SELECT usr.tus_cod_usr AS "COD USUARIO",
       usr.tus_fec_ult_con AS "ULTIMA CONEXAO SAT",
       ADD_MONTHS(usr.tus_fec_ult_con, 18) AS "DATA INATIVACAO"
FROM tab_user usr
WHERE usr.tus_orig_usr IN (1,4,5)
AND usr.tus_status=1
AND MONTHS_BETWEEN(SYSDATE, usr.tus_fec_ult_con) > 17
AND MONTHS_BETWEEN(SYSDATE, usr.tus_fec_ult_con) < 18
ORDER BY usr.tus_fec_ult_con DESC;