How many more town residents were full-time employment than part time employment?
return residents in  the  town ;return #1 that were in  full-time employment  ;return #1 that were in  part time employment  ;return number of  #2 ;return number of  #3 ;return the  difference of #4 and  #5
['select', 'filter', 'filter', 'aggregate', 'aggregate', 'arithmetic']