foreign key是什么意思

网络释义

用法例句

Two means to implement referential integrity are provided by most commercial relational database:declaring foreign keys and defining some triggers.

声明外部关键字或定义触发器 。

In this paper , we propose a new method for data indexing on top of the current Distributed Hash Table peer-to-peer networks,using a distributed tree indexes architecture that enable partial-keywords matching.

基于DHT的P2P网络很大程度地增加了网络的可扩展性和健壮性,但是它也带来了新的问题,在结构化的p2pDHT网络中,在事先知道所要搜索资源的全部关键字的情况下,通过DHT很容易定位到对应资源,但是,实际应用中,用户有时在搜索资源的过程中只给出了部分关键字,这时即使网络中存在相关资源也不能被发现。

Index rebuild is only available for Primary or Unique keys (Foreign keys do not have enforcing indexes).

索引重建仅适用于主关键字或唯一关键字（未强制索引外部关键字）。

Do you want to verify new check constraints and foreign keys against existing table data?

需要对已有表的数据验证新的检查约束和外部关键字吗？

Foreign Key definition must include a referenced Table name and list of columns in the referenced Table which matches the number of columns in the Key Table.

外部关键字定义必须包括一个引用表名称以及与关键字表中字段数相匹配的引用表中的字段的列表。

Select both primary key table and foreign key table before selecting any field for the relationship.

在选择任何关系字段之前应选择主键表和外部键表。

The public keyword means that the method is available to the outside world (described in detail in Chapter 5).

其中，关键字“public”意味着方法可由外部世界调用（第5章会详细解释）。

alternate key

替代关键字,备用关键字

Digital Infrared Navigator for Surgery;

数字式红外手术导航仪关键技术研究

The part of the program status double word that contains the write key.

程序状态(双)字中包含有写关键字的那一部分。

Application of Mathematica in Finding All Candidate Keys for Relational Schema

Mathematica在求解关系模式全部候选关键字上的应用

EXPLORING THE APPLICATION OF THE MNEMONIC KEY-LETTER METHOD TO FOREIGN VOCABULARY ACQUISITION;

运用关键字母法记忆外文词汇的实验研究

Digital Modeling and Finite Element Analysis of the Key Components Shearer

采煤机数字化建模与关键零部件有限元分析

Research on Key Technology of Digital Inspection System of the Parts of Airplane

飞机零部件数字化检测系统中的关键技术研究

key field evaluation character set

关键字段求值字符集

There is already a primary key in this table's key collection.

该表的关键字集中已有一个主关键字。

Key Image Processing Techniques Applied in Virtual Facial Plastic Surgery;

用于面部整形外科的关键图像处理技术

Research of the Influence of Key External Elements on the Tendency of the Dual Channels Choosing;

关键外部要素对双重渠道选择倾向的影响研究

The internalization of negative externalizato of the mining power the key to building up harmonious society;

采矿权负外部性内化是构建和谐社会的关键

Improving Environment of Investment: Key to Drawing Foreign Fund;

改善投资环境是西部地区吸引外资的关键