![]() ![]() For example, a relationship across data sources will produce a cross-database join when the viz uses fields from tables in different data sources. Note: Relationships eventually leverage joins (just behind the scenes). However, there may be times when you want to directly establish a join, either for control or for desired aspects of a join compared to a relationship, such as deliberate filtering or duplication. ![]() ![]() For more information, see How Relationships Differ from Joins. Relationships are the recommended method of combining data in most instances. Relationships also allow for context-based joins to be performed on a sheet-by-sheet basis, making each data source more flexible. Relationships preserve the original tables’ level of detail when combining information. The default method in Tableau Desktop is to use relationships. Depending on the structure of the data and the needs of the analysis, there are several ways to combine the tables. It is often necessary to combine data from multiple places-different tables or even data sources-to perform a desired analysis. ![]()
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