Add and delete relationships between entities.
在实体间添加以及删除关系。
Create or Delete Relationships Between Work Items.
创建或删除工作项之间的关系。
When you redesign tables, it is often necessary to delete relationships and then recreate them after your new design is complete.
当重新设计资料表时，通常会需要删除关联性，然后在新的设计完成之后重新建立关联性。
This usually works fine, but if you have has_many relationships defined, you may trigger a cascading delete.
这通常会出色地完成，但是如果您定义了has_many关系，则有可能会触发级联(cascading)删除。
You can use table Designer to create, edit, or delete tables, columns, keys, indexes, relationships, and constraints.
可以使用表设计器创建、编辑或删除表、列、键、索引、关系和约束。
Referential integrity is a system of rules that ensure relationships between rows in related tables are valid and that you do not accidentally delete or change related data.
引用完整性是一种规则体系，这些规则可确保相关表中各行间关系的有效性，并确保不会意外删除或更改相关的数据。
Referential integrity is a system of rules that ensure relationships between rows in related tables are valid and that you do not accidentally delete or change related data.
引用完整性是一种规则体系，这些规则可确保相关表中各行间关系的有效性，并确保不会意外删除或更改相关的数据。
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