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Does ArcGIS Online support joins and relates?
Relating tables, via relationship classes, may be performed in ArcMap and then published as a service. Related records may then be displayed in pop-up windows in ArcGIS Online.
Depending on how the relationship class is created, users are able to add or update features and have the related data be updated in the pop-up as well.
However, related tables cannot natively be created in ArcGIS Online, and the in-memory joins or relates are not supported in a feature service.
Temporary joins are not visible in ArcGIS Online. Joins from Join Fields persist in ArcGIS Online as the fields are permanently appended to the table.