How many more yards was John Kasay's second field goal over his first?
return John Kasay ;return field goals of #1 ;return the  first of #2 ;return the  second of #2 ;return yards of #3 ;return yards of #4 ;return the  difference of #6 and  #5
['select', 'project', 'aggregate', 'project', 'project', 'project', 'arithmetic']