How many more people ended up homeless because of the bombing raids compared to being killed?
return the  bombing raids ;return people that ended up homeless because of #1 ;return people that ended up being killed because of #1 ;return number of  #2 ;return number of  #3 ;return the  difference of #4 and  #5
['select', 'project', 'project', 'aggregate', 'aggregate', 'arithmetic']