What is Date of Appointment, when Outgoing Manager is "Giray Bulak"?
CREATE TABLE "managerial_changes" (
  "team" text,
  "outgoing_manager" text,
  "manner_of_departure" text,
  "date_of_vacancy" text,
  "replaced_by" text,
  "date_of_appointment" text
);
SELECT "date_of_appointment" FROM "managerial_changes" WHERE "outgoing_manager"='giray bulak';