----- Mensaje original -----
> De: "Olivier Leprêtre" <o.lepretre@gmail.com>
> Para: pgsql-sql@lists.postgresql.org
> Enviados: Miércoles, 13 de Junio 2018 11:33:50
> Asunto: Window ?
> Hi,
>
>
>
> I have a road segment table with a few attributes for each. For each
> segment, I have a road index and a segment index something like :
>
>
>
> road seg colA
>
> 1 1 att1
>
> 1 2 att2
>
> 1 3 att3
>
> 1 4 att4
>
> 2 1 att5
>
> 2 2 att6
>
>
>
> I want to convert records into lines,
>
>
>
> 1 att1 att2 att3 att4
>
> 2 att5 att6 ...
>
>
Looks like a solution with "pivot":
https://www.postgresql.org/docs/current/static/tablefunc.html
Look for "crosstab" functions.
HTH
Gerardo