Table: doris_hart_tournaments
Columns: tournament
1940
1941
1942
1943
1944
1945
1946_1
1947_1
1948
1949
1950
1951
1952
1953
1954
career_sr

Question: What is the 1944 result for the U.S. Championships?
SQL: SELECT "1944" FROM doris_hart_tournaments WHERE "tournament" = 'u.s. championships'

Question: What is the tournament that had a result of A in 1954 and NH in 1942?
SQL: SELECT "tournament" FROM doris_hart_tournaments WHERE "1954" = 'a' AND "1942" = 'nh'