CREATE TABLE "semifinal_a_b_2" (
  "rank" real,
  "rowers" text,
  "country" text,
  "time" text,
  "notes" text
);

Question: What is the rank of the time of 6:30.53?
SQL: SELECT COUNT("rank") FROM "semifinal_a_b_2" WHERE "time"='6:30.53';

Question: What is the names of the rowers that the time was 6:24.61?
SQL: SELECT "rowers" FROM "semifinal_a_b_2" WHERE "time"='6:24.61';

Question: What country has a rank smaller than 6, a time of 6:32.32 and notes of FB?
SQL: SELECT "country" FROM "semifinal_a_b_2" WHERE "rank"<6 AND "notes"='fb' AND "time"='6:32.32';