SELECT *
FROM (
  select data.dataid, data.name, DATA.NEW_DT, DATA.NEW_SUB_DT, MAX(OLD_DT) OLD_DT, MAX(OLD_SUB_DT) OLD_SUB_DT from (
    select  doc.dataid, doc.name,
            REGEXP_REPLACE(doc.NAME, ' *[\].*$','') NEW_DT,
            REGEXP_REPLACE(REGEXP_REPLACE(doc.NAME, '^[^\]*[\] *',''), ' *[\].*$', '') NEW_SUB_DT,
            decode(la.attrid, 15, la.valstr, null) OLD_DT,
            decode(la.attrid, 16, la.valstr, null) OLD_SUB_DT
    from  dtree doc
    join dtreeancestors da on doc.dataid = da.dataid and da.ancestorid = 304086 and doc.subtype = 144
    join llattrdata la on la.defid = 45942 and la.attrid in (15,16) and la.id = doc.dataid and la.vernum = doc.versionnum
  ) data
  group by data.dataid, data.name, DATA.NEW_DT, DATA.NEW_SUB_DT
) DATA 
WHERE DATA.NEW_DT <> DATA.OLD_DT OR DATA.NEW_SUB_DT <> DATA.OLD_SUB_DT OR DATA.OLD_DT IS NULL OR DATA.OLD_SUB_DT IS NULL
;