How many more field goals did Sebastian Janikowski score than Longwell?
return Sebastian Janikowski ;return Longwell ;return field goals scored of #1 ;return field goals scored of #2 ;return number of  #3 ;return number of  #4 ;return the  difference of #5 and  #6
['select', 'select', 'project', 'project', 'aggregate', 'aggregate', 'arithmetic']