In the foreign databases you can submit to all the countries in that database, target a specific country or submit to individual sites of your choice.
在外国数据库中，你可以提交到那个数据库中包含的所有国家，以一个特定的国家为目标或者提交给你所选择的个别的国家。
For one-to-one associations, developers have to select which end of the association holds the foreign key that represents the other end (this gets propagated down to the database schema).
对于一对一关联，开发者必须选择关联的哪一端持有代表另一端的外键(这会向下传给数据库模式)。
Having the database generate values for the primary key for a table (and by extension, any foreign key values for related tables) eliminates the burden from the application from having to do so.
数据库为一个表格的主键生成值(通过扩展，为相关表生成外主键)，从而将程序从这项任务的重担中解放出来。
Plus, the fact that the infrastructure is still relational allows the XML data to leverage the proven capabilities of the relational database like triggers, constraints, and foreign key relationships.
另外，基础结构仍然是关系型的，这使XML数据能够利用关系数据库的实用功能，比如触发器、约束和外键关系。
This makes importing foreign keys easier in relational database models.
这样使得在关系数据库模型中导入外键更方便。
If you'd like to create foreign keys, which is a great idea, check the vendor documentation for your database or ask your friendly neighborhood database administrator (DBA).
如果愿意创建外键，当然很好，请参阅数据库厂商提供的文档或者咨询数据库管理员(DBA)。
One parameter is a collection of associative arrays that describe the database: table names, column names, primary keys, and foreign keys.
一个参数是描述数据库的关联数组集合：表名、列名、主键和外键。
To do so, click on the Add icon, and then select the database object type Foreign Key Constraint, as shown in Figure 4c.
为此，单击add图标，然后选择数据库对象类型ForeignKeyConstraint，如图4c所示。
Mapping relationships to database foreign keys.
将关系映射到数据库外键。
Redhill Consulting provides a nice foreign_key_migrations plugin, which adds support for foreign keys within Rails' database migration framework; see Resources for a link to more info.
Redhill Consulting提供了一个很好的foreign_key_migrations插件，它增加了在Rail数据库迁移框架中对外键的支持；有关更多信息，请参看参考资料中的链接。
If you're using MySQL and want to define foreign keys for a table, you'll need to define those fields in code after loading the schema from the database.
如果使用的是MySQL，而且想要为表定义外键，则需要在从数据库中加载模式之后，编写代码定义这些字段。
MySQL was actually a more popular open-source database, but it lacked too many features (for example, foreign keys).
MySQL实际上是更加流行的开放源码的数据库，但是它缺少太多的特性(比如，外键支持)。
To better understand this, let's return to the world database and consider two of its tables, Country and City, which are linked to each other via the code foreign key.
为了更好地理解这一点，我们回到world数据库并考虑它的两个表Country和City，此二者通过code外键相互链接在一起。
Some database administrators do not like polymorphic associations because they do not use true foreign keys, but for ChangingThePresent, we freely use them.
一些数据库管理员不太看好多态关联，原因是他们不怎么使用真正意义上的外键，但对于ChangingThePresent，我们自由地使用了多态关联。
Early enterprise applications used database tables and foreign-key relationships between them to model entities.
早期的企业应用程序使用数据库表和表之间的外键关系进行实体建模。
As far as I am concerned the use of stored procedures, database triggers and foreign key restraints is OPTIONAL, not MANDATORY, therefore I am free to exercise my option not to use them.
这样的话，我认为存储过程，触发器，外键是可选的，而不是强迫的，因此我可以自由的选择不去用它们。
This will not affect the referential integrity or primary-foreign key relationships between the tables in the membership database.
这不会影响到成员数据库中表格之间的主-外键关系。
On the other hand, a physical data model is a database-specific model that represents relational data objects (for example, tables, columns, primary and foreign keys, and their relationships).
另一方面，物理数据模型是数据库特定的模型，它代表关系数据对象，例如表、列、主键、外键以及它们的关系。
For instance, MySQL doesn't offer full support for foreign keys, meaning it doesn't have all the relational features of Informix, which is a complete relational database.
例如，MySQL不提供全面的外键支持，这意味着它不具有Informix的所有关系特性，而Informix是一个完整的关系数据库。
Op_import: Converts sample database files from the foreign format (abi) to native format.
op _ import：将采样数据库文件从外部格式(abi)转换为本地格式。
ActiveRecord USES primary and foreign keys for a variety of tasks, and both are defined as constraints on your database.
ActiveRecord会为不同的任务变量使用主键和副键，它们都是作为数据库的约束而定义的。
The web application framework that I have built using PHP does not use stored procedures, database triggers or foreign key constraints, yet it does not suffer from any lack of functionality.
我使用php构建的web开发框架不使用存储过程，触发器和外键，然而不会感到缺乏功能特性的痛苦。
Prior to 2003, the domestic database encryption means through the compilation of foreign security database system.
在2003年之前，国内的数据库加密手段是通过反编译国外安全数据库系统完成的。
Listing 5 adds a trail and a location to the database, managed with a foreign key pointing from the location_id column in trails to the id column in locations.
清单5向数据库添加了一条赛道和一个地点，由从trails中的location_id列指向locations中的id列的外键管理。
The second stage is the introduction of foreign products into the domestic market as well as the domestic database encryption products budding stage.
第二阶段是国外产品导入国内市场以及国产数据库加密产品萌芽阶段。
Subsequently, the domestic R & D team began to develop a database encryption products, although there is no small gap with the foreign top technology, but after all, is a very important first step.
随后，国内陆续有研发团队开始进行数据库加密产品的开发，虽说与国外顶级技术有不小差距，但毕竟是迈出了非常重要的第一步。
The purpose is to learn from the advanced technology of software and database exploitation in foreign countries, so as to enlighten us on the construction of digital libraries and databases.
其目的在于借鉴国外先进的软件开发和数据库技术，以期对我国数字图书馆及数据库建设有所启示。
Definition: a relationship exists between two database tables when one table has a foreign key that references the primary key of another table.
定义：当两个表中，一个表的外键和另一个表的主键存在一种关联关系，我们把这种关系称为数据库关系。
Definition: a relationship exists between two database tables when one table has a foreign key that references the primary key of another table.
定义：当两个表中，一个表的外键和另一个表的主键存在一种关联关系，我们把这种关系称为数据库关系。
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