Foreign keys that do not have indexes defined.
外键未定义索引。
Mapping relationships to database foreign keys.
将关系映射到数据库外键。
Specifications for all primary keys and foreign keys.
对于所有主键和外键的规范。
Showing all the foreign keys associated with a table.
显示与一个表相关联的所有外键。
Created the tables, primary keys, foreign keys, and indexes.
创建了表、主键、外键，和索引。
They know all about normal forms and foreign keys and SQL.
们了解有关普通表单和外键以及SQL的所有内容。
For the sake of simplicity, it contains no explicit foreign keys.
为简单起见，该图不含显式的外键。
Expose foreign keys found in fact tables to Transformer modelers.
给 Transformer建模师提供事实表中发现的外键。
We've also seen how foreign keys are represented in the Schema files.
我们还知道如何在模式文件中表示外键。
So to make things simpler for this article, no foreign keys are used.
因此为了简化起见，本文没有使用外键。
Foreign keys allow you to relate a row in one table with a row in another.
外键可以让您将一张表中的一行与另一张表中的一行相关起来。
The fact tables can be filtered on one or more of their foreign keys.
事实表可以根据一或多个外键过滤。
SQLObject lets you define relationships among tables as foreign keys.
SQLObject允许将表之间的关系定义为外键。
Keys view a "Allows defining primary keys, unique keys, and foreign keys."
keys视图—允许定义主键、惟一键和外键。
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。
Provides access to common queries based on primary keys, foreign keys, and indexes.
为基于主键、外键和索引的通用查询提供访问
In fact, DrySQL generates your associations automatically, foreign keys and all.
实际上，DrySQL会自动生成关联、外键和所有的东西。
Relationships in relational databases are maintained through the use of foreign keys.
关系数据库中的关系是通过使用外键来维护的。
Foreign keys within tables maintain the relationship between intra-group and inter-group tables.
表中的外键维护着组间以及组内表之间的管理。
Tests 11, 14, and 15 show that having two foreign keys can more than double the insert time.
test11、14和15表明，当有两个外键时，insert的耗时要翻一番。
The last step is to make sure that the foreign keys are correctly defined for the relationships.
最后一步是确保外键能为相互关系适当地定义。
Again, notice that GORM allows you to think in terms of objects instead of primary or foreign keys.
同样地，我们注意到GORM也允许您从对象而不是主键或外键的角度来思考。
Learn about relational databases, data models, unique keys, primary keys, foreign keys, and table joins.
了解关系数据库、数据模型、惟一键、主键、外键和表联结。
Outer joins can be converted to inner joins by augmenting fact tables with default values for foreign keys.
可通过用针对外键的默认值来填充fact表，来将外部连接转换为内部连接。
Declaring associations in your Ruby classes and setting up the foreign keys in the schema. It would all go away.
在Ruby类中声明关联并在Schema中设置外键，这一切都会消失的。
Transform the output of Step 2 for compatibility with ID Resolution, replace primary and foreign keys with tokens.
为了兼容性，用IDResolution转化第二步中的输出，用记号取代主键和外键。
The star schemas require the generation and proper use of primary or foreign keys for the fact and dimension tables.
星型模式要求生成并适当使用事实表和维表的主键或外键。
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)。
Of course, there are other ways of creating foreign keys; the discussion of which is beyond the scope of this article.
当然，创建外键的方法有多种；不过如果要深入下去，那么就超出了本文的讨论范围。
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。
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