外键
... 主键(Primary Key): 外键(foreign key): 值域(Domain): ...
外键约束
外键约束(foreign key):外键约束条件参照的是主表的一个或者多个字段的值,通常被外键参照的是主表的主键或者唯一键,当表存在是只能在表的外部定义外键约...
约束
Oracle使用索引实施PRIMARY KEY约束。 foreign key约束(可称引用约束):在关系数据库中表可通过公共列相关联,该规则控制必须维护的列之间的关系。
外健
foreign key(外健):一个表中的一个列或者多个列的集合,这些列匹配某些其他(也可能是同一个)表中的候选键.
用于发现外键的跨列分析。
Non-identifying optional foreign key relationship.非标识可选的外键关系。
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。
The foreign key constraint is applied when you save the table.当保存该表时应用外键约束.
Include foreign key columns as properties on entity types.将外键列作为属性包括在实体类型中.
A foreign key is a constraint that enforces referential integrity.外键是强制引用完整性的约束.
With independent associations, you cannot use the foreign key property.使用独立关联, 则不能使用外键属性.
The foreign key side is also denoted by a key symbol.外键方也由键符号表示.
A foreign - key constraint can implement referential integrity between parent and child tables.外部索引键条件约束可于父和子资料表之间实作参考完整性.
A foreign key constraint referencing this table was dropped or changed.已删除或更改了引用此表的外键约束.
Filters that are created for each foreign key or Boolean fields.可提供针对每个外键或针对布尔型字段创建的筛选器.
A foreign key constraint allows you to define referential integrity between a parent and child table.外键约束允许您定义父表和子表之间的引用完整性.
A primary key of a table can be a foreign key in any other table.主键的表可以是外键,在任何其他表.
Creating a relationship also creates a foreign - key constraint that is added to the child table.建立关联性的同时,也会建立要加入至子资料表的外部索引键条件约束.
With foreign key associations , you can use both Methods: To change create or modify relationships.通过外键关联, 可以使用两种方法更改创建或修改关系.
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.
Delete a foreign key constraint when you want to remove the requirement to enforce referential integrity.如果想要移除对强制引用完整性的要求,则可删除外键约束.
Creates both a relation and foreign key constraint ( see below for descriptions ).建立关联与外部索引键条件约束 ( 请参阅以下描述 ).