这种数据结构约束的弱化要求根据需要强化应用程序逻辑中的约束。
This weakening of the data structure constraint requires the strengthening of constraints within the application logic as necessary.
这些限制在极大程度上是因为数据结构的复杂约束。
Most of these limits are subtle constraints based on data structures.
我所能获取的列太多，又很容易遗漏重要的结构化数据库特性，比如索引或空约束。
I can fetch too many columns, or leave off important structural database features, like indexes or null constraints.
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