Re: Obtener columna de totales

[Jaime Casanova]

On Tue, 16 Oct 2018 at 19:30, Anthony Sotolongo <asotolo...@gmail.com> wrote:
>
> Hola Jorge, puedes utilizar las funciones 
> ventanas(https://www.postgresql.org/docs/10/static/functions-window.html), 
> algo como esto, debes ajustarlo a tu escenario:
>
> with a as (
> select row_number() over ()as id, id_tip_mov,mto_can, case id_tip_mov
>     when 2 then 0-mto_can
>     else
>     mto_can
> end as valor
>  from (select * from  (VALUES (1, 100), (1, 300),(2, 6),(2, 4),(1,7)) AS t 
> (id_tip_mov,mto_can)) sub)
>
>  select id_tip_mov,mto_can,sum (valor) over (order by id  rows between 
> unbounded preceding and current row) from a
>

me parece que te estas complicando de mas, el WITH no lo necesitas.
debería bastar con:

select fec_emi, id_tip_mov, mto_can,
          sum(case when id_tip_mov = 1 then mto_can else mto_can*(-1) end)
                 over (order by fec_emi rows between unbounded
preceding and current row)  mto_tot
from mov;

-- 
Jaime Casanova                      www.2ndQuadrant.com
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services