How many yards longer was Jeff Wilkins' total yards of field goals than John Kasay's one?
return Jeff Wilkins ;return field goals of #1 ;return yards  of #2 ;return sum of #3 ;return John Kasay ;return field goal of #5 ;return yards  of #6 ;return difference of #4 and  #7
['select', 'project', 'project', 'aggregate', 'select', 'project', 'project', 'arithmetic']