How many release dates have a Country of west germany, and a Release format of vinyl?
CREATE TABLE "release_history" (
  "release_format" text,
  "country" text,
  "label" text,
  "cat_no" text,
  "release_date" real
);
SELECT COUNT("release_date") FROM "release_history" WHERE "country"='west germany' AND "release_format"='vinyl';