Intersection Simulation System, which was developed by the authors team. Combined the work forenamed, introducing the design and development of the data structure and database of the system.

结合笔者所在团队开发的交通路口微观仿真系统(Traffic Intersection Simulation System，简称TiSS)所做的工作，介绍了TiSS的开发背景与意义，详细分析了系统结构与功能，并结合前文完成的研究工作，重点介绍了仿真场景中数据结构及数据库的设计与开发工作。

Many will continue to choose to live in duality and in conflict.

许多人将继续选择活在二元对立性和冲突中。

I find that students of the University of Physical Education all wear sportswear at first sight.

我发现：体育大学的学生乍一看，都是穿运动衣，大家都一样