rank nation gold silver bronze total
rank
nation
gold
silver
bronze
total
number
number
number
number
number
number text number number number number
1 nigeria 14 12 9 35
how long is the list of countries that won any medals ?
WRB JJ VBD-AUX DT NN IN NNS WDT VBD DT NNS .
14
Keyword Keyword Keyword Column Keyword Keyword Keyword Keyword Column Keyword Keyword
select count ( c2 ) from w where c6_number > 0
Keyword Keyword Keyword Keyword Keyword Keyword Column None Keyword Keyword Column None
['agg', 'agg_count'] ['agg', 'agg_count'] ['agg', 'agg_count'] ['agg', 'agg_count'] ['agg', 'agg_count'] ['agg', 'agg_count'] c2 ['comp', 'comp_greater'] ['comp', 'comp_greater'] c6_number