Question: Who won the mixed doubles the same year that Andrew Downes won the men's singles?
SQL: SELECT "Mixed doubles" FROM "2-12236643-1" WHERE "Men's singles" = 'Andrew Downes';

Question: Who won the mixed doubles in the years that the men's doubles has No competition?
SQL: SELECT "Mixed doubles" FROM "2-12236643-1" WHERE "Men's doubles" = 'No competition';