Question: What year did Dave F. McTaggart win the men's singles and Robert B. Williams Ethel Marshall win the mixed doubles?
SQL: SELECT MAX("Year") FROM "2-12552861-1" WHERE "Men's singles" = 'Dave F. McTaggart' AND "Mixed doubles" = 'Robert B. Williams Ethel Marshall';

Question: Who won the women's singles before 1958 when Dave F. McTaggart won the men's singles?
SQL: SELECT "Women's singles" FROM "2-12552861-1" WHERE "Men's singles" = 'Dave F. McTaggart' AND "Year" < 1958.0;

Question: Who won the men's singles in 1958?
SQL: SELECT "Men's singles" FROM "2-12552861-1" WHERE "Year" = 1958.0;

Question: Who won the mixed doubles in 1957 when Judy Devlin won the women's singles?
SQL: SELECT "Mixed doubles" FROM "2-12552861-1" WHERE "Women's singles" = 'Judy Devlin' AND "Year" = 1957.0;