Running total by grouped records in table

Question

I have a table like this (Oracle, 10)

Account     Bookdate     Amount
      1     20080101        100
      1     20080102        101
      2     20080102        200
      1     20080103       -200
...

What I need is new table grouped by Account order by Account asc and Bookdate asc with a running total field, like this:

Account     Bookdate     Amount     Running_total
      1     20080101        100               100
      1     20080102        101               201
      1     20080103       -200                 1
      2     20080102        200               200
...

Is there a simple way to do it?

Thanks in advance.

Answer 1

Do you really need the extra table?

You can get that data you need with a simple query, which you can obviously create as a view if you want it to appear like a table.

This will get you the data you are looking for:

select 
    account, bookdate, amount, 
    sum(amount) over (partition by account order by bookdate) running_total
from t
/

This will create a view to show you the data as if it were a table:

create or replace view t2
as
select 
    account, bookdate, amount, 
    sum(amount) over (partition by account order by bookdate) running_total 
from t
/

If you really need the table, do you mean that you need it constantly updated? or just a one off? Obviously if it's a one off you can just "create table as select" using the above query.

Test data I used is:

create table t(account number, bookdate date, amount number);

insert into t(account, bookdate, amount) values (1, to_date('20080101', 'yyyymmdd'), 100);

insert into t(account, bookdate, amount) values (1, to_date('20080102', 'yyyymmdd'), 101);

insert into t(account, bookdate, amount) values (1, to_date('20080103', 'yyyymmdd'), -200);

insert into t(account, bookdate, amount) values (2, to_date('20080102', 'yyyymmdd'), 200);

commit;

edit:

forgot to add; you specified that you wanted the table to be ordered - this doesn't really make sense, and makes me think that you really mean that you wanted the query/view - ordering is a result of the query you execute, not something that's inherant in the table (ignoring Index Organised Tables and the like).