Table: boston_marathon_winners
Columns: country
mens_open
womens_open
mens_wheelchair
womens_wheelchair
total

Question: How many are the total winners if 7 won the Men's Open?
SQL: SELECT "total" FROM boston_marathon_winners WHERE "mens_open" = 7

Question: How many won the Men's Open if the players are from Sweden?
SQL: SELECT COUNT("mens_open") FROM boston_marathon_winners WHERE "country" = 'Sweden'

Question: How many are the total winners from South Korea?
SQL: SELECT "total" FROM boston_marathon_winners WHERE "country" = 'South Korea'