How many more years did Sparkman serve in the Senate than in the House?
return Sparkman did serve in  the  Senate ;return Sparkman did serve in  the  House ;return years of #1 ;return years of #2 ;return number of  #3 ;return number of  #4 ;return difference of #5 and  #6
['select', 'select', 'project', 'project', 'aggregate', 'aggregate', 'arithmetic']