Specifications for all primary keys and foreign keys.
对于所有主键和外键的规范。
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。
Identify the primary and foreign keys in your 3nf relations.
确定你的3nf关系的主键和外部键。
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 is a consequence of there being no primary and foreign keys in CouchDB. There are no keys to base joins on.
因此 CouchDB中没有主键和外键，没有基于连接的键。
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。
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。
In this correspondence, you need to express the link between the primary and foreign keys, and specify a value for this attribute.
在该通讯中，你需要表达主键和外键之间的联系，并指明该属性的值。
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。
Violations between primary keys and foreign keys, such as orphaned values or parent records without child records can be viewed as shown in Figure 12.
主键与外键之间的冲突，例如孤立的值或没有子记录的父记录，都可以查看到，如图12所示。
The match keyword is used here because not every column relates to a UML attribute; as presented earlier, primary and foreign keys are added in order to map UML associations as well.
在这里使用匹配关键词是因为不是所有列都与UM L属性相关；正如前文介绍过的，添加主键和外键是为了同时映射uml关联。
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。
To mark up the tables, you need to stereotype them, mark their foreign keys, and align their key gen tables to KEYGEN.
要标记这些表格，您需要给它们原型，标记它们外来的密钥，并且使它们的keygen表格调整到KEYGEN。
Clearly the use of check constraints has a minor effect on performance, but foreign keys and triggers can be extremely significant.
显然，检查约束的使用对性能有一点小小的影响，但是外键和触发器的影响却非常大。
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。
They are transformations of logical data model where the entities and relationships are transformed into tables, columns, primary keys, foreign keys, and constraints.
它们由逻辑数据模型转换而来，其中实体和关系转换为表、列、主键、外键以及约束。
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。
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
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。
Select the workdept attribute from the Employee Foreign Keys column in the table, and click OK to create the relationship.
在表格的EmployeeForeign keys列中选中workdept属性，并点击OK以创建关系。
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。
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。
Created the tables, primary keys, foreign keys, and indexes.
创建了表、主键、外键，和索引。
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。
For primary and unique keys, only the "not null" columns are listed and can be selected to define these keys. To ease the process of defining foreign keys, the following are provided.
对于主键和惟一键，只列出“非null”列并且可以选择它们定义这些键。
Further restructuring of domestic industry and success in attracting foreign investment are keys to future growth.
更长远的是，调整国内工业和有效吸引外资对于未来经济增长是关键的因素。
Indexes on the foreign keys referencing tables with few rows have low selectivity, and the utility of requiring the index has always been questionable.
外键上的索引所引用的表行数较少，选择性较少，需要索引的实用程序一直遭受质疑。
In Figure 10 you see three tables, their keys (OIDs), and the foreign keys used to implement the relationships between them.
在图10中有三张表，它们的键(oid)和外键用于在它们之间实现关系。
This is because this relational schema requires the generation and proper use of foreign keys, which are key values that are not included in the original MIML.
这是因为这种关系模式要求生成并适当使用外键，而这是原始miml中没有包括的键值。
Therefore, if your source table was either a parent or child in an RI relationship, you need to capture the foreign keys definition and recreate them after the table is moved.
因此，如果源表在RI关系中为父表或子表，您需要捕捉外键定义并在移动表之后重新创建它们。
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