How many more yards did John Riggins rush in the Redskins game against the Vikings than he did in the game against the Dolphins?
return John Riggins ;return rushes of #1 ;return #2 in  the  Redskins game  against  the   Vikings ;return #2 in  the  game  against  the   Dolphins ;return yards of #3 ;return yards of #4 ;return sum of #5 ;return sum of #6 ;return the  difference of #7 and  #8
['select', 'project', 'filter', 'filter', 'project', 'project', 'aggregate', 'aggregate', 'arithmetic']