rank npc gold silver bronze total
rank
npc
gold
silver
bronze
total
number
first second
number
number
number
number
number text(text) number number number number
1 china (chn) 95 71 65 231
what is the difference between the gold medals won by china and its total medal winnings ?
WP VBD-AUX DT NN IN DT NN NNS VBN IN NNP CC PRP$ JJ NN NNS .
136
select c6_number - c3_number from w where c2_first = 'china'