Referential integrity for element relationships
元素关系的引用完整性
Primary key, referential integrity, and check constraints.
主键、引用完整性和检查约束。
However, the referential integrity would not have been enforced.
不过，参照完整性将得不到保证。
A foreign key is a constraint that enforces referential integrity.
外部索引键是强制使用参考完整性的条件约束。
For instance, complex data relationships would require full referential integrity enforcement.
比如，复杂的数据关系要求有完全的引用完整性限制。
For instance, complex data relationships would require full referential integrity enforcement.
比如，复杂的数据关系要求有完全的引用完整性限制。
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