rank nation gold silver bronze total
rank
nation
gold
silver
bronze
total
number
number
number
number
number
number text number number number number
1 canada 9 6 5 20
name the countries that did not win any gold medals .
VB DT NNS WDT VBD-AUX RB VB DT NN NNS .
Netherlands|Spain|Bulgaria|Great Britain|Sweden
select c2 from w where c3_number = 0