Every data source that you create in Tableau has a 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. The tables that you add to the canvas in the Data Source page create the structure of the data model. Or it can be more complex, with multiple tables that use different combinations of relationships, joins, and unions.Ī data model can be simple, such as a single table. The default view that you first see in the Data Source page canvas is the logical layer of the data source.You combine data in the logical layer using relationships (or noodles). Think of this layer as the Relationships canvas in the Data Source page. ![]() For more information, see Use Relationships for Multi-table Data Analysis. You combine data between tables at the physical layer using joins (Link opens in a new window) and unions. Each logical table contains at least one physical table in this layer. Think of the physical layer as the Join/Union canvas in the Data Source page. CHICAGO MaFourKites ® and Cardinal Health (NYSE: CAH) announced today a global partnership to enhance tracking of medical equipment, pharmaceutical products, first aid supplies and personal protective equipment (PPE) in transit to hospitals, pharmacies and other care facilities worldwide. Double-click a logical table to view or add joins and unions. The top-level view of a data source with multiple, related tables. ![]() Logical tables can be combined using relationships (noodles). They act like containers for physical tables.ĭouble-click a logical table to open it and see its physical tables. Physical tables can be combined using joins or unions. Relationships canvas in the Data Source page In this example, the Book logical table is made of three, joined physical tables (Book, Award, Info).
0 Comments
Leave a Reply. |