Does Chartio support Joins across Tables?

Yes. Chartio automatically detects foreign key relations between your tables when it imports your schema and joins are automatically built into your queries when dragging columns from related tables in the Data Explorer.

If there are no foreign keys in your Chartio schema—either because Chartio is unable to access them or they don't exist—you can manually specify the joins in the schema editor for your database. Read more about manually setting up foreign keys here.