# File lib/tapkit/access/sql.rb, line 748
                def sql_for_symbol( symbol, value )
                        case symbol
                        when Qualifier::EQUAL
                                if value.nil? then 'IS'
                                else               '='
                                end
                        when Qualifier::NOT_EQUAL
                                if value.nil? then 'IS NOT'
                                else               '<>'
                                end
                        when Qualifier::GREATER          then '>'
                        when Qualifier::GREATER_OR_EQUAL then '>='
                        when Qualifier::LESS             then '<'
                        when Qualifier::LESS_OR_EQUAL    then '<='
                        when Qualifier::LIKE             then 'LIKE'
                        else
                                raise ArgumentError, "Symbol #{symbol} is an unknown operator"
                        end
                end