Relational complexity includes horizontal and hierarchical complexity; Representational complexity includes width and depth of representation.
关系复杂性包括水平复杂性和等级复杂性，表征复杂性相应地包括表征广度和表征深度。
If the change is to the relational storage of the data itself, however, then suddenly you're in a whole new world of complexity, so much so that an entire book has been written on the subject.
但是，如果更改发生在数据的关系存储本身上，那么就突然进入一个全新的、复杂的领域，这个专题复杂到足够写一本书。
When you start to get into even intermediate complexity in your relational database, you'll design things differently than you would with an object model.
即便是中等复杂程度的关系数据库，设计的东西也和对象模型不同。
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