SQL statement - Display expected results

Question

I have this SQL statement:
SELECT DISTINCT ch.ch_status,cu.customer_id FROM contract co, contract_history ch, customer cu
      WHERE co.co_id = ch.co_id
      AND co.customer_id = cu.customer_id
      AND (cu.passportno= 'S1234567A' )
      AND cu.customer_id != 12345
      AND ch.ch_seqno in (SELECT MAX(ch_seqno) FROM contract_history WHERE co_id = co.co_id)
      and co.co_id IN (SELECT co_id FROM contract_history
      GROUP BY co_id HAVING(SUM(CASE WHEN ch_status = 'a' AND (ch_status = 'd' or ch_status = 's' or ch_status = 'o') THEN 1
                                WHEN ch_status = 'a' THEN 1
                                ELSE 0
                                END) > 0))
      ORDER BY decode(ch.ch_status,'d',1,'a',2,'s',3,'o',4)ASC;With the following results:
CH_STATUS     CUSTOMER_ID
   d                           100
   d                           200
   d                           300
   a                           100
   a                           200How am I suppose to amend my SQL statement in such a way the results will only display this?
Expected Results
CH_STATUS     CUSTOMER_ID
   d                       300
   a                       100
   a                       200Only the ch_status of 'a' will be displayed even though it has status 'd' too. However, if customer_id has only status 'd', it will be displayed.

Answer 1

i am not getting what u r trying to do....
once u have cursor you can use cursor...y u still need with clause,....
but yes its possible
QL>
SQL> Declare
  2   Cursor c1 Is
  3   With t As
  4  (
  5  Select 'd' CH_STATUS ,129 CUSTOMER_ID  From dual Union All
  6  Select 'd'           ,62031            From dual Union All
  7  Select 'd'           ,858347           From dual Union All
  8  Select 'a'           ,129              From dual Union All
  9  Select 'a'           ,62031            From dual
10  ) Select ch_status,customer_id
11    From
12  (
13   Select ch_status, customer_id,
14          Case When ch_status = 'd' And lag(ch_status) over (Partition By customer_id Order By ch_status) = 'a' Then 0 Else 1 End  new_status
15   From t
16   ) Where new_status = 1;
17 
18   r1 c1%Rowtype;
19  Begin
20  Open c1;
21  Loop
22  Fetch c1 Into r1;
23  Exit When c1%Notfound;
24   dbms_output.put_line(r1.CH_STATUS);
25  End Loop;
26  End;
27  /
a
a
d
PL/SQL procedure successfully completed
SQL>