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;