> There is an easy way to do this; write a plpgsql set returning
> function which adds the balance to the last column of the table. That
> query will always have a cost in both time and memory proportional to
> the size of the table, and the memory cost may bite you as table size
> grows...
> --
Can you give me some example function which adds the balance to the last
column of the table.
Thanks.