How many of the patients who died did not die between the 24 hours and 30 days following surgery?
return patients who  died ;return #1 that died between the  24 hours and  30 days following surgery ;return number of  #1 ;return number of  #2 ;return the  difference of #3 and  #4
['select', 'filter', 'aggregate', 'aggregate', 'arithmetic']