Note: This is a rewrite of several older posts (which now link here), to bring them into line with the McGoveran formalization and interpretation [1] of Codd's true RDM.
"You constantly remind us that the relational model is a logical model having no connection to any physical model (so I infer). You also indicate how no commercial product fully implements the relational model. Therefore, how do we make use of the relational model when dealing with the physical constructs of a commercial database program (Oracle, Access, DB2, etc.)?" --DBDebunk.com query