CREATE TABLE "semifinals" (
  "heat" real,
  "lane" real,
  "name" text,
  "country" text,
  "mark" text
);

Question: What is the lowest heat for the United states with a mark of 51.85 pb and lane higher than 6?
SQL: SELECT MIN("heat") FROM "semifinals" WHERE "country"='united states' AND "mark"='51.85 pb' AND "lane">6;

Question: What is the average lane racheal nachula has when the heat is less than 2?
SQL: SELECT AVG("lane") FROM "semifinals" WHERE "heat"<2 AND "name"='racheal nachula';

Question: What is the average heat that has 52.83 sb mark and lane less than 4?
SQL: SELECT AVG("heat") FROM "semifinals" WHERE "mark"='52.83 sb' AND "lane"<4;