How many more yards in field goals were there in the first half compared to touchdowns in the first half?
return field goals ;return #1 in   the  first half  ;return yards of #2 ;return sum of #3 ;return touchdowns ;return #5 in   the  first half  ;return yards of #6 ;return sum of #7 ;return difference of #4 and  #8
['select', 'filter', 'project', 'aggregate', 'select', 'filter', 'project', 'aggregate', 'arithmetic']