This document discusses self joins in Microsoft Access. A self join joins a table to itself to show hierarchical relationships like parts lists or employee managers. The presentation shows how to create a query that lists employees along with their managers by joining the Employees table to itself. It demonstrates adding the Employees table twice to the query designer, giving one an alias of "Managers", and creating an outer join between the tables on the EmpNo and MgrNo fields to return results even if an employee has no manager. The results of the sample query on the provided Employees table are shown.