In database theory, an OLAP cube is an abstract representation of the projection of a relation of an RDBMS (System Administrator relational databases). Given a relation of order N, we consider the possibility of a projection that has the X, Y, Z as the key to the relationship and attribute W as residual. Categorizing this as a function must be:
W: (X, Y, Z) → W
The attributes X, Y, Z axes correspond to the hub, while the W value returned by each triplet (X, Y, Z) corresponds to the data element to be filled in each cell of the cube.
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