col : rank | nation | gold | silver | bronze | total row 1 : 1 | malaysia | 3 | 0 | 1 | 4 row 2 : 2 | indonesia | 1 | 3 | 2 | 6 row 3 : 3 | korea | 1 | 1 | 2 | 4 row 4 : 4 | thailand | 1 | 0 | 0 | 1 row 5 : 5 | chinese taipei | 0 | 1 | 2 | 3 row 6 : 6 | denmark | 0 | 1 | 0 | 1 row 7 : 7 | japan | 0 | 0 | 2 | 2 row 8 : 8 | india | 0 | 0 | 1 | 1 row 9 : 9 | spain | 0 | 0 | 1 | 1
which countries competed in the 2011 bwf world junior championships? of these countries, which have won gold? of these countries, which have won gold only once?
indonesia, korea, thailand
Rank Nation Gold Silver Bronze Total
of these countries, which have won gold only once?
1 Malaysia 3 0 1 4
2 Indonesia 1 3 2 6
3 Korea 1 1 2 4
4 Thailand 1 0 0 1
5 Chinese Taipei 0 1 2 3
6 Denmark 0 1 0 1
7 Japan 0 0 2 2
8 India 0 0 1 1
9 Spain 0 0 1 1
Indonesia Korea Thailand
of these countries, which have won gold only once? || of these countries, which have won gold? | which countries competed in the 2011 bwf world junior championships?