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1·Foreign key definitions in the DDL.

DDL中的外码定义。

2·Cross-column analysis for foreign key discovery.

用于发现外键的跨列分析。

3·Non-identifying optional foreign key relationship.

非标识可选的外键关系。

4·Non-identifying one-to-one foreign key relationship.

非标识一对一外键关系。

5·Creating a foreign key constraint with index disabled.

创建一个索引禁用的外键约束。

6·It is similar to a foreign key in a relational database.

它类似于关系数据库中的外键。

7·Alternative way of creating a primary key and foreign key.

另外一种创建主键和外键的方式。

8·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。

9·A foreign key attribute, is automatically created in PROJECT.

在PROJECT中会自动创建一个外键属性COMP _ CODE。

10·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。