How to use decode to calculate sum for different date range

Question

I'm stuck with decode() function:
I have a table like this:
(project_id, approve_date, value, builder_code)
I want to write a SQL query to get sum of values for different month of the approve_date, and group by builder_code)
The result is like this:
builder_code Sum(value)_Sep-03 Sum(value)_Oct-03 Sum(value)_Nov03
1001 1,299 1,322 990
1002 3,332 1,222 333
I tried to use decode for this question but could not get the answer.
Thanks a lot

Answer 1

I don't think you need a DECODE() here. I'd do something like this-
create table builder (
    project_id number,
    approve_date date,
    value        number,
    builder_code number
insert into builder values( 1, to_date('09-01-2003', 'MM-DD-YYYY'), 100, 990 )
insert into builder values( 2, to_date('09-03-2003', 'MM-DD-YYYY'), 150, 990 )
insert into builder values( 3, to_date('09-05-2003', 'MM-DD-YYYY'), 250, 990 )
insert into builder values( 3, to_date('09-05-2003', 'MM-DD-YYYY'), 250, 333)
SELECT sept.builder_code, sept.sept_sum, oct.oct_sum
FROM (SELECT builder_code, sum(value) sept_sum
        FROM builder
       WHERE approve_date >= to_date('09-01-2003','MM-DD-YYYY')
         AND approve_date < to_date('10-01-2003','MM-DD-YYYY')
       GROUP BY builder_code) sept,
     (SELECT builder_code, sum(value) oct_sum
        FROM builder
       WHERE approve_date >= to_date('10-01-2003','MM-DD-YYYY')
         AND approve_date < to_date('11-01-2003','MM-DD-YYYY')
       GROUP BY builder_code) oct
WHERE oct.builder_code(+) = sept.builder_code
BUILDER_CODE   SEPT_SUM    OCT_SUM
         333        250
         990        500Justin
Distributed Database Consulting, Inc.
www.ddbcinc.com/askDDBC