rank nation gold silver bronze total
rank
nation
gold
silver
bronze
total
number
number
number
number
number
number text number number number number
1 south korea 9 2 1 12
how many teams won more than 6 medals total ?
WRB JJ NNS VBD JJR IN CD NNS JJ .
4
select count ( c2 ) from w where c6_number > 6