Logical Data Modeling - Set

Data System Architecture


A set in data modeling is a data structure that groups element (entity, value, relationship, …) in a aggregation relationship.

The original set data type contains generally unique value but in a database or relational concept, this concept has been extended to non-unique rows.



See Set Theory

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Data System Architecture
Logical Data Modeling - Duplicate

A duplicate happens when in a set two elements have an equivalence relationship that returns true. In the set {1,1,2,3}, 1 is a duplicate The set {1,2,3} has no duplicate relational operators...

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