CREATE TABLE "semifinal_2" (
  "rank" real,
  "lane" real,
  "name" text,
  "nationality" text,
  "time" text
);

Question: What lane has a time of 1:57.71?
SQL: SELECT SUM("lane") FROM "semifinal_2" WHERE "time"='1:57.71';

Question: Who had a larger rank than 3, less than 6 lanes, and a time of 1:58.15?
SQL: SELECT "name" FROM "semifinal_2" WHERE "rank">3 AND "lane"<6 AND "time"='1:58.15';