What is the average Yards with an average of less than 4 and the long is 12 with less than 29 attempts?
CREATE TABLE "rushing" (
  "player" text,
  "attempts" real,
  "yards" real,
  "average" real,
  "long" real,
  "touchdowns" real
);
SELECT AVG("yards") FROM "rushing" WHERE "average"<4 AND "long"=12 AND "attempts"<29;