Which Seat has a Season 6 of kevin o'leary?
CREATE TABLE "english_version" (
  "seat" real,
  "season_1" text,
  "season_2" text,
  "season_3" text,
  "season_6" text,
  "season_7" text
);
SELECT MAX("seat") FROM "english_version" WHERE "season_6"='kevin o''leary';