SELECT
    elemArt
    , elemID
    , name
FROM
    (
        SELECT
            elemArt
            , elemID
            , name
            , elemTyp
        FROM
            STW11
        UNION
        SELECT
            elemArt
            , elemID
            , name
            , elemTyp
        FROM
            STW22
    )
WHERE
    elemTyp=20111