In order to create a join, you need to have two or more tables visible in the Table Display Area.
To add more tables to create a join:
SQLWizard displays the Add Table dialog box.
There is a limit of 15 tables in a FROM clause when running against XDB Server or DB2. Adding more than this number of tables will generate an error when you attempt to run the query.
You can create nested SELECT statements that access many more tables than this limit. The limit applies to a single FROM clause.