Why did the manager who departed on August 1, 2008 leave?
CREATE TABLE "managerial_changes" (
  "team" text,
  "outgoing_manager" text,
  "date_outgoing" text,
  "reason_of_departure" text,
  "replaced_by" text,
  "date_of_replacement" text
);
SELECT "reason_of_departure" FROM "managerial_changes" WHERE "date_outgoing"='august 1, 2008';