How many weeks did the single that entered the charts 14 september 2002 stay on the charts ?
CREATE TABLE "singles" (
  "title" text,
  "entered_chart_uk" text,
  "peak_position_uk" real,
  "weeks_on_chart_uk" real,
  "sent_to_c_beebies_album" text
);
SELECT COUNT("weeks_on_chart_uk") FROM "singles" WHERE "entered_chart_uk"='14 september 2002';