CREATE TABLE "heat_4" (
  "rank" real,
  "lane" real,
  "athlete" text,
  "nationality" text,
  "time" real,
  "react" real
);

Question: What's Brazil's lane with a time less than 21.15?
SQL: SELECT MIN("lane") FROM "heat_4" WHERE "nationality"='brazil' AND "time"<21.15;

Question: What's Russia's lane when they were ranked before 1?
SQL: SELECT MAX("lane") FROM "heat_4" WHERE "nationality"='russia' AND "rank"<1;

Question: What's Bulgaria's lane with a time more than 21.55?
SQL: SELECT SUM("lane") FROM "heat_4" WHERE "nationality"='bulgaria' AND "time">21.55;