无损加盟物业 [英] Lossless Join Property

问题描述

有人可以向我解释关系模式中的无损连接属性是什么意思吗?

Can someone please explain to me what is meant by the lossless join property in a relation schema?

在规范化的关系分解过程中是否能够维持信息/数据的语义?

Is it the ability to maintain the semantics of information/data during the decomposition of relations whilst normalising?

推荐答案

@Falcon-您是对的-但这是一个更实质性的定义...

@Falcon - you are right - but this is a more substantial definition...

无损连接属性是归一化支持的分解功能.这样可以确保可以从较小关系中的相应实例中识别出原始关系的任何实例.

The lossless join property is a feature of decomposition supported by normalisation. It is the ability to ensure that any instance of the original relation can be identified from corresponding instances in the smaller relations.

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