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Is Subset ratio a natural consequence of associative model and implementation of its full outer join?

[COURSE]:
Load * Inline [
CourseId, Course
C1, Portuguese
C2, Math
C3,Algorithm
C4,Analyze
];

[STUDENT]:
Load * Inline [
Studend, StudendId
André, 1
Lis, 2
];

[CLASS]:
Load * Inline [
CourseId, StudendId
C3, 1
C2, 2
];

The model above show a simple case where it easy to see how associative model implements its association. So, how it works throught a full outer join, CLASS table resume all Ids of this model. So, I can say that:

Is Subset ratio a natural consequence of associative model and implementation of its full outer join?

 

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