# File lib/tapkit/access/sql.rb, line 224
                def join_expression
                        if @aliases.size == 1 then
                                return
                        end

                        @aliases.each do |path, another|
                                if relationship = @join_relationships[path] then
                                        relationship.joins.each do |join|
                                                _join_expression(relationship, join)
                                        end
                                end
                        end
                end