WITH
MAIN AS
(
    SELECT 
        *
    FROM
        HOUSEHOLD
    WHERE
        PERSON_CODE <> '1'
    AND CLASS_CODE <> '01'
)
SELECT
    CLASS_NAME AS CLASS
,   PERSON_NAME AS PERSON
,   MAX(IFNULL(AMT, 0)) AS HOUSEHOLDS
FROM
    MAIN
GROUP BY
    CLASS_CODE
ORDER BY
    CLASS_CODE ASC