rank nation gold silver bronze total
rank
nation
gold
silver
bronze
total
number
first second
number
number
number
number
number text(text) number number number number
1 chinese taipei (tpe) 2 0 0 2
how many countries have at least one gold medal ?
WRB JJ NNS VBD-AUX IN JJS CD NN NN .
3
select count ( c2 ) from w where c3_number >= 1