SELECT
    O.CUST_CODE AS CODE
    ,C.CUST_NAME AS NAME
    ,COUNT(DISTINCT O.ORDER_DATE) AS CNT
FROM
    ORDERS AS O
LEFT OUTER JOIN
    CUSTOMER AS C
  ON O.CUST_CODE = C.CUST_CODE
WHERE
    O.ORDER_DATE BETWEEN '2023-07-01' AND '2023-07-31'
GROUP BY
    O.CUST_CODE
    ,C.CUST_NAME
ORDER BY
    CNT DESC
    ,CODE DESC;