How many more touchdown passes did Carson Palmer make over J. P. Losman?
return Carson Palmer ;return J. P. Losman ;return touchdown passes of #1 ;return touchdown passes of #2 ;return number of  #3 ;return number of  #4 ;return the  difference of #5 and  #6
['select', 'select', 'project', 'project', 'aggregate', 'aggregate', 'arithmetic']