It's important to understand that each pageview has many, many attributes and that each one is stored in a different field or dimension.
理解这一点很重要：页面视图有很多很多的属性，每一个都存放在不同的字段或者维度里。
Partial Key Joins occur when there is an implicit many to many relationship between a dimension and a fact.
当一个维度和一个事实之间有一个隐式的多对多关系时会出现PartialKeyJoins。
Partial Key Joins occur when there is an implicit many to many relationship between a dimension and a fact.
当一个维度和一个事实之间有一个隐式的多对多关系时会出现PartialKeyJoins。
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