What is an instance in the ER diagram
A view can be modeled by sub-views, which are combined with UNION, UNION ALL, INTERSECT or EXCEPT and brackets.
Sub-Select like View
As a select statement, a select is part of a union view or is used as a sub-select in expressions of view elements.
In a complete model there is an orthogonal ring with respect to the cube, its cube dimensions, and fact sets.
This means that the dimension of a cube dimension has a lowest dimension level that is linked to a dimension entity of the entity relationship model. This dimension entity is in turn referenced in a fact set using a foreign key relationship. And this set of facts is used by the cube via a from clause, so that the cube gets its key figures from the set of facts. The foreign attributes of the fact set are displayed in the cube as dimension attributes.
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