CREATE TABLE "heats" (
  "heat_rank" real,
  "lane" real,
  "swimmer" text,
  "country" text,
  "time" real,
  "overall_rank" text
);

Question: I want to know the highest heat rank for overall rank of t63 and time less than 25.47
SQL: SELECT MAX("heat_rank") FROM "heats" WHERE "overall_rank"='t63' AND "time"<25.47;

Question: Tell me the country for lane of 6
SQL: SELECT "country" FROM "heats" WHERE "lane"=6;

Question: Tell me the overall rank for heat rank of 8
SQL: SELECT "overall_rank" FROM "heats" WHERE "heat_rank"=8;