What is the qualifying end date when the qualifying start date is qualifying start date?
CREATE TABLE "summary_of_qualification" (
  "confederation" text,
  "teams_started" text,
  "teams_that_have_secured_qualification" text,
  "teams_that_can_still_qualify" text,
  "teams_that_have_been_eliminated" text,
  "remaining_places_in_finals" text,
  "total_places_in_finals" text,
  "qualifying_start_date" text,
  "qualifying_end_date" text
);
SELECT "qualifying_end_date" FROM "summary_of_qualification" WHERE "qualifying_start_date"='Qualifying start date';