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。
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。
Referential integrity for element relationships
元素关系的引用完整性
Referential integrity for element relationships
元素关系的引用完整性
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