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 13 5 6 24
which nation won more gold medals than south africa ?
WDT NN VBD RBR JJ NNS IN NNP NNP .
Nigeria
select c2 from w where c3_number > ( select c3_number from w where c2 = 'south africa' )