SELECT
    EMP_CODE,
    EMP_NAME,
    SEX,
    BIRTHDAY
FROM
    TBL_EMPLOYEES
WHERE
    (
        EMP_CODE <= 4
        OR SEX = "M"
    )
    AND
    (
        BIRTHDAY >= "1981-01-01"
        AND BIRTHDAY <= "1981-12-31"
    )
ORDER BY
    EMP_CODE ASC