Last Modified Date: 26 Aug 2019
Option 1Starting with Tableau Desktop 10.2, the ability to customize joins using calculations was added to the product to resolve format mismatches between fields. For more information, see Join Your Data.
Option 2For earlier Tableau Desktop versions, the ability to join on calculated fields was not built into Tableau Desktop. When tables or data sources are joined, a query reflecting the join is sent to the data source. Calculated Fields exist at the workbook level, not the data source level.
Try one of the following workarounds:
Additional InformationNot all data sources are available for cross-database joins. For more information, see Combine tables from different databases.
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