Need help - sql query

Question

Hi,
     I have two tables(production & sales). I want to generate monthly statement. The followings are the sample data.
PRODUCTION:
DATE          MATERIAL     WEIGHT      AMOUNT
01/12/2008     Item1     300     6000
03/12/2008     item2          250      3500
07/12/2008     item3          700     6500
12/12/2008     item1          200     4000
20/12/2008     item3          400     9600
25/12/2008     item1          250     5000
Sales:
SAL_Date          Sal_Material     sal_weight     SAL_Amount
12/12/2008     item3          270     2300
15/12/2008     item1          200     4000
20/12/2008     item2          250     3500
20/12/2008     item1          100     2000
23/12/2008     item1          100     2000
27/12/2008     item3          200     3500
I want to generate monthly statement like the following....
Required Report:
Date          Production          Sales
          Weight - Amount      Weight - Amount          
01/12/2008     300     6000          0     0
02/12/2008     0     0     0     0
03/12/2008     250     3500          0     0           
04/12/2008     0 0 0 0
07/12/2008     700 6500 0 0
12/12/2008     200     4000     270 2300
31/12/2008 0 0 0 0
i don't know, how to generate sequential date...
Could you please tell me the query?
Thanks & Regards

Answer 1

SQL> with prod
  2  as
  3  (
  4     select to_date('01/12/2008','dd/mm/yyyy') dt, 'Item1' material, 300 weight, 6000 amount from dual union all
  5     select to_date('03/12/2008','dd/mm/yyyy'), 'item2', 250, 3500 from dual union all
  6     select to_date('07/12/2008','dd/mm/yyyy'), 'item3', 700, 6500 from dual union all
  7     select to_date('12/12/2008','dd/mm/yyyy'), 'item1', 200, 4000 from dual union all
  8     select to_date('20/12/2008','dd/mm/yyyy'), 'item3', 400, 9600 from dual union all
  9     select to_date('25/12/2008','dd/mm/yyyy'), 'item1', 250, 5000 from dual
10  ), sales
11  as
12  (
13     select to_date('12/12/2008','dd/mm/yyyy') dt, 'item3' material, 270 weight, 2300 amount from dual union all
14     select to_date('15/12/2008','dd/mm/yyyy'), 'item1', 200, 4000 from dual union all
15     select to_date('20/12/2008','dd/mm/yyyy'), 'item2', 250, 3500 from dual union all
16     select to_date('20/12/2008','dd/mm/yyyy'), 'item1', 100, 2000 from dual union all
17     select to_date('23/12/2008','dd/mm/yyyy'), 'item1', 100, 2000 from dual union all
18     select to_date('27/12/2008','dd/mm/yyyy'), 'item3', 200, 3500 from dual
19  ),find_date
20  as
21  (
22     select dt st, last_day(dt) ed
23       from (select distinct trunc(dt,'month') dt from prod
24             union
25             select distinct trunc(dt,'month') dt from sales)
26  ),day_list
27  as
28  (
29     select (level-1)+st dt
30       from find_date
31     connect by level <= (ed - st)+1
32  )
33  select d.dt, t.p_weight, t.p_amount, t.s_weight, t.s_amount
34    from day_list d
35    left join
36         (select decode(p.dt,null,s.dt,p.dt) dt,
37                    sum(p.weight) p_weight, sum(p.amount) p_amount, sum(s.weight) s_weight, sum(s.amount) s_amount
38            from prod p
39            full outer join sales s
40              on p.dt = s.dt
41             and p.material = s.material
42           group by decode(p.dt,null,s.dt,p.dt)) t
43      on d.dt = t.dt
44  order by d.dt
45  /
DT          P_WEIGHT   P_AMOUNT   S_WEIGHT   S_AMOUNT
01-DEC-08        300       6000
02-DEC-08
03-DEC-08        250       3500
04-DEC-08
05-DEC-08
06-DEC-08
07-DEC-08        700       6500
08-DEC-08
09-DEC-08
10-DEC-08
11-DEC-08
DT          P_WEIGHT   P_AMOUNT   S_WEIGHT   S_AMOUNT
12-DEC-08        200       4000        270       2300
13-DEC-08
14-DEC-08
15-DEC-08                              200       4000
16-DEC-08
17-DEC-08
18-DEC-08
19-DEC-08
20-DEC-08        400       9600        350       5500
21-DEC-08
22-DEC-08
DT          P_WEIGHT   P_AMOUNT   S_WEIGHT   S_AMOUNT
23-DEC-08                              100       2000
24-DEC-08
25-DEC-08        250       5000
26-DEC-08
27-DEC-08                              200       3500
28-DEC-08
29-DEC-08
30-DEC-08
31-DEC-08
31 rows selected.