What is the sum of losses when wins is more than 6, club is camperdown and against is more than 1238?
CREATE TABLE "1937_ladder" (
  "club" text,
  "wins" real,
  "losses" real,
  "draws" real,
  "against" real
);
SELECT SUM("losses") FROM "1937_ladder" WHERE "wins">6 AND "club"='camperdown' AND "against">1238;