Achieving a higher level of abstraction requires that you be able to postpone specification of lower level detail without sacrificing consistency.

达到更高的抽象层次要求您能够在不牺牲一致性的情况下推迟较低层次的细节的规范。

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In the first case, the constraint specification is consistent; in the second case, no statement about consistency can be made.

在第一种情况下，约束规范是一致的，在第二种情况下，不能对一致性给出结论。

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Integrity in this case means consistency with the generated column specification.

本例中的完整性是指与生成列规范的一致性。

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