Relationships canvas in the Data Source page In this example, the Book logical table is made of three, joined physical tables (Book, Award, Info).
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Physical tables can be combined using joins or unions. They act like containers for physical tables.ĭouble-click a logical table to open it and see its physical tables. Logical tables can be combined using relationships (noodles). The top-level view of a data source with multiple, related tables. Double-click a logical table to view or add joins and unions. Think of the physical layer as the Join/Union canvas in the Data Source page. Each logical table contains at least one physical table in this layer. You combine data between tables at the physical layer using joins (Link opens in a new window) and unions. For more information, see Use Relationships for Multi-table Data Analysis. Think of this layer as the Relationships canvas in the Data Source page.
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You combine data in the logical layer using relationships (or noodles).
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A data model can be simple, such as a single table. The tables that you add to the canvas in the Data Source page create the structure of the data model. You can think of a data model as a diagram that tells Tableau how it should query data in the connected database tables. Every data source that you create in Tableau has a data model.