Regardless of the amount of effort that has been applied in planning and building a model, it is likely that it will be required to answer a question that has not been anticipated. In this situation, the model must be queried.
Throughout this book, we have separated the concepts of the tabular model from the client tool that queries the model. This is because the client interprets the model and displays it to the user under a defined set of assumptions. Moreover, because the tabular model supports MDX (multidimensional) queries, the representation of the tabular model in most client tools is that of the multidimensional model (actually, Microsoft does not currently have a browser-style interface to query tabular models).
Because most client tools (including SQL Server Management Studio) show the tabular model in a multidimensional style, querying the tabular model with DAX can be extremely difficult because you cannot see the underlying tabular schema (and therefore, do not know...