PL/SQL Cartridge with Union Query

Question

I have a pl/sql cartridge, with 3 select queries connected to each other by a "union". These queries basically generate a report from two tables. One of those queries is based on Table 1, and the other two are based on Table 2. What I need to accomplish is that I want to add a condition that restricts the outcome of the query (all three unions as a whole) based on a condition. Say, the condition is table1.param1 = '1'. Now, I'm getting confused with incorporating this condition in query 2 and query 3 which are based on table 2, and don't have the param1. However, both table1 and table 2 have param2 in common. I tried writing something like: (this is just a skeleton of my code)
SELECT param1, PARAM2, OTHER_PARAM
FROM table1
where param1 = '1'
union
select param2, param3, 0 other_param
from table2
where param2 in
(select param2
from table1
where param1 = '1')
union
select param2, param4, param5 other_param
from table2
where param2 in
(select param2
from table1
where param1 = '1');but this doesn't work. Can anyone help me with this query? any help is appreciated.

Answer 1

I think it will help you guys better if I illustrate in more detail. Posting my code below. p1,p2,p3..etc are parameter names. Hope someone will be able to help now.
The original code, before adding the new condition is:
select p1_num,
          p2_date,
          sum(decode(p3,'50',p4,0)) b_amt,
          sum(decode(p3,'10',p4,0)) r_amt,
          sum(decode(p3,'20',p4,0)) d_amt,
          sum(decode(p3,'40',p4,0)) l_amt,
          0 pay_amt,
          0 o_amt,
          0 g_amt,
          0 ot_amt
   FROM table1 t1
   where p1_num = passed_parameter  -- Parameter passed to the cursor
         AND to_char(p2_date, 'mmyyyy')  =  V_pdate  -- V_pdate is a parameter passed to the procedure
         group by p1_num, p2_date
   UNION
   select p1_num,
          p6_date,
          0,
          0,
          0,
          0,
          sum(decode(p7,'2', p8,0)) pay_amt,
          0 o_amt,
          0 g_amt,
          0 ot_amt
   from table2 t2
   where  p1_num = passed_parameter  -- Parameter passed to the cursor
          AND to_char(p6_date, 'mmyyyy')  =  V_pdate  -- V_pdate is a parameter passed to the procedure
          group by p1_num, p6_date
   UNION
   select p1_num,
          p6_date,
          0,
          0,
          0,
          0,
          0 pay_amt,
          sum(decode(substr(p9,1,1),'1',p8,0)) oil_amt,
          sum(decode(substr(p9,1,1),'2',p8,0)) gas_amt,
          sum(decode(substr(p9,1,1),'5',p8,'3',p8,'4',p8,0)) ot_amt
   from table2 t2
   where ((p7 IS NULL) OR (p7 IN ('0','1','3','4')))
         and p1_num = passed_parameter  -- Parameter passed to the cursor
         AND to_char(p6_date, 'mmyyyy')  =  V_pdate  -- V_pdate is a parameter passed to the procedure
         group by p1_num, p6_date;
         I need to add a condition <b>p5 = '1'</b> to filter the results of this query. p5 is a from table1. I tried using inner join, as per Jane's suggestion, something like this:
  select t1.p1_num,
          t1.p2_date,
           sum(decode(p3,'50',p4,0)) b_amt,
          sum(decode(p3,'10',p4,0)) r_amt,
          sum(decode(p3,'20',p4,0)) d_amt,
          sum(decode(p3,'40',p4,0)) l_amt,
           sum(decode(p7,'2', p8,0)) pay_amt,
          sum(decode(substr(p9,1,1),'1',p8,0)) oil_amt,
          sum(decode(substr(p9,1,1),'2',p8,0)) gas_amt,
          sum(decode(substr(p9,1,1),'5',p8,'3',p8,'4',p8,0)) ot_amt
   FROM  table2 t2 inner join table1 t1
   on t2.p1_num = t1.p1_num
   WHERE
   to_char(t1.p6_date,'mmyyyy') = V_pdate
   and   t1.p5 = '1'
   and  ((t2.p7 IS NULL) OR (t2.p7 IN ('0','1','3','4')))
   group by t1.p1_num, t1.p2_date
   order by t1.p1_num
   Firstly, I get duplicates for some of the records, which I need to eliminate. Once I eliminate those, i'll know if my retrieved records are right (since right now its retrieving more than 1000 records!)