Who was the outgoing manager of the team in 15th position that was sacked?
CREATE TABLE "during_regular_season" (
  "team" text,
  "outgoing_manager" text,
  "manner_of_departure" text,
  "date_of_vacancy" text,
  "replaced_by" text,
  "date_of_appointment" text,
  "position_in_table" text
);
SELECT "outgoing_manager" FROM "during_regular_season" WHERE "manner_of_departure"='Sacked' AND "position_in_table"='15th';