You can join tables in Visual Analytics, but the recommendation is that you join tables outside of Visual Analytics and then use the joined table in the report. Data joins in Visual Analytics are really meant for data exploration. One of the reasons is that a data source join creates a temporary table every single time someone accesses the report.
Watch the live Hackathon Kickoff to get all the essential information about the SAS Hackathon—including how to join, how to participate, and expert tips for success.