Linking Table Columns with JOINS 
Use
You can use the
Visual Query dialog to link table columns with JOINS* in database queries.Prerequisites
When you
created the Visual Query, you copied the tables containing the columns you want to link together to the area for selecting tables.Procedure

If you copy the same table to the table selection twice, SQL Studio assigns an alias name. In this way, you can create SELF JOINS.
For information on the syntax of JOINS, see the
JOIN predicate section of the Reference Manual: SAP DB.