SQL query with dates

Question

WITH tab AS
(select '1' id1, '2' id2,'30-04-2009' Date1,'102' amount from dual union all
select '1' id1 , '1' id2,'15-04-2009' Date1, '100' amount from dual union all
select '1' id1, '1' id2,'16-04-2009' Date1, '200' amount from dual union all
select '2' id1, '1' id2, '01-05-2009' Date1, '150' amount from dual union all
select '2' id1, '1' id2,'30-06-2009' Date1, '110' amount from dual
select * from tab;
WITH union_data AS
(select '1' no,'01-04-2009' from_Date1,'30-04-2009' to_date from dual union all
select '2' no ,'01-05-2009' from_Date1,'31-05-2009' to_date from dual union all
select '3' no, '01-06-2009' from_Date1,'30-06-2009' to_date from dual union all
select '4' no, '01-07-2009' from_Date1,'31-07-2009' to_date from dual
select * from union_data;
i need a query to sum the amout which falls on the particular from_date and to_date.here in the above case with id1 and id2 as primary key
from the table tab date1 for the first row is 30-04-2009 which falls in the no - 1 in the second table
from the table tab date1 for the second row is 15-04-2009 which again falls in the no - 1 in the second table
from the table tab date1 for the third row is 16-04-2009 which again falls in the no - 1 in the second table
from the table tab date1 for the fourth row is 01-05-2009 which falls in the no - 2 in the second table
from the table tab date1 for the fourth row is 30-06-2009 which falls in the no - 3 in the second table
so the output should as below which should be return as rows which the table will be the following rows
id1,id2,no1_amnt,no2_amnt,no3_amnt,no4_amnt,no5_amnt
WITH result AS
(select '1' id1,'2' id2,'102' no1_amnt,'null' no2_amnt,'null' no3_amnt,'null' no4_amnt,'null' no5_amnt from dual union all
select '2' id1,'1' id2,'null' no1_amnt,'150' no2_amnt,'110' no3_amnt,'null' no4_amnt,'null' no5_amnt from dual union all
select '1' id1,'1' id2,'300' no1_amnt,'null' no2_amnt,'null' no3_amnt,'null' no4_amnt,'null' no5_amnt from dual
select * from result;
The above result as the first table got 3 combination of primary key id1 and id2. and then looked up in the second table from_date and to_date and sum up the amount.
Please help to get the query

Answer 1

Posting late as the forum was not working some time back :(
WITH tab AS
select '1' id1, '2' id2,to_date('30-04-2009','dd-mm-yyyy') Date1,'102' amount from dual
union all
select '1' id1 , '1' id2,to_date('15-04-2009','dd-mm-yyyy') Date1, '100' amount from dual
union all
select '1' id1, '1' id2,to_date('16-04-2009','dd-mm-yyyy') Date1, '200' amount from dual
union all
select '2' id1, '1' id2, to_date('01-05-2009','dd-mm-yyyy') Date1, '150' amount from dual
union all
select '2' id1, '1' id2,to_date('30-06-2009','dd-mm-yyyy') Date1, '110' amount from dual
union_data AS
select '1' no,to_date('01-04-2009','dd-mm-yyyy') from_Date1,to_date('30-04-2009','dd-mm-yyyy') to_date1 from dual
union all
select '2' no ,to_date('01-05-2009','dd-mm-yyyy') from_Date1,to_date('31-05-2009','dd-mm-yyyy') to_date1 from dual
union all
select '3' no, to_date('01-06-2009','dd-mm-yyyy') from_Date1,to_date('30-06-2009','dd-mm-yyyy') to_date1 from dual
union all
select '4' no, to_date('01-07-2009','dd-mm-yyyy') from_Date1,to_date('31-07-2009','dd-mm-yyyy') to_date1 from dual
select id1, id2, max(decode(no,1,amount)) no1, max(decode(no,2,amount)) no2, max(decode(no,3,amount)) no3, max(decode(no,4,amount)) no4, max(decode(no,5,amount)) no5
  from (
select a.id1, a.id2, b.no, sum(a.amount) amount
  from tab a
  join union_data b
    on a.date1 between b.from_date1 and b.to_date1
group by id1, id2, no)
group by id1, id2