rank nation gold silver bronze total
rank
nation
gold
silver
bronze
total
number
number
number
number
number
number text number number number number
1 brazil 45 33 36 114
south korea has how many more medals that north korea ?
NNP NNP VBD-AUX WRB JJ JJR NNS WDT NNP NNP .
10
select ( select c6_number from w where c2 = 'south korea' ) - ( select c6_number from w where c2 = 'north korea' )