Oracle sum question

Having table TestTB (dates in dd-mm-yyyy)


I need A Select Sum pr. month-Year - summarized (Balance)

A;02-2012;4         (that is 3 from 01 and 1 from 02)
C;02-2012;-2       (that is -5 from 01 and 3 from 02)

I use Oracle 10g
Who is Participating?

[Product update] Infrastructure Analysis Tool is now available with Business Accounts.Learn More

I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

slightwv (䄆 Netminder) Commented:
I don't see how you get itemA numbers but based on what I think you want, something like:  

select item, to_char(date_col,'MM-YYYY'), sum(qty) from table
group by item, to_char(date_col,'MM-YYYY');
VinumAuthor Commented:

It is not just a sum pr. month - it is a balance.

Example with item A:
The sum/balance for 01-2012 is 3 (5 and -2)
The sum/balance for 02-2012 is 4 (1 for month 02 and 3 for months 01)

The idea is to make a balance over time.
Another example:
I have 5 of X on stock.
In January I sell 2, balance in the end of January is 3 (5-2)
In February I sell 1 and buy 10, balance at the end of February is 12 (5-2-1+10)
In March I sell 5, balance at the end of March i 7 (5-2-1+10-5)
and so on....

Robert SchuttSoftware EngineerCommented:
I think you can only do that with a subselect:

select distinct tb1.item, 
   to_char(tb1.dat, 'mm-yyyy') per, 
   (select sum(qty) 
    from testtb tb2 
    where tb2.item = tb1.item and 
      to_char(tb2.dat, 'yyyymm') <= to_char(tb1.dat, 'yyyymm')) balance 
from testtb tb1 
group by tb1.item, tb1.dat 
order by tb1.item, per;

Open in new window

SujithData ArchitectCommented:
See the below, combine a group by with analytical function -
SQL> select *
  2  from tbl1;

ITEM                 DT                 QTY
-------------------- ----------- ----------
A                    12-jan-2012          5
A                    27-jan-2012         -2
A                    04-feb-2012          1
B                    08-nov-2011         -1
B                    08-nov-2011          3
B                    15-nov-2011          7
C                    17-jan-2012         -5
C                    25-feb-2012          3

8 rows selected.

SQL> select item, dt month, sum(qty) over( partition by item order by to_date(dt, 'mm-yyyy')) balance
  2  from (
  3  select item, to_char(dt, 'mm-yyyy') dt, sum(qty) qty
  4  from tbl1
  5  group by item, to_char(dt, 'mm-yyyy')
  6  )
  7  order by 1,2;

ITEM                 MONTH      BALANCE
-------------------- ------- ----------
A                    01-2012          3
A                    02-2012          4
B                    11-2011          9
C                    01-2012         -5
C                    02-2012         -2


Open in new window

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
Oracle Database

From novice to tech pro — start learning today.