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。
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。
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。
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。
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。
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。
If informational check constraints exist on the primary key column, you should explicitly specify informational check constraints on their corresponding foreign key columns. For example.
如果在主键列上存在信息检查约束，那么应该在它们相应的外键列上指定信息检查约束。
You can also use the system catalog views to retrieve information about NOT NULL, unique, primary key, foreign key, and table check constraints. For example.
也可以使用系统编目视图来检索关于NOT NULL、惟一、主键、外键和表检查约束的信息。
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。
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。
If a dataset contains constraints (such as a foreign-key constraint) it is possible to cause exceptions to be thrown depending on the order of operations performed against the dataset.
如果数据集包含约束(如外键约束)，则可能导致引发异常，取决于对数据集执行操作的顺序。
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。
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。
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。
应用推荐