Table of Content

Tableau can support two type of data sources: from a file(local PC), from a server(from Web)
By default, Tableau maintains a live connection to your data, so as new source data is added, it can be incorporated into your analysis. A live connection is a direct connection to your data, while a Tableau data extract is a compressed snapshot of data stored locally and loaded into memory.

Relationships are a dynamic, flexible way to combine data from multiple tables for analysis.
When relating tables, the fields that define the relationships must have the same data type.
The first table that you drag to the canvas becomes the root table for the data model in your data source.
You can connect to many data sources to build your relationships. If there is a common field name between the tables involved, then it doesn’t matter if those tables are located in one data source or in different data sources.
You can't edit relationships after publishing a data source.
Relationships can be published.
Relationships are computed locally.
You can't define new relationships between published data sources.
Relationships can't be joined on Geographical fields/Calculated Fields.