主键、引用完整性和检查约束。

Primary key, referential integrity, and check constraints.

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元素关系的引用完整性

Referential integrity for element relationships

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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.

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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.

youdao