创建与修改一对多关系 Create and modify one-to-many relationships 实施参照完整性 Enforce referential integrity 创建与修改查询 Create and modify queries ..
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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。
A relationship that does not enforce referential integrity appears as a thin line between the common fields supporting the relationship.
不实施参照完整性的关系在支持该关系的公共字段之间显示为细线。
If the line appears dotted, the DBMS does not enforce referential integrity for the relationship when rows are added or modified in the foreign-key table.
如果为点线，则当在外键表中添加或修改行时，DBMS不强制关系的引用完整性。
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