What's the largest pick number for corrie d'alessio with a rd number over 6?
CREATE TABLE "list_of_vancouver_canucks_draft_picks" (
  "rd_num" real,
  "pick_num" real,
  "player" text,
  "team_league" text,
  "reg_gp" real,
  "pl_gp" real
);
SELECT MAX("pick_num") FROM "list_of_vancouver_canucks_draft_picks" WHERE "player"='corrie d''alessio' AND "rd_num">6;