How many more touchdown passes did Donovan McNabb make over David Carr
return Donovan McNabb ;return David Carr ;return touchdown passes of #1 ;return touchdown passes of #2 ;return number of  #3 ;return number of  #4 ;return difference of #5 and  #6
['select', 'select', 'project', 'project', 'aggregate', 'aggregate', 'arithmetic']