对于第二个策略(每个类层次结构一个表)，您必须用检测约束定义您自己的完整性。

For our second strategy (one table per class hierarchy), you'll have to define your integrity using check constraints.

youdao

对于第二个策略(每个类层次结构一个表)，您必须用检测约束定义您自己的完整性。

For our second strategy (one table per class hierarchy), you'll have to define your integrity using check constraints.

youdao