Print report through 2 servers

Question

dear sirs,
I have report run on 2 servers by database link, and i want to make parameter to let me print from server1, or print the report from server 2
and this the query of the report
select system_type,tran_type,tran_no1,lpad(tran_no1,15,'0') ord_tran,tran_no2,tran_date,cus_no,curr_code,
debit,credit,dis_date,due_date,tran_no,tr_desc,rate,l_debit,l_credit,'s1' server1
from cust_tran
where tran_year = :wyear
and ((curr_code is null )
or(curr_code between :wcur1 and :wcur2))
and cus_no between :wcus1 and :wcus2
and tran_date between :wdate1 and :wdate2
union all select distinct -1,'-1','-1','-000000000000001',null,to_date('01-01-1000','dd-mm-yyyy'),cus_no,
curr_code,0,0,to_date('01-01-1000','dd-mm-yyyy'),
to_date('01-01-1000','dd-mm-yyyy'),'0','0',-1,0,0,'s1' from cust_bal
where year = :wyear
and cus_no between :wcus1 and :wcus2
and ((curr_code is null )
or(curr_code between :wcur1 and :wcur2))
and ( nvl(c_tr_deb,0) > 0 or nvl(c_tr_cr,0) >0 or nvl(c_op_deb,0) > 0 or nvl(c_op_cr,0) > 0)
--order by 7,8,6,4
union all
select system_type,tran_type,tran_no1,lpad(tran_no1,15,'0') ord_tran,tran_no2,tran_date,cus_no,curr_code,
debit,credit,dis_date,due_date,tran_no,tr_desc,rate,l_debit,l_credit,'s2'
from [email protected]
where tran_year = :wyear
and ((curr_code is null )
or(curr_code between :wcur1 and :wcur2))
and cus_no between :wcus1 and :wcus2
and tran_date between :wdate1 and :wdate2
union all select distinct -1,'-1','-1','-000000000000001',null,to_date('01-01-1000','dd-mm-yyyy'),cus_no,
curr_code,0,0,to_date('01-01-1000','dd-mm-yyyy'),
to_date('01-01-1000','dd-mm-yyyy'),'0','0',-1,0,0,'s2' from [email protected]
where year = :wyear
and cus_no between :wcus1 and :wcus2
and ((curr_code is null )
or(curr_code between :wcur1 and :wcur2))
and ( nvl(c_tr_deb,0) > 0 or nvl(c_tr_cr,0) >0 or nvl(c_op_deb,0) > 0 or nvl(c_op_cr,0) > 0)
order by 7,8,6,4
Please help me
Yasser

Answer 1

The only difference between this query (I'll refer to it as query1)
select system_type,tran_type,tran_no1,lpad(tran_no1,15,'0') ord_tran,tran_no2,tran_date,cus_no,curr_code,
debit,credit,dis_date,due_date,tran_no,tr_desc,rate,l_debit,l_credit,'s1' server1
from cust_tran
   where   tran_year = :wyear
       and  ((curr_code is null )
               or(curr_code between :wcur1  and :wcur2))
       and cus_no          between :wcus1  and :wcus2
       and tran_date       between :wdate1 and :wdate2
union all select distinct -1,'-1','-1','-000000000000001',null,to_date('01-01-1000','dd-mm-yyyy'),cus_no,
                     curr_code,0,0,to_date('01-01-1000','dd-mm-yyyy'),
                    to_date('01-01-1000','dd-mm-yyyy'),'0','0',-1,0,0,'s1' from cust_bal
   where   year = :wyear
       and cus_no          between :wcus1  and :wcus2
       and  ((curr_code is null )
               or(curr_code between :wcur1  and :wcur2))
       and ( nvl(c_tr_deb,0) > 0 or nvl(c_tr_cr,0) >0 or nvl(c_op_deb,0) > 0 or nvl(c_op_cr,0) > 0)
--order by 7,8,6,4and the query selecting from your remote database (I'll refer to it as query2)
select system_type,tran_type,tran_no1,lpad(tran_no1,15,'0') ord_tran,tran_no2,tran_date,cus_no,curr_code,
debit,credit,dis_date,due_date,tran_no,tr_desc,rate,l_debit,l_credit,'s2'
from [email protected]
   where   tran_year = :wyear
       and  ((curr_code is null )
               or(curr_code between :wcur1  and :wcur2))
       and cus_no          between :wcus1  and :wcus2
       and tran_date       between :wdate1 and :wdate2
union all select distinct -1,'-1','-1','-000000000000001',null,to_date('01-01-1000','dd-mm-yyyy'),cus_no,
                     curr_code,0,0,to_date('01-01-1000','dd-mm-yyyy'),
                    to_date('01-01-1000','dd-mm-yyyy'),'0','0',-1,0,0,'s2' from [email protected]
   where   year = :wyear
       and cus_no          between :wcus1  and :wcus2
       and  ((curr_code is null )
               or(curr_code between :wcur1  and :wcur2))
       and ( nvl(c_tr_deb,0) > 0 or nvl(c_tr_cr,0) >0 or nvl(c_op_deb,0) > 0 or nvl(c_op_cr,0) > 0)
order by 7,8,6,4is the usage of the database link which selects the data from the remote database. Now you want a parameter so that only data from query1 is returned or data from query2 is returned. When you run query1 against your remote database it should give you the same results as when you are running query2 to your current database (which is accessing your remote database via database link).
So why don't you
- dump query2
- run query1 against db1 when you want data from db1 (=the parameter you want to pass is set to a value that only query1 returns data but query2 does not)
- run query1 against db2 when you want data from db2 (=the parameter you want to pass is set to a value that only query2 returns data but query1 does not)
cheers