rank nation gold silver bronze total
rank
nation
gold
silver
bronze
total
number
number
number
number
number
number text number number number number
1 russia 8 12 10 30
how many nations won at least 10 silver medals ?
WRB JJ NNS VBD IN JJS CD NN NNS .
1
select count ( c2 ) from w where c4_number >= 10