# File lib/tapkit/access/adapters/openbase.rb, line 535
                def join_clause
                        if @join_entities.empty? then
                                return ''
                        end

                        clause = ''
                        @join_entities.each do |entity|
                                name    = entity[0].external_name
                                another = entity[1]
                                clause << ", #{name} #{another}"
                        end

                        clause
                end