SELECT
    O.CUST_CODE AS CODE,
    CUST_NAME AS NAME,
    COUNT(ORDER_NO) AS CNT,
    SUM(ORDER_AMNT) AS TTL_AMT,
    ROUND(AVG(ORDER_AMNT),0) AS AVG_AMT
FROM
    ORDERS AS O
    INNER JOIN CUSTOMER AS C
        ON O.CUST_CODE=C.CUST_CODE
GROUP BY
    CODE, NAME
HAVING
    CNT >= 5
ORDER BY
    CNT DESC,
    AVG_AMT DESC,
    CODE ASC
LIMIT 5
;