How many more households were there in 2010 compared to families residing in the city?
return the  city ;return households of #1 ;return #2 in  2010 ;return families of #1 ;return #4 in  2010 ;return number of  #3 ;return number of  #5 ;return difference of #6 and  #7
['select', 'project', 'filter', 'project', 'filter', 'aggregate', 'aggregate', 'arithmetic']