CREATE TABLE "singles" (
  "tournament" text,
  "1940" text,
  "1941" text,
  "1942" text,
  "1943" text,
  "1944" text,
  "1945" text,
  "1946_1" text,
  "1947_1" text,
  "1948" text,
  "1949" text,
  "1950" text,
  "1951" text,
  "1952" text,
  "1953" text,
  "1954" text,
  "career_sr" text
);

Question: What is the 1944 result for the U.S. Championships?
SQL: SELECT "1944" FROM "singles" 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 "singles" WHERE "1954"='a' AND "1942"='nh';