WHAT IS THE AVERAGE DATE OF RELEASE FOR THICKSKIN?
CREATE TABLE "studio_albums" (
  "date_of_release" real,
  "title" text,
  "label" text,
  "oricon_peak" real,
  "riaa_cert" text
);
SELECT AVG("date_of_release") FROM "studio_albums" WHERE "title"='thickskin';