What is the heat number at 7.63, and a reaction less than 0.229?
CREATE TABLE "semifinals" (
  "heat" real,
  "lane" real,
  "name" text,
  "country" text,
  "mark" text,
  "react" real
);
SELECT COUNT("heat") FROM "semifinals" WHERE "mark"='7.63' AND "react"<0.229;