Sammenføjning af data fra 5 tabeller uden dublerede værdier og opnå resultat med tilpasset status i Oracle 10g

Du kan "rangere" forskellige statusser baseret på din logik og derefter vælge den seneste status ud af dem. Du kan bruge logikken, der ligner den nedenfor, som presser alle "afvisninger".

Sørg for, at du inkluderer alle andre mulige statusser, hvis du bekymrer dig om ordren for resten af ​​dem.

with t1 as
( select 1 id, 'Waiver Requested'        status from dual union all
  select 1 id, 'Rejected'        status from dual union all
  select 2 id, 'Waiver Requested'        status from dual union all
  select 2 id, 'Waiver Requested'        status from dual union all
  select 3 id, 'Rejected'                status from dual union all
  select 3 id, 'Rejected'                status from dual union all
  select 4 id, 'Waiver Requested'        status from dual union all
  select 4 id, 'Cancelled'               status from dual
)
select id,
       status,
       max(status) KEEP (DENSE_RANK FIRST
                         order by (case when status ='Rejected' then -1
                                            else 1
                                       end) desc)
          over (partition by id) final_status
  from t1

        ID STATUS           FINAL_STATUS
---------- ---------------- ----------------
         1 Waiver Requested Waiver Requested
         1 Rejected         Waiver Requested
         2 Waiver Requested Waiver Requested
         2 Waiver Requested Waiver Requested
         3 Rejected         Rejected
         3 Rejected         Rejected
         4 Waiver Requested Waiver Requested
         4 Cancelled        Waiver Requested