What is the maximum goals conceded for a team with 2 draws, more than 29 goals and a diff larger than 15?
CREATE TABLE "clausura_2006_standings" (
  "place_posici_n" real,
  "team_equipo" text,
  "played_pj" real,
  "won_pg" real,
  "draw_pe" real,
  "lost_pp" real,
  "goals_scored_gf" real,
  "goals_conceded_gc" real,
  "dif" real,
  "points_pts" real
);
SELECT MAX("goals_conceded_gc") FROM "clausura_2006_standings" WHERE "draw_pe"=2 AND "goals_scored_gf">29 AND "dif">15;