How many premio are there when "Artist of the Year" was the categoria?
CREATE TABLE "awards_and_nominations" (
  "a_o" real,
  "trabajo_nominado" text,
  "premio" text,
  "categor_a" text,
  "country" text,
  "resultado" text
);
SELECT COUNT("premio") FROM "awards_and_nominations" WHERE "categor_a"='Artist of the Year';