CREATE TABLE "table1_19412902_1" (
  "pos" real,
  "member_association" text,
  "points_total_500" real,
  "clubs" real,
  "group_stage" real,
  "play_off" real,
  "afc_cup" real
);

Question: how many posiitions did saudi arabia land on
SQL: SELECT COUNT("pos") FROM "table1_19412902_1" WHERE "member_association"='Saudi Arabia';

Question: what is the play-off in group stage 4 and clubs is 12
SQL: SELECT "play_off" FROM "table1_19412902_1" WHERE "group_stage"=4 AND "clubs"=12;

Question: which group stage was there 0 play-offs and 12 clubs played in it
SQL: SELECT COUNT("group_stage") FROM "table1_19412902_1" WHERE "play_off"=0 AND "clubs"=12;

Question: which club in group stage 4 had member association iran
SQL: SELECT "clubs" FROM "table1_19412902_1" WHERE "group_stage"=4 AND "member_association"='Iran';