CREATE TABLE "squad_information" (
  "nat" text,
  "name" text,
  "since" real,
  "goals" real,
  "transfer_fee" text
);

Question: Name the total number of since for belletti
SQL: SELECT COUNT("since") FROM "squad_information" WHERE "name"='belletti';

Question: Name the highest goals for youth system and ita
SQL: SELECT MAX("goals") FROM "squad_information" WHERE "nat"='ita' AND "transfer_fee"='youth system';