--Esempio Cursori Annidati
DECLARE
  V_NUMSPESE NUMBER := &NUMSPESE;

  --Primo Cursore: I migliori n clienti
  CURSOR C_BESTCLI(P_NUMSPESE IN NUMBER)
  IS
    SELECT
      AA.*
    FROM
      (
        SELECT
          CODFID,
          SUM(TOTALE) AS TOTVEND
        FROM
          SCONTRINI
        WHERE
          CODFID <> '-1'
        GROUP BY
          CODFID
        ORDER BY
          SUM(TOTALE) DESC
      )
    AA
  WHERE
    ROWNUM <= P_NUMSPESE;

  --Secondo Cursore: I dati di ciascun cliente
  CURSOR C_DATICLI(P_CODFID IN CLIENTI.CODFIDELITY%TYPE)
  IS
    SELECT
      A.CODFIDELITY,
      A.NOME
      || ' '
      || A.COGNOME AS NOMINATIVO,
      B.BOLLINI,
      B.ULTIMASPESA
    FROM
      CLIENTI A
    JOIN CARDS B
    ON
      A.CODFIDELITY = B.CODFIDELITY
    WHERE
      A.CODFIDELITY = P_CODFID FOR UPDATE;

BEGIN

  FOR R_BESTCLI IN C_BESTCLI(V_NUMSPESE)
  LOOP
    DBMS_OUTPUT.PUT_LINE(R_BESTCLI.CODFID || ' ' || R_BESTCLI.TOTVEND);

    FOR R_DATICLI IN C_DATICLI(R_BESTCLI.CODFID)
    LOOP
      DBMS_OUTPUT.PUT_LINE(R_DATICLI.CODFIDELITY || '|' || R_DATICLI.NOMINATIVO || ' | ' || R_DATICLI.BOLLINI || ' | '
      || R_DATICLI.ULTIMASPESA);
    END LOOP;

  END LOOP;
  COMMIT;
END;