# File lib/tapkit/access/sql.rb, line 211
                def join_clause
                        if @join_entities.empty? then
                                return ''
                        end

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

                        unless @join_on.empty? then
                                clause << " ON #@join_on"
                        end

                        clause
                end