All DOC_IDs are unique to meet the foreign key constraints.
所有DOC_ID都是惟一的，以满足外键约束。
Adding or dropping unique, distinct, or foreign key constraints.
添加或删除惟一、独特或外键约束。
Some databases have different rules for primary key constraints.
对于主键约束，有些数据库具有不同的规则。
Some databases have different functionality for primary key constraints.
对于主键约束，有些数据库具有不同的功能。
This table is referenced by 20 or so other tables that have foreign key constraints.
此表由20个左右引用具有外键约束的其他表。
Minimize the triggers, CHECK and foreign key constraints, and generated columns for the table.
尽量减少表上的触发器、检查和外键约束以及生成的列。
You can use similar definitions to define foreign key constraints on usa.item_supplied nickname.
可以使用类似的定义来定义usa . item_supplied昵称上的外键约束。
By not applying key constraints in the database, a field that requires information has been left empty.
由于没有在数据库中应用键约束，必须包含信息的字段却是空的。
The key constraints of the job are identified first and a list of questions to be asked is prepared.
工作的关键约束确定第一个和一个要问的问题的列表准备。
Consult your database documentation for details about how your database works with primary key constraints.
有关数据库如何使用主键约束的详细信息，请查阅数据库文档。
Performance, ease-of-use, aesthetics, reliability, compliance, and all other key constraints must be addressed.
性能、易于使用、美观、可靠性、依从性以及所有其它约束必须被提出。
Failed to enable constraints. One or more rows contain values violating non-null, unique, or foreign-key constraints.
未能启用约束。一行或多行中包含违反非空、唯一或外键约束的值。
Key constraints include poor physical infrastructure, inefficient product markets, lack of credit, and weak land and labor markets.
主要的约束包括农业基础设施差，产品市场低效，信贷不足，土地贫瘠，劳动力市场不景气等。
The overall principle is to create a third table for each related association, and then to define the relevant key constraints.
整体原则是为每个相关关联建立第三个表，然后定义相关键值限制。
The logical model for a relational database normalizes the entities and relationships into tables with foreign key constraints.
关系型数据库的逻辑模型进一步规范化这些实体和关系，并形成带有主外键约束的表。
It is important to understand how foreign-key constraints and cascading behavior in the database are created in the generated dataset code.
您必须了解在产生的资料集程序码中，如何建立资料库中的外部索引键条件约束和串联行为。
If you publish a table by using replication, you automatically disable foreign key constraints for operations that replication agents perform.
如果使用复制发布表，则自动会为复制代理执行的操作禁用外键约束。
You can attach unique constraints to columns that allow null values, whereas you can attach primary key constraints only to columns that do not allow null values.
可将唯一约束附加到允许空值的列，但是只能将主键约束附加到不允许空值的列。
For example, creating a new customer and a new order and then trying to save the data can cause a conflict with the foreign-key constraints defined in the database.
例如，建立新的客户和新的订单，然后尝试储存资料，会导致资料库中所定义的外部索引键条件约束发生冲突。
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。
In the next few sections, we will discuss some of the key themes addressed within the RUP update for SOA — in particular, the elements, relationships, and constraints each theme introduces.
在下面几个部分中，我们将讨论针对SOA的RUP更新中的一些关键主题——特别是，要素、关系和每个主题引入的约束。
This approach to defining the competencies, and decomposing where needed, allows the organization to operationally focus on key resource constraints that may jeopardize projects and the portfolio.
这个定义能力的方法，和需要的分解，允许组织在运作上关注于关键资源的约束，这些约束可能危害项目和业务。
The index key size limit also applies to those constraints that are enforced through indexes.
索引键大小限制也应用于通过索引施加的那些约束。
Managing of the simultaneous execution of multiple asynchronous process instances under resource constraints is one of the key challenges of business process engines.
在资源约束之下，管理多个异步处实例的同步执行，是业务流程引擎的主要挑战之一。
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。
A UML profile has three key items: stereotypes, tagged values (properties), and constraints.
UM l概要文件有三个关键项：构造型、标记值(特性)和约束。
Constraints such as primary key - foreign key relationships and uniqueness of values are not possible on particular values of an XML document.
不能对XML文档的特定值执行限制，比如主键—外键关系和值的唯一性。
Primary key, referential integrity, and check constraints.
主键、引用完整性和检查约束。
Nick concludes by quoting the report "The goal is to focus on the key generic interface constraints that unite these [REST, WOA, Web Services] concepts, not debate the nuanced differences among them.
Nick引用了报告中的一句话作为 总结：“目标是关注那些把这些概念[REST、WOA、Web服务]统一起来的关键通用接口约束，而不是争论概念之间的细微区别”；
Nick concludes by quoting the report "The goal is to focus on the key generic interface constraints that unite these [REST, WOA, Web Services] concepts, not debate the nuanced differences among them.
Nick引用了报告中的一句话作为 总结：“目标是关注那些把这些概念[REST、WOA、Web服务]统一起来的关键通用接口约束，而不是争论概念之间的细微区别”；
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