IC电子辞典 第138页 ... DIR DIRectory 目录，索引薄，电话号码本 DIR DataIntegrityRules 数据完整性规则 DIR DifferentialInterfaceReceiver 微分界面接收器 ...
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更重要的是，您知道当对相关表执行 DML 操作时这些规则如何保护数据完整性吗？
More importantly, do you know how these rules work to safeguard data integrity when DML operations are performed against tables that are related?
以这种方式代替编写查询并处理它的优势在于：业务规则通过UI得以应用，所以保证了数据完整性。
The advantage of doing it this way rather than writing a query to handle it is that the business rules get applied via the UI so data integrity is ensured.
但是在您定义RI时，要记住，当对相关表执行dml操作时，需要一些规则来保护数据完整性。
But when you define ri constraints, keep in mind that there are rules in place to safeguard data integrity when DML operations are performed against related tables.
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