Table:
0
A
B
C
D
E
1
Year
Location
Gold
Silver
Bronze
2
1986
Seoul
South Korea
Japan
India
3
1994
Hiroshima
Japan
South Korea
Chinese Taipei
4
1998
Bangkok
South Korea
Malaysia
Thailand
5
2002
Busan
South Korea
Japan
China
6
2006
Doha
South Korea
Malaysia
Japan
7
2010
Guangzhou
South Korea
China
Malaysia

Questions and formulas:
Question: In what year(s) did South Korea win silver?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,D1="south korea"),1))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E7,D2:D7="south korea"),1))
Level: medium
Question: Which nation(s) won silver in Doha?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,B1="doha"),4))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E7,B2:B7="doha"),4))
Level: medium
Question: What was the first year that South Korea won gold and Malaysia won bronze?
Formula: MIN(FILTER(A1, (C1="south korea")*(E1="malaysia")))
Formula2: MIN(FILTER(A2:A7, (C2:C7="south korea")*(E2:E7="malaysia")))
Level: easy
Question: What country won gold in the year(s) that Chinese Taipei won bronze?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,E1="chinese taipei"),3))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E7,E2:E7="chinese taipei"),3))
Level: medium