Select multiple summations for different where clauses

Question

Hello,
I have table with invoice amounts of an article stored per period per year.
The table looks like this:
YEAR number(4) #pk
PERIOD number(2) #pk
ART number(12) #pk
AMOUNT number(10,2)
Suppose i have stored following info
YEAR PERIOD ART AMOUNT
2001 11 455 100.00
2001 12 455 150.00
2002 1 455 300.00
2002 2 455 200.00
2002 12 455 700.00
2003 1 455 220.00
I want to select the total amounts per article per year
and the total amounts per article per previous years
in ONE SELECT statement
When performing the follwing select i dont get the right information:
select a.year
, a.art
, sum(a.amt) year_amt
, nvl(sum(b.amt)) previous_years_amt
from app_inv a
, app_inv b
where b.YEAR (+) <= ( a.year - 1 )
and b.ART (+) = b.art
group
by a.year
, a.art
Results in:
YEAR ART YEAR_AMT PREVIOUS_YEARS_AMT
2001 455 250 0
2002 455 2400 750
2003 455 1100 1450
But i expected
YEAR ART YEAR_AMT PREVIOUS_YEARS_AMT
2001 455 250 0
2002 455 1200 250
2003 455 220 1450
The cause is a cartesian product because i omit the
column PERIOD, but adding that extra where
(b.PERIOD (+) = a.period) isn't also succesful:
YEAR ART YEAR_AMT PREVIOUS_YEARS_AMT
2001 455 250 0
2002 455 1200 150
2003 455 220 300
Does anyone know how format this into 1 select statement resulting in on record per year per article.
Thanks in advance
Auke Quist.

Answer 1

Thanks, your select works, but just for one article
When storing multiple articles over multiple years/periods
i don't get the expected result.
create table app_inv
( YEAR number(4) not null
, PERIOD number(2) not null
, ART number(12) not null
, AMOUNT number(10,2) not null
delete app_inv
insert into app_inv values ( 2001, 11, 455, 100.00 )
insert into app_inv values ( 2001, 12, 455, 150.00 )
insert into app_inv values ( 2002, 1, 455, 300.00 )
insert into app_inv values ( 2002, 2, 455, 200.00 )
insert into app_inv values ( 2002, 12, 455, 700.00 )
insert into app_inv values ( 2003, 1, 455, 220.00 )
insert into app_inv values ( 2001, 10, 475, 100.00 )
insert into app_inv values ( 2001, 11, 475, 150.00 )
insert into app_inv values ( 2002, 3, 475, 300.00 )
insert into app_inv values ( 2002, 4, 475, 200.00 )
insert into app_inv values ( 2002, 5, 465, 700.00 )
insert into app_inv values ( 2003, 1, 475, 220.00 )
Prompt select statement works for 1 article
SELECT a.year
, a.art
, sum(a.amount) year_amt
, sum(sum(a.amount))
OVER (ORDER by a.year, a.art ROWS UNBOUNDED PRECEDING)
- sum(a.amount) AS previous_years_amt
FROM app_inv a
WHERE a.art=455
GROUP BY a.year
, a.art
order by a.art
Prompt select statement fails for more than 1 article
SELECT a.year
, a.art
, sum(a.amount) year_amt
, sum(sum(a.amount))
OVER (ORDER by a.year, a.art ROWS UNBOUNDED PRECEDING)
- sum(a.amount) AS previous_years_amt
FROM app_inv a
GROUP BY a.year
, a.art
order by a.art
Are you able to help me further on, or anyone else?
Note i'm using 8.1.7.1.1 RDBMS
Thanks in advance
Auke Quist