您可以根据该知识创建一组转换。

You can create a set of transformations based on that knowledge.

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执行那样复杂的一组转换的sql十分笨拙，难于维护。

The SQL required to perform such a complex set of transformations would prove unwieldy and difficult to maintain.

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MDD通常允许使用一组转换从一个抽象级别转换到另一个抽象级别。

MDD typically allows transformation from one level of abstraction to another using set transforms.

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