INSERT INTO
    T_LS (FULLPATH, DIRNAME, LEVEL, FIRSTDETECTED, LASTVERIFIED)
    SELECT
        FULLPATH
        , DIRNAME
        , LEVEL
        , FIRSTDETECTED
        , LASTVERIFIED
    FROM
        T_LS_TMP
        left outer join T_LS on
            T_LS_TMP.FULLPATH=T_LS.FULLPATH
            and
            T_LS.LASTVERIFIED = (SELECT max(LASTVERIFIED) FROM T_LS)
    WHERE
        T_LS.FULLPATH IS NULL;