You can express uniqueness constraints based on certain attributes of child elements.
基于子元素的某些属性可以表示惟一性约束。
Simple examples include the typical name-uniqueness constraints, type checks or non-nullness.
简单的例子比如典型的名称唯一性约束、类型检查或非空检查。
I have a table that I would like to partition, but I don't know how to deal with the uniqueness constraints.
我有一个表，我想分区，但我不知道如何处理的唯一性约束。
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