George McQuade wrote:
> date tran gl amt
> 08/20/03 1001 3010 -30.00
> 08/20/03 1001 1030 -300.00
> 08/20/03 1001 1060 +330.00
> 08/20/03 1002 ...next transaction
> ...
> and I need to convert to:
>
> date glcr gldb amt
> 08/20/03 1060 3010 30.00
> 08/20/03 1060 1030 300.00
>
> in other words, the negative gl's go into gldb
> and they make up the total for the positive gl.
>
> is there a way to accomplish this in postgresql?
> or should I implement it inside the java app?
There's no simple way to do this in Postgres. You could do it with a
PL/pgSQL table function, or for better performance a C function. There
are a couple of questions yet to be answered though:
1) Can there ever be more than one credit account, e.g. -30, -300, +150, +180?
2) What happens if sum(neg values) != sum(pos values)? Throw an error?
Joe