How to handle Group by clause Dynamically in Oracle Form

Question

Hi Expert,
Here i have problem :
i want display record with passing group by clause Parameter
Example :
Select zone,district,postal,count(Do_no) ,sum(Sales_Amt)
from DLV_ORD_mast
group by :zone,:district,:Postal
1-o/p like :
if user pass the :zone parameter in group by clause then record display like below o/p
zone count sls_amt
South 2 1000
central 3 5000
East 4 600
2-o/p
if use pass the :District parameter in group by clause then record display like below O/P
zone count sls_amt
South/Dist1 2 1000
central /Dist2 3 5000
central /Dist3 1 500
East /Dist4 4 600
2-o/p
if use pass the :postal parameter in group by clause then record display like below O/P
zone count sls_amt
South/Dist1/postal1 2 1000
central /Dist2/Postal2 3 5000
central /Dist3/postal3 1 500
East /Dist4/postal4 4 600
so if anybody come across same senario then Please give me the solution for this problem .
pleassssssssssssssssssssssssss
Thanks
Abhishek

Answer 1

Build a block one a Query FROM clause, like
SELECT GROUPCOL,
       CNT,
       SUMM
  FROM (Select zone GROUPCOL,
               count(Do_no) CNT,
               sum(Sales_Amt) SUMM
          from DLV_ORD_mast
         group by zone
)Then at runtime, change the the block QUERY_DATASOURCE_NAME by SET_BLOCK_PROPERTY depending on the parameter, e.g. to
SELECT GROUPCOL,
       CNT,
       SUMM
  FROM (Select zone ||', '|| DISTRICT GROUPCOL,
               count(Do_no) CNT,
               sum(Sales_Amt) SUMM
          from DLV_ORD_mast
         group by zone ||', '|| DISTRICT
)