SELECT
    EMP_CODE AS CODE
    , EMP_LAST_NAME AS SURNAME
    , EMP_FIRST_NAME AS NAME 
FROM
    EMP 
WHERE
    VALID_FLG = '1'
    AND REPLACE(EMP_LAST_NAME||EMP_FIRST_NAME, ' ', '') IN (
        SELECT
            REPLACE(EMP_LAST_NAME||EMP_FIRST_NAME, ' ', '') as NAME
        FROM
            EMP
        WHERE
            VALID_FLG = '1'
        GROUP BY
            NAME
        HAVING
            COUNT(*) >= 2
    )
ORDER BY
    REPLACE(EMP_LAST_NAME||EMP_FIRST_NAME, ' ', ''),
    CODE