How many points against has team Cardiff had when there were less than 7 tries?
CREATE TABLE "pool_4" (
  "team" text,
  "tries_for" real,
  "tries_against" real,
  "try_diff" text,
  "points_for" real,
  "points_against" real,
  "points_diff" text
);
SELECT COUNT("points_against") FROM "pool_4" WHERE "team"='cardiff' AND "tries_against"<7;