Terms presented include: unique identifier and primary key A logical data model describes your model entities and how they relate to each other. Record Based Logical Models. By default, when you drop tables into the data source canvas in Tableau Desktop, you are working in the logical layer and can define relationships between logical tables. Doing so allows us to know the differences between the logical model and physical model. To open it, click on Switch Diagram on the navigation bar and then double click on the logical ERD to open it. The main difference between logical and physical data model is that logical data model helps to define the data elements and their relationships, while physical data model helps to design the actual database based on the requirements gathered during the logical data modelling. Instead of drawing a logical or physical model from scratch, use the synchronize feature to produce an initial ERD from its previous form (i.e. Let's compare the two ERDs. The table below compares the different features: Data flow diagrams (DFDs) are categorized as either logical or physical.A logical DFD focuses on the business and how the business operates.It describes the business events that take place and the data required and produced by each event. The model synchronization feature helps you maintain the traceability between conceptual, logical and physical model. Logical vs. Two types of data modeling are as follows: Logical modeling; Physical modeling; If you are going to be working with databases, then it is important to understand the difference between logical and physical modeling, and how they relate to one another. The three levels of data modeling, conceptual data model, logical data model, and physical data model, were discussed in prior sections.Here we compare these three types of data models. The new logical DFD can then model better functionality with the office’s data, such as personnel data or customer data and orders. The difference between a logical and a physical data model are hard to grasp at first, but once you see the difference it seems obvious. The physical model is extremely important since it supports the detailed functionality of the DBMS, including how it will save and retrieve data from the disk/storage. The physical data model provides a low-level concept that describes the details of how data is stored on the computer. Comparing Logical and Physical ERD with Visual Diff. There are not as many physical data models as logical data models, the most common one being the Unifying Model. Basically, data modeling serves as a link between business needs and system requirements. To delve deeper into Tableau’s new data model, we need to understand the difference between Logical and Physical tables. Let's open the logical ERD. Logical vs Physical Data Modeling. Physical Data Sources. Data Warehousing > Concepts > Data Modeling - Conceptual, Logical, And Physical Data Models. 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