rank nation gold silver bronze total
rank
nation
gold
silver
bronze
total
first second
number
number
number
number
text text(text) number number number number
1 great britain (gbr) 2 1 2 5
how many countries won at least 2 medals in sailing ?
WRB JJ NNS VBD IN JJS CD NNS IN NN .
9
select count ( c2 ) from w where c6_number >= 2