foreign key

外键

双语例句

For foreign key creation, another table with a primary key with a compatible data type is required. 对于创建外键，则需要另外一个具有主键的表，且该主键具有兼容的数据类型。

Indexes are defined on all primary and foreign key columns to support efficient joins between the12 tables. 全部主键和外键均定义了索引，来支持12个表之间有效的结合。

Therefore, you need to map the foreign key attribute in Employee to the Department's primary key. 因此您需要将Employee的外部关键字属性，与Department的主关键字映射上。

Creating a foreign key using the Foreign Key tool is also very easy. 通过ForeignKey工具创建一个外键也是非常容易的。

This makes it virtually impossible for us to create a foreign key. 这使得我们几乎不可能创建外键。

Ensure dependent tables in a referential integrity ( RI) relationship have indexes that exactly match the foreign key. 确保参照完整性（referentialintegrity，RI）关系中的依赖表拥有与外键匹配的索引。

This category of overhead includes CHECK constraint verification and foreign key constraint ( referential integrity ( RI)) verification. 这一类的开销包括检查约束验证和外键约束（参照完整性（RI））验证。

Missing join predicates, but only if a foreign key is defined. 丢失连接谓词，只在定义了外键的情况下。

Each one-to-many association is buried as a foreign key in the table of the many class. 每个一对多的关联在表中多个类中充当外键。

In the case of a one-to-one relation, your transformation creates a foreign key in each table 在一对一关联的情况下，你的转换在所有表中都建立了一个外键

The belongs_to expresses the one-to-one foreign key relationship between the DOCUMENTS and USERS table. belongsto表达了DOCUMENTS与USERS表之间一对一的外键关系。

Above, a many-to-one relationship is defined across a foreign key that is also part of a primary key. 在上例中，跨外键（也是主键的一部分）定义了多对一关系。

In the case of one-to-many relations, your transformation creates a foreign key in every "many" table 在一对多关联的情况下，你的转换在所有“many”表中建立了一个外键

One column links to the form ( the row in the table) using a foreign key. 一列使用一个外键链接到表单上（表中的一行）。

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。

After the foreign key constraint with index disabled is dropped and recreated, the reversion completes successfully. 终止和重新创建索引禁用的外键之后，降级就成功完成了。

You need a foreign key, and also a column that defines the type of the target class. 这时，您需要一个外键，还需要一个能定义目标类的类型的列。

Our virtual foreign key is based on two columns from the TB_RIGHT table. 我们的虚拟外键基于TBRIGHT表的两个列。

A foreign key attribute, is automatically created in PROJECT. 在PROJECT中会自动创建一个外键属性COMPCODE。

The new foreign key value does not exist in the referenced table. 新外键值不存在于被引用的表中。

Use to define a foreign key between two tables in your Object Relational diagram. 用于在对象关系图中定义两个表之间的外键。

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。

Select both primary key table and foreign key table before selecting any field for the relationship. 在选择任何关系字段之前应选择主键表和外部键表。

This row contains data in a foreign key that requires a primary key value that has been deleted. 此行在外键中包含的某些数据要求主键值，而该主键值已被删除。

Similarly if two tables are connected via a foreign key, they are connected. 与此类似，如果两张表通过一个外键连接起来，我们也称其为连接的。

Create a relationship between the primary key and foreign key columns. 在主键列和外键列之间创建关系。

In the subscription table, this becomes a foreign key to a subscription schedule table. 在订阅表中，此字段成为指向订阅计划表的外键。

The source table cannot be referenced by a foreign key in another table. 另一个表的外键不能引用源表。

Use the Relationship connector to define a foreign key between two tables. 使用关系连接线可以在两个表之间定义外键。