What 100 yard Backstroke has a 100 yard Freestyle of helen yee (sierra vista)?
CREATE TABLE "swimming_and_diving" (
  "combined" text,
  "50_yard_freestyle" text,
  "100_yard_freestyle" text,
  "200_yard_freestyle" text,
  "500_yard_freestyle" text,
  "100_yard_backstroke" text,
  "100_yard_butterfly" text
);
SELECT "100_yard_backstroke" FROM "swimming_and_diving" WHERE "100_yard_freestyle"='helen yee (sierra vista)';