Question: What year did Carolina Marin win the Women's singles?
SQL: SELECT "Year" FROM "2-12152481-1" WHERE "Women's singles" = 'Carolina Marin';

Question: Who won the Mixed Doubles in 2007?
SQL: SELECT "Mixed doubles" FROM "2-12152481-1" WHERE "Year" = '2007';

Question: Who won the Mixed doubles when Juliane Schenk won the Women's Singles?
SQL: SELECT "Mixed doubles" FROM "2-12152481-1" WHERE "Women's singles" = 'Juliane Schenk';