# File lib/tapkit/access/sql.rb, line 800
                def sql_for_key_comparison_qualifier( qualifier )
                        left  = qualifier.left
                        right = qualifier.right
                        op    = qualifier.symbol

                        # operator
                        unless op == Qualifier::CI_LIKE then
                                op_str = sql_for_symbol(op, true) # second argument is dummy
                        end

                        left_str  = sql_for_attribute_named left
                        right_str = sql_for_attribute_named right

                        unless op == Qualifier::CI_LIKE then
                                "#{left_str} #{op_str} #{right_str}"
                        else
                                sql_for_case_insensitive_like(right_str, left_str)
                        end
                end