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
which nations have won only one medal ?
WDT NNS VBD-AUX VBN RB CD NN .
Rwanda|Zimbabwe|Seychelles
select c2 from w where c6_number = 1