rank name nationality result notes
rank
name
nationality
result
notes
number
number
number text text number text
4 huang qiuyan china 14.39 sb
what is the number of different nationalities represented by the top 5 athletes ?
WP VBD-AUX DT NN IN JJ NNS VBN IN DT JJ CD NNS .
4
select count ( distinct c3 ) from w where id <= 5