zOs/SQL/UN2

SELECT TID150TST, COUNT(*)
    FROM
    (
         SELECT * FROM OA1T.TID150A1 WHERE TID150MD = 1115
       UNION ALL
         SELECT * FROM OA1T.TID150A1 WHERE TID150MD < 1115
                                         AND   TID150MD > 1110
    ) A
    GROUP BY TID150TST;